Abstract:
The embodiments disclose a plasmonic cladding structure including at least one conformal plasmonic cladding structure wrapped around plural stack features of a recording device, wherein the conformal plasmonic cladding structure is configured to create a near-field transducer in close proximity to a recording head of the recording device, at least one conformal plasmonic cladding structure with substantially removed top surfaces of the stack features with exposed magnetic layer materials and a thermally insulating filler configured to be located between the stack features.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims the benefit of U.S. Provisional Patent Application Ser. No. 61/844,420 filed Jul. 9, 2013, entitled “A METHOD OF FABRICATING BPM PATTERNED HAMR MEDIA WITH PLASMONIC CLADDING”, by Ju, et al. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
       [0002]      FIG. 1  shows a block diagram of an overview of a method for fabricating plasmonic cladding of one embodiment. 
         [0003]      FIG. 2  shows a block diagram of an overview flow chart of a method for fabricating plasmonic cladding of one embodiment. 
         [0004]      FIG. 3  shows a block diagram of an overview flow chart of a conformal plasmonic cladding layer deposition of one embodiment. 
         [0005]      FIG. 4  shows a block diagram of an overview flow chart of partially etching the conformal plasmonic cladding layer of one embodiment. 
         [0006]      FIG. 5  shows a block diagram of an overview flow chart of improving NFT-media coupling efficiency of one embodiment. 
         [0007]      FIG. 6A  shows for illustrative purposes only an example of a HAMR stack of one embodiment. 
         [0008]      FIG. 6B  shows for illustrative purposes only an example of etching a BPM first magnetic recording pattern of one embodiment. 
         [0009]      FIG. 6C  shows for illustrative purposes only an example of etching a BPM second magnetic recording pattern of one embodiment. 
         [0010]      FIG. 7A  shows for illustrative purposes only an example of a first BPM patterned feature of one embodiment. 
         [0011]      FIG. 7B  shows for illustrative purposes only an example of a second BPM patterned feature of one embodiment. 
         [0012]      FIG. 8A  shows for illustrative purposes only an example of first conformal plasmonic cladding of one embodiment. 
         [0013]      FIG. 8B  shows for illustrative purposes only an example of second conformal plasmonic cladding of one embodiment. 
         [0014]      FIG. 9A  shows for illustrative purposes only an example of etching first conformal plasmonic cladding layer in the BPM feature trenches of one embodiment. 
         [0015]      FIG. 9B  shows for illustrative purposes only an example of etching second conformal plasmonic cladding layer in the BPM feature trenches of one embodiment. 
         [0016]      FIG. 10A  shows for illustrative purposes only an example of partially etched first conformal plasmonic cladding down to the IL &amp; TR layer of one embodiment. 
         [0017]      FIG. 10B  shows for illustrative purposes only an example of partially etched second conformal plasmonic cladding down to HS2 of one embodiment. 
         [0018]      FIG. 11A  shows for illustrative purposes only an example of a first thermally insulating filler deposition of one embodiment. 
         [0019]      FIG. 11B  shows for illustrative purposes only an example of a second thermally insulating filler deposition of one embodiment. 
         [0020]      FIG. 12A  shows for illustrative purposes only an example of first BPM patterned dot patterned plasmonic cladding of one embodiment. 
         [0021]      FIG. 12B  shows for illustrative purposes only an example of second BPM patterned dot patterned plasmonic cladding of one embodiment. 
         [0022]      FIG. 13  shows for illustrative purposes only an example of avoiding lateral thermal bloom of one embodiment. 
         [0023]      FIG. 14  shows for illustrative purposes only an example of a second BPM patterned feature with wrap around plasmonic cladding of one embodiment. 
         [0024]      FIG. 15  shows for illustrative purposes only an example of a first multi-layer conformal plasmonic cladding layer of one embodiment. 
         [0025]      FIG. 16  shows for illustrative purposes only an example of a second multi-layer conformal plasmonic cladding layer of one embodiment. 
         [0026]      FIG. 17  shows for illustrative purposes only an example of directional vertical etching of one embodiment. 
         [0027]      FIG. 18  shows for illustrative purposes only an example of patterned BPM feature multi-layer plasmonic cladding wrap of one embodiment. 
     
    
     DETAILED DESCRIPTION 
       [0028]    In a following description, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration a specific example in which the embodiments may be practiced. It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the scope. 
       General Overview: 
       [0029]    It should be noted that the descriptions that follow, for example, in terms of a method for fabricating plasmonic cladding is described for illustrative purposes and the underlying system can apply to any number and multiple types of magnetic recording patterns. In one embodiment, the method for fabricating plasmonic cladding can be configured using one or more layers of plasmonic cladding materials. The method for fabricating plasmonic cladding can be configured to include two or more thermally gradient heat sink layers and can be configured to include two or more anisotropic gradient magnetic layers. 
         [0030]      FIG. 1  shows a block diagram of an overview of a method for fabricating plasmonic cladding of one embodiment.  FIG. 1  shows a fabrication process including depositing two or more heat sink layers onto a substrate  100 . The processing includes depositing a thin inter-layer and thermal resistor layer on the top heat sink layer  110 . The fabrication continues by depositing two or more magnetic layers onto thin inter-layer and thermal resistor layer  120 . Partially etching a bit patterned media (BPM) pattern  130  into the stacked layers creates bit patterned media features. The process continues with depositing one or more conformal plasmonic cladding layer onto bit patterned media features  140 . A patterning process includes partially etching the one or more conformal plasmonic cladding layer (PCL)  160  to pattern the PCL. The patterned PCL is insulated by depositing a thermally insulating filler between BPM features  150  of one embodiment. 
         [0031]    A method for fabricating plasmonic cladding is configured to wrap the plasmonic cladding around the patterned bit patterned media features to amplify optical coupling and NFT-media coupling. Typically in a HAMR stack a plasmonic underlayer is positioned between the substrate and a continuous heat sink layer. Moving the plasmonic layer closer to a near field transducer head laser  170  increases efficiency in optical coupling efficiency and reducing near field transducer head laser power  180 , for example to a power level &lt;50 nW at the top surface of a stack feature including a bit patterned media feature, thereby extending the useful life of the NFT of one embodiment. 
       DETAILED DESCRIPTION 
       [0032]    Plasmonic devices use plasmonic materials to efficiently confine optical fields at a nanoscale to locally heat a recording medium for data storage in a heat assisted magnetic recording (HAMR) stack including bit patterned media (BPM). The confining of near field optical effects transmitted from a near field transducer (NFT) including a laser to temporarily heat the magnetic medium to lower the switching field of high-anisotropy, small grain media of one embodiment. 
         [0033]    After the media is written, it cools rapidly (&lt;1 ns) for long-term storage. Because the size, for example the nanoscaled grains of a patterned magnetic layers in a bit patterned media stack, of the region to be heated in the media is well below the optical diffraction limit, a writer must use a near field device such as a plasmonic device made of a low loss metal (gold, silver, copper) for the creation of resonant charge motion at the metal surface of one embodiment. 
         [0034]    Thermal conductivity is the measure of the speed of heat flow passed from particle to particle. The rate of heat flow through a specific material will be influenced by the difference of temperature and by its thermal conductivity. Thermal conductivity is a measure of the capacity of a material to conduct heat through its mass. It can be defined as the amount of heat/energy (expressed in kcal, Btu or J) that can be conducted in unit time through unit area of unit thickness of material, when there is a unit temperature difference. Thermal conductivity is also known as the k-value and can be expressed in the SI system in watt (W) m−1° C-1 of one embodiment. 
         [0035]      FIG. 2  shows a block diagram of an overview flow chart of a method for fabricating plasmonic cladding of one embodiment.  FIG. 2  shows depositing two or more heat sink layers onto a substrate  100  including depositing a continuous first heat sink layer (HS1) onto a substrate  200 . The deposition of HS1 includes using materials with high thermal conductivity with k values from 10 to 400 k/(w m)  210 . Depositing two or more heat sink layers onto a substrate  100  includes depositing at least one gradient second heat sink layer (HS2) onto HS1  220  of one embodiment. 
         [0036]    The deposition of at least one gradient second heat sink layer includes using materials with low thermal conductivity with k values from 0.1 to 30 k/(w m)  230 . Depositing at least one gradient second heat sink layer includes using materials including copper alloys including Zirconium (Zr) and nickel (Ni) alloys, molybdenum (Mo) alloys, tungsten (W) alloys and Ruthenium (Ru) alloys  240  and includes a thickness from 0.1 to 20 nm  250 . The fabrication process includes depositing a thin inter-layer and thermal resistor layer on the top heat sink layer  110  to a thickness from 1 to 15 nm  260 . Description of the fabrication process continues on  FIG. 3  of one embodiment. 
         [0037]      FIG. 3  shows a block diagram of an overview flow chart of a conformal plasmonic cladding layer deposition of one embodiment.  FIG. 3  shows a continuation from  FIG. 2  including the deposition of the thin inter-layer and thermal resistor layer including using materials including  350  magnesium oxide (MgO)  360 , titanium nitride (TiN) alloys  370  and other thermal resistive materials  380  including magnesium oxide alloys (MgO—X) where alloys (X) include silicon (Si), niobium (Nb), tungsten (W), titanium (Ti), tantalum (Ta) and other alloys and including Titanium nitride alloys (TiN—Y) where alloys (Y) include aluminum (Al), ruthenium (Ru), silicon (Si), oxygen (O), silver (Ag), gold (Au) and other alloys  390 . 
         [0038]    The fabrication continues with a deposition process including depositing two or more magnetic layers onto thin inter-layer and thermal resistor layer  120  with a thickness from 1 to 15 nm  300 . The deposition of the magnetic layers includes using ferromagnetic materials including iron-platinum (FePt) and FePtX alloys where X is an alloy  310 . The deposition of the magnetic layers includes using materials with high anisotropy magnetic where the crystalline anisotropy constants are at or above 7×10 7  erg/cm 3 320 . The fabrication includes etching a bit patterned media (BPM) pattern  130 . Etching a bit patterned media (BPM) pattern  130  includes a first BPM etch down to the thin inter-layer and thermal resistor layer  330  and alternatively a second BPM etch down to the top heat sink layer  340 . Process continuation is described in  FIG. 4  of one embodiment. 
         [0039]      FIG. 4  shows a block diagram of an overview flow chart of partially etching the conformal plasmonic cladding layer of one embodiment.  FIG. 4  shows processing continuing from  FIG. 3  including depositing one or more conformal plasmonic cladding layer onto bit patterned media features  140  includes using a first atomic layer deposition (ALD1)  420 . The conformal plasmonic cladding layer depositions includes using materials including  430  gold (Au)  432 , silver (Ag)  434 , copper (Cu)  436 , aluminum (Al)  438  or the alloys of Au, Cu, Ag and Al  440 . The conformal plasmonic cladding layer depositions includes using other materials with optical constant n&lt;=1 and k&gt;=2.5  450  of one embodiment. 
         [0040]    Fabrication continues including alternately partially etching the conformal plasmonic cladding layer (PCL)  160 . Partially etching the conformal plasmonic cladding layer includes a first PCL etch in the BPM feature trenches  400 , a second PCL etch on top of the BPM features  410  and a third PCL etch combining the first and second etch  415 . The etching is patterning the one or more conformal plasmonic cladding layer (PCL)  417 . Depositing a thermally insulating filler between BPM features  150  surrounds the conformal plasmonic cladding which is wrapped around the BPM features. Insulating the conformal plasmonic cladding wrapped around the BPM features retains heat in the magnetic layers. Processing includes depositing a thermally insulating filler between BPM features  150 . Further descriptions are shown in  FIG. 5  of one embodiment. 
         [0041]      FIG. 5  shows a block diagram of an overview flow chart of improving NFT-media coupling efficiency of one embodiment.  FIG. 5  shows a continuation from  FIG. 4  and includes using a second atomic layer deposition (ALD2)  560  for the deposition of the thermally insulating filler including using materials including  570  silicon dioxide (SiO2)  572 , hafnium(IV) oxide (HfO2)  574 , silicon mononitride (SiN)  576 , aluminum oxide (Al2O3)  578  and other insulating materials  580 . Depositing one or more conformal plasmonic cladding layer onto bit patterned media features  140  of  FIG. 1  is moving the plasmonic layer closer to a near field transducer head laser  170  and reducing near field transducer head laser power  180  of one embodiment. 
         [0042]    Depositing one or more conformal plasmonic cladding layer onto bit patterned media features  140  of  FIG. 1  is improving optical coupling efficiency  500  and improving NFT-media coupling efficiency  510 . The method for fabricating plasmonic cladding moves the plasmonic layer closer to a near field transducer (NFT) to efficiently confine an optical source used to heat patterned features in the HAMR stack including bit patterned media features. Partially etching the conformal plasmonic cladding layer enables deposition of a thicker inter-layer and thermal resistor layer or multilayer inter-layer and thermal resistor layers to keep the heat in the magnetic layer, thus reducing laser power requirement  520 . Thermal conductivity with the gradient of thermal conductivity from low to high  530  created by etching the BPM pattern down to the continuous first heat sink layer  540  avoids lateral thermal bloom  550  of one embodiment. 
         [0043]      FIG. 6A  shows for illustrative purposes only an example of a HAMR stack of one embodiment.  FIG. 6A  shows a heat assisted magnetic recording (HAMR) stack. The method for fabricating plasmonic cladding includes the HAMR stack  655  including a substrate  600 . The HAMR stack  655  substrate  600  shows depositions thereon including a heat sink 1 (HS1)  610 , a heat sink 2 (HS2)  620 , thin interlayer and thermal resistor layer (IL &amp; TR layer)  630 , a magnetic layer 1 (MAG 1)  640  and a magnetic layer 2 (MAG 2)  650  of one embodiment. 
         [0044]      FIG. 6B  shows for illustrative purposes only an example of etching a first BPM magnetic recording pattern of one embodiment.  FIG. 6B  shows the HAMR stack  655  of  FIG. 6A  including the substrate  600 , HS1  612 , HS2  622 , IL &amp; TR layer  632 , MAG 1  642  and MAG 2  652 . Etching a first BPM magnetic recording pattern  660  includes a first BPM magnetic recording pattern  670  down to the thin inter-layer and thermal resistor layer  330  of  FIG. 3  of one embodiment. 
         [0045]      FIG. 6C  shows for illustrative purposes only an example of etching a BPM second magnetic recording pattern of one embodiment.  FIG. 6C  shows the substrate  600 , HS1  612 , HS2  622 , IL &amp; TR layer  632 , MAG 1  642  and MAG 2  652 .  FIG. 6C  shows etching a second BPM magnetic recording pattern  680  including a second BPM magnetic recording pattern  675  down to the top heat sink layer  340  of  FIG. 3  of one embodiment. 
         [0046]      FIG. 7A  shows for illustrative purposes only an example of a first BPM patterned feature of one embodiment.  FIG. 7A  shows the substrate  600  and non-patterned HS1  612 , HS2  622  and IL &amp; TR layer  632 . A first BPM patterned feature (dot)  700  includes a patterned MAG 1  710  and patterned MAG 2  720 . The top surface of the non-patterned IL &amp; TR layer  632  between each first BPM patterned feature (dot)  700  is the trench  730  of one embodiment. 
         [0047]      FIG. 7B  shows for illustrative purposes only an example of a second BPM patterned feature of one embodiment.  FIG. 7B  shows the substrate  600  and non-patterned HS1  612 . A second BPM patterned feature (dot)  740  includes a patterned HS2  760 , patterned IL &amp; TR layer  750  and the patterned MAG 1  710  and patterned MAG 2  720 . The trench  770  of the second BPM patterned feature (dot)  740  is at the surface of the non-patterned HS1  612  of one embodiment. 
         [0048]      FIG. 8A  shows for illustrative purposes only an example of first conformal plasmonic cladding of one embodiment.  FIG. 8A  shows the substrate  600  non-patterned HS1  612 , HS2  622  and IL &amp; TR layer  632 . The first BPM patterned feature (dot)  700  is shown with the patterned MAG 1  710  and patterned MAG 2  720 . An atomic layer deposition (ALD)  800  is used to deposit a first conformal plasmonic cladding  810  on the first BPM patterned feature (dot)  700  and trench  730  of  FIG. 7A  of one embodiment. 
         [0049]      FIG. 8B  shows for illustrative purposes only an example of second conformal plasmonic cladding of one embodiment.  FIG. 8B  shows the HAMR substrate  600  and the continuous HS1  612 . The HAMR etched second BPM patterned feature (dot)  740  includes the patterned HS2  760 , patterned IL &amp; TR layer  750 , patterned MAG 1  710  and patterned MAG 2  720 . The atomic layer deposition (ALD)  800  deposits a second conformal plasmonic cladding  820  over the second BPM patterned feature (dot)  740  and in the trench  770  of  FIG. 7B  of one embodiment. 
         [0050]      FIG. 9A  shows for illustrative purposes only an example of etching first conformal plasmonic cladding layer in the BPM feature trenches of one embodiment.  FIG. 9A  shows the substrate  600 , HS1  612 , HS2  622 , IL &amp; TR layer  632  and the first BPM patterned feature (dot)  700  of  FIG. 7A . The first BPM patterned feature (dot)  700  of  FIG. 7A  includes the patterned MAG 1  710  and patterned MAG 2  720 . The first conformal plasmonic cladding  810  is partially patterned by etching first conformal plasmonic cladding layer in the BPM feature trenches  900 . The etching is in the trench  730  of  FIG. 7A  to the surface of the IL &amp; TR layer  632  of one embodiment. 
         [0051]      FIG. 9B  shows for illustrative purposes only an example of etching second conformal plasmonic cladding layer in the BPM feature trenches of one embodiment.  FIG. 9B  shows the substrate  600 , HS1  612 , patterned HS2  760 , patterned IL &amp; TR layer  750 , patterned MAG 1  710  and patterned MAG 2  720  of the second BPM patterned feature (dot)  740 . Partial patterning of the second conformal plasmonic cladding  820  is done by etching second conformal plasmonic cladding layer in the BPM feature trenches  910 . The etching is made in the trench  770  of  FIG. 7B  of one embodiment. 
         [0052]      FIG. 10A  shows for illustrative purposes only an example of partially etched first conformal plasmonic cladding down to the IL &amp; TR layer of one embodiment.  FIG. 10A  shows the first BPM patterned feature (dot)  700  of  FIG. 7A  including the patterned MAG 1  710  and patterned MAG 2  720 . The HAMR stack shown includes the first BPM patterned feature (dot)  700  of  FIG. 7A , substrate  600 , HS1  612 , HS2  622 , IL &amp; TR layer  632  and partially etched first conformal plasmonic cladding down to the IL &amp; TR layer  1000  of one embodiment. 
         [0053]      FIG. 10B  shows for illustrative purposes only an example of partially etched second conformal plasmonic cladding down to HS2 of one embodiment.  FIG. 10B  shows a HAMR stack including the substrate  600 , HS1  612 , patterned HS2  760 , patterned IL &amp; TR layer  750 , patterned MAG 1  710  and patterned MAG 2  720 . The second BPM patterned feature (dot)  740  includes the partially etched second conformal plasmonic cladding down to HS2  1010  of one embodiment. 
         [0054]      FIG. 11A  shows for illustrative purposes only an example of a first thermally insulating filler deposition of one embodiment.  FIG. 11A  shows the substrate  600 , HS1  612 , HS2  622 , IL &amp; TR layer  632  and first BPM patterned feature (dot)  700  of  FIG. 7A  including the patterned MAG 1  710  and patterned MAG 2  720 . The partially etched first conformal plasmonic cladding down to the IL &amp; TR layer  1000  is shown with a first thermally insulating filler deposition  1100  between the cladded BPM patterned features of one embodiment. 
         [0055]      FIG. 11B  shows for illustrative purposes only an example of a second thermally insulating filler deposition of one embodiment.  FIG. 11B  shows the substrate  600 , HS1  612 , patterned HS2  760 , patterned IL &amp; TR layer  750 , patterned MAG 1  710  and patterned MAG 2  720 . The second BPM patterned feature (dot)  740  of  FIG. 7B  is shown with the partially etched second conformal plasmonic cladding down to HS2  1010  and the second thermally insulating filler deposition  1110  of one embodiment. 
         [0056]      FIG. 12A  shows for illustrative purposes only an example of first BPM patterned dot patterned plasmonic cladding of one embodiment.  FIG. 12A  shows the substrate  600 , HS1  612 , HS2  622 , IL &amp; TR layer  632  and first BPM patterned feature (dot)  700  of  FIG. 7A  including the patterned MAG 1  710  and patterned MAG 2  720 . A partially etched third conformal plasmonic cladding  1200  is made using the third PCL etch combining the first and second etch  415  of  FIG. 4  in the trenches and to the top of the BPM features. The first thermally insulating filler deposition  1100  is shown to the top of the BPM features of one embodiment. 
         [0057]      FIG. 12B  shows for illustrative purposes only an example of second BPM patterned dot patterned plasmonic cladding of one embodiment.  FIG. 12B  shows substrate  600 , HS1  612 , patterned HS2  760 , patterned IL &amp; TR layer  750 , patterned MAG 1  710  and patterned MAG 2  720 . The second BPM patterned feature (dot)  740  of  FIG. 7B  shows a partially etched fourth conformal plasmonic cladding down to heat sink 2 (HS2)  1210 . The partially etched fourth conformal plasmonic cladding down to heat sink 2 (HS2)  1210  is made using the third PCL etch combining the first and second etch  415  of  FIG. 4  in the trenches and to the top of the BPM features. The second thermally insulating filler deposition  1110  to the top of the BPM features of one embodiment. 
         [0058]    Curie temperature (Tc), or Curie point, is the temperature where a material&#39;s permanent magnetism changes to induced magnetism, or vice versa. A rate of the heat flow is determined by the change in temperature (DT) over a period of time (Dt). The period of time can include the time in which external heat is being applied or where two materials in contact reach thermal equilibrium. The heat flow rate is expressed as a ratio DT/Dt where D stands for delta which means change. The force of magnetism is determined by magnetic moments of one embodiment. 
         [0059]      FIG. 13  shows for illustrative purposes only an example of avoiding lateral thermal bloom of one embodiment.  FIG. 13  shows the substrate  600 , HS1  612 , patterned HS2  760 , patterned IL &amp; TR layer  750 , patterned MAG 1  710  and patterned MAG 2  720  of the second BPM patterned feature (dot)  740 . The second BPM patterned feature (dot)  740  includes the partially etched fourth conformal plasmonic cladding down to heat sink 2 (HS2)  1210  and the second thermally insulating filler deposition  1110  of one embodiment. 
         [0060]    A near field transducer (NFT) laser  1300  can for example be a part of a read/write head. The near field transducer (NFT) laser  1300  is a laser power heating source to supply applied optical heat  1310  to the magnetic materials of the second BPM patterned feature (dot)  740  of one embodiment. 
         [0061]    The partially etched fourth conformal plasmonic cladding down to heat sink 2 (HS2)  1210  confines the applied optical heat  1310  to the targeted second patterned BPM feature (dot)  1320  magnetic materials. The second thermally insulating filler deposition  1110  insulates the thermally conductive plasmonic cladding material and assists in retaining the applied optical heat  1310  to the targeted second patterned BPM feature (dot)  1320  magnetic materials. The applied optical heat  1310  is transferred throughout the magnetic materials by heat flow of conducted heat  1330 . The conducted heat  1330  momentarily raises the temperature of patterned MAG 1  710  and patterned MAG 2  720  of the targeted second patterned BPM feature (dot)  1320 . The near field transducer (NFT) laser  1300  continues heating the magnetic materials to a temperature to or above the Curie temperature (Tc) at which point the power to the laser is turned off. The partially etched fourth conformal plasmonic cladding down to heat sink 2 (HS2)  1210  is close to the near field transducer (NFT) laser  1300  and which amplifies coupling of one embodiment. 
         [0062]    The partially etched fourth conformal plasmonic cladding down to heat sink 2 (HS2)  1210  confinement of heat, the insulation of the plasmonic cladding and magnetic materials raises the rate of the heat flow and the temperature of the magnetic materials quickly thereby reducing the time to reach the Tc threshold and thus reduces the power used by the near field transducer (NFT) laser  1300  of one embodiment. 
         [0063]    A write module passes a current through the targeted second patterned BPM feature (dot)  1320  magnetic materials. The heat applied by the near field transducer (NFT) laser  1300  raises the temperature of the magnetic layers to or above the Tc of the magnetic materials. The magnetic materials switching fields vanishes at the Tc of the magnetic materials. The polarity of the targeted second patterned BPM feature (dot)  1320  can shift until the dissipation of the heat gain of the magnetic materials is sufficient to reduce the heated temperature of the targeted second patterned BPM feature (dot)  1320  below its Tc. When the heat introduced by the heating source is dissipated below the Tc or Curie point the magnetic state of the patterned feature is reestablished. The switching fields reappear with the reestablished magnetic state and take on the same polarity of the induced write module current of one embodiment. 
         [0064]    The applied optical heat  1310  conducted through the magnetic materials is dissipated to the patterned IL &amp; TR layer  750  materials. Heat dissipation  1340  continues into the patterned HS2  760  and then into the continuous HS1  612 . The etching of the patterned IL &amp; TR layer  750  and patterned HS2  760  removed the laterally extending materials avoiding the lateral conduction of heat to any adjacent second patterned BPM feature (dot)  1350 . A thermal gradient structure of the patterned IL &amp; TR layer  750  thermal resistive materials, low to medium thermal conductivity materials of the patterned HS2  760  and high thermal conductivity material of the continuous HS1  612  directs the heat dissipation  1340  down to HS1  612  through the targeted second patterned BPM feature (dot)  1320 . The heat is not conducted laterally and thereby avoids lateral thermal bloom  550  of  FIG. 5 . The large mass of HS1  612  and its high thermal conductivity prevents conduction of heat to the low thermal conductivity of the patterned HS2  760  and thermal resistive materials of the patterned IL &amp; TR layer  750  of any adjacent second patterned BPM feature (dot)  1350 . The direction of the heat dissipation  1340  and avoidance of lateral thermal bloom stabilizes the thermal gradient of the HAMR stack  655  of one embodiment. 
         [0065]      FIG. 14  shows for illustrative purposes only an example of a second BPM patterned feature with wrap around plasmonic cladding of one embodiment.  FIG. 14  shows a prospective view of a HAMR stack  655  of  FIG. 6A  with a plurality of second BPM patterned feature (dot)  740  structures including the substrate  600 , HS1  612 , patterned HS2  760 , patterned IL &amp; TR layer  750 , patterned MAG 1  710  and patterned MAG 2  720 . The partially etched fourth conformal plasmonic cladding down to heat sink 2 (HS2)  1210  is shown with the second thermally insulating filler deposition  1110 . The method for fabricating plasmonic cladding is used to create a BPM patterned HAMR media including a plurality of second BPM patterned feature (dot) with wrap around plasmonic cladding  1400  of one embodiment. 
         [0066]      FIG. 15  shows for illustrative purposes only an example of a first multi-layer conformal plasmonic cladding layer of one embodiment.  FIG. 15  shows the substrate  600 , HS1  612 , patterned HS2  760 , patterned IL &amp; TR layer  750 , patterned MAG 1  710  and patterned MAG 2  720 . The second BPM patterned feature (dot)  740  is shown with a first multi-layer conformal plasmonic cladding layer  1500  of a multi-layer plasmonic cladding of one embodiment. 
         [0067]      FIG. 16  shows for illustrative purposes only an example of a second multi-layer conformal plasmonic cladding layer of one embodiment.  FIG. 16  shows the substrate  600 , HS1  612 , patterned HS2  760 , patterned IL &amp; TR layer  750 , patterned MAG 1  710  and patterned MAG 2  720 . The second BPM patterned feature (dot)  740  with the first multi-layer conformal plasmonic cladding layer  1500  includes a second multi-layer conformal plasmonic cladding layer  1600  deposited in the process to fabricate the multi-layer plasmonic cladding of one embodiment. 
         [0068]      FIG. 17  shows for illustrative purposes only an example of directional vertical etching of one embodiment.  FIG. 17  shows the substrate  600 , HS1  612 , patterned HS2  760 , patterned IL &amp; TR layer  750 , patterned MAG 1  710  and patterned MAG 2  720 . The second BPM patterned feature (dot)  740  includes a multi-layer plasmonic cladding patterning using a directional vertical etching  1700  including dry etching and reactive ion beam etching. The directional vertical etching  1700  creates a patterned first multi-layer conformal plasmonic cladding layer  1710  and patterned second multi-layer conformal plasmonic cladding layer  1720  making a patterned BPM feature multi-layer plasmonic cladding wrap  1730  on the plurality of second BPM patterned feature (dot)  740  of one embodiment. 
         [0069]      FIG. 18  shows for illustrative purposes only an example of patterned BPM feature multi-layer plasmonic cladding wrap of one embodiment.  FIG. 18  shows the substrate  600 , HS1  612 , patterned HS2  760 , patterned IL &amp; TR layer  750 , patterned MAG 1  710 , patterned MAG 2  720  and partially etched fourth conformal plasmonic cladding down to heat sink 2 (HS2)  1210  wrapping around the second BPM patterned feature (dot)  740 . The partially etched fourth conformal plasmonic cladding down to heat sink 2 (HS2)  1210  includes the patterned first multi-layer conformal plasmonic cladding layer  1710  and patterned second multi-layer conformal plasmonic cladding layer  1720 . The patterned BPM feature multi-layer plasmonic cladding wrap  1730  is surrounded by a multi-layer plasmonic cladding wrap thermally insulating filler  1800  of one embodiment. 
         [0070]    The foregoing has described the principles, embodiments and modes of operation. However, the invention should not be construed as being limited to the particular embodiments discussed. The above described embodiments should be regarded as illustrative rather than restrictive, and it should be appreciated that variations may be made in those embodiments by workers skilled in the art without departing from the scope as defined by the following claims.