bluuebunny/crossref_metadata_2025_split huggingface dataset:
Magnetic properties of Co/Pt‐Pd multilayer thin film media
Authors: Inaba N. , Igarashi S. , Kirino F. , Fujita F. , Koike K. , Kato H. 
Published: December 2007

AbstractWe investigated the dependence of magnetic properties for Co/Pt100–x Pdx multilayer thin films on the concentration in the Pt‐Pd alloy layers. Perpendicular magneto anisotropy constant Kp increases with increasing Pt concentration in the Pt‐Pd layer, since the interface anisotropy between the Co and the Pt‐Pd layers is enhanced by the increase of the Pt concentration. The Curie temperature and the temperature dependence of Kp for the specimens increase with increasing the amount of Pt in the Pt‐Pd layer. These results may indicate that the lattice distortion of the Co layer caused by the interface from the Pt‐Pd layer becomes larger and the increase of the distortion enhances the interface anisotropy, since the lattice misfit between the Pt‐Pd and the Co increases with increasing the Pt concentration. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Investigation of sputtered tape media with an ultra‐thin magnetic layer
Authors: Lee Hwan‐Soo , Laughlin David E. 
Published: December 2007

AbstractRecording characteristics of underlayers (NiAl/CrMn)/intermediate layer (CoCrTa)/CoCrPtBN thin film media sputter‐deposited on polymeric substrates were investigated as functions of the magnetic layer and the stack thicknesses. Even a very small thickness of 10 nm of the magnetic layer appeared to be sufficient to preserve the in‐plane Hc, and gave rise to the improved recording performances due to primarily the sharper effective head field gradient. The thicknees reduction provided benefits in the fabrication side along with presenting a substantial contribution to the overall recording performance. The overall stack thicknees was reduced down to 70 nm. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Magnetoelastic properties of nanostructured FeCoSiB ribbons used for high‐sensitive stress sensors
Authors: Thang P. D. , Huong Giang D. T. , Tinh B. C. , Danh T. M. , Tuan N. H. , Duc N. H. 
Published: December 2007

AbstractHigh‐sensitive stress sensor is simply constructed comprising magnetostrictive 30 μm‐thick (Fe80Co20)78Si12B10 ribbon acting as a sensitive magnetic core inside an induction coil. The stress can be determined indirectly by measuring the change in the output voltage in the two‐coil system. The results show that the sensitivity highly depends on the intrinsic properties of the ribbon cores. The optimum with both a high sensitivity and an almost linear stress dependence of output signal was obtained in the 250 °C‐annealed ribbon. This is attributed to the correlation between the magnetic and magnetoelastic softness governed by the fine 10 nm nanograin structure. These high sensitivity and simple fabrication sensors are widely applicable to various stress detecting fields. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Magnetic and photocatalytic effect of Fe‐doped nano‐rod ZnO synthesized by the hydrolysis of metal powders
Authors: Uum Y. R. , Han B. S. , Lee H. M. , Hong S. M. , Kim G. M. , Rhee C. K. 
Published: December 2007

AbstractFe‐doped ZnO nano‐rods have been simply synthesized by a hydrolysis method. The starting Zn and Fe nano‐powders were incorporated into distilled water, and then the solution was refluxed at 60 °C for 24 h to obtain the precipitation of hydroxide gel from the hydrolysis of Zn and Fe. Finally the thermal treatment was carried out at 300 °C for 1 h. X‐ray diffraction patterns for all samples exhibited that the resultant precipitates were completely ZnO powder. The TEM result for Fe‐doped ZnO showed rod shape with diameter of 30nm and length of 300nm. With increasing Fe content up to 2 wt.%, the UV‐vis spectra were shifted to the long wave length and this result indicates that the band gap was shifted by Fe‐doping. Whereas the sample with 5wt.% Fe‐doping showed the ferromagnetic behavior at room temperature, the ferromagnetic properties disappeared at the samples with above 5 wt% Fe‐doping. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Investigation of magnetization reversal in chains of permalloy ellipses via magnetoresistance measurement and magnetic force microscopy
Authors: Chao C. T. , Ou J. Y. , Chang Y. C. , Chang C. C. , Lee H. M. , Wu J. C. 
Published: December 2007

AbstractThe magnetization reversal processes of single and chained permalloy thin film ellipses were investigated by using magnetoresistance measurements and magnetic force microscopy. The permalloy ellipses with fixed short axis of 1 micrometer and various long axes of 6, 8, 10 micrometers, respectively, were fabricated by standard electron beam lithography through a lift‐off process. It was found that the switching field increases with increasing the long axis of the ellipse in the case of single ellipse. The switching field of two ellipses in series is higher than that of each individual one. The stronger shape anisotropy is accounted for the increasing of switching field in longer element, in which two ellipse in series can be seen as a longer element as a whole. In the case of two identical and a longer ellipses in series, the switching field falls in‐between those two measured on individual shorter and longer ones. Magnetic force microscopy reveals a wavelike domain configuration nucleated during magnetization reversal only in the middle one of three chained ellipses, in which this kind of non‐coherent reversal process may contribute to the decreasing of the switching field. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Research for magnetocaloric effect of Gd1–xDyx alloy
Authors: Hou Xueling , Shitao Li , An Zhang , Hui Xu , Ni Jiansen , Zhou Bangxin 
Published: December 2007

AbstractThe magnetocaloric effect (MEC) in Gd1–xDyx (x = 0.13, 0.20, 0.27, 0.34, 0.40) alloys is investigated using commercial elements with purity of up to 99.80% for Gd and Dy. These alloys are prepared by arc melting in stoichiometric proportions on a water‐cooled copper crucible under high pure argon atmosphere. As a result, when x was changed from 0 to 40at%, the adiabatic temperature change (ΔT) increases from 1.6 K to 3.1 K, the Curie temperature decreased from 288 K to 245.5 K. Gy73Dy27 exhibits the largest ΔTmax value of 3.1 K at the TC value of 260 K among the alloys investigated up to 1.2 T (tesla) applied field, it is almost same as the ΔT of high pure unitary Gd (99.99%) and is clearly superior to commercial unitary Gd (99.80%). The TC of Gy73Dy27 alloy is minor to high pure unitary Gd (99.99%) and commercially unitary Gd (99.80%). But this alloy prepared by commercial elements with low cost has better MEC to be a promising candidate for magnetic working substances for room temperature magnetic refrigeration. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Figures of merit of magneto‐optic spatial light modulators with magnetophotonic crystals
Authors: Takahashi K. , Takagi H. , Shin K. H. , Uchida H. , Lim P. B. , Inoue M. 
Published: December 2007

AbstractThis paper presents the simulated and measured results of two types of one dimensional magnetophotonic crystals (1‐D MPC) with single cavity and dual cavity respectively for applcation to thin film type magneto‐optic spatial light modulators (MOSLMs). The use of MPC is expected to be effective for thin film type MOSLM, because the apparent Faraday rotation is largely enhanced due to light localization in magnetic defect layer of MPC with a large number of periodic dielectric layers. The complex chracteristics of MPCs are discussed in this paper – Faraday rotation θF, transmittance T, and figure of merit F = T sin(2θF). It is key point of finding optimal structure of MPC for application of MOSLM to use F, because the T decreased with increase of k, while Faraday rotation θF increased, indicating that the enhancement of light modulation rate could be achieved by optimizing the figure of merit F defined by F ≈ T ·sin2θF. The maximum F = 13.7 was obtained in dual cavity MPC, while F = 12.5 was obtained in single cavity MPC. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Magnetization curves of dipolar coupled nanomagnets
Authors: Mamiya H. , Nakatani I. , Nimori S. , Furubayashi T. 
Published: December 2007

AbstractInteracting superparamagnet (ISP) model that describes the effects of dipolar coupling on the magnetizing process is examined for assemblies of anisotropic nanomagnets by controlling the coupling strength using two different methods. In the first method, the magnetic moment of each nanomagnet is grown by annealing CoAg nanogranular films. In the second method, the number density of nanomagnets in solidified iron‐nitride magnetic fluids is controlled by the dilution in their melted states. Both the systems show temperature‐independent magnetizing curves at lower temperatures, as predicted by the ISP model. However, in contrast to the prediction, this feature can be primarily attributed not to the dipolar coupling but to magnetic anisotropy of each nanomagnet. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Design of a slim optical image stabilization actuator for mobile phone cameras
Authors: Yu Hsing‐Cheng , Liu T. S. 
Published: December 2007

AbstractMechanical optical image stabilization actuator (OISA) will quickly become a standard feature in a high resolution mobile phone camera (MPC) and the quantity of MPC will exceed that of digital still cameras in several years. Whenever jitter arises from shaky hands or environment in taking photos, optical images projected upon an image sensor blur. Designing a slim OISA in MPC is an effective solution that addresses image quality. Therefore, this work presents a slim OISA utilized in MPC to compensate jitter form camera shake in taking photos. Two proportional‐integral‐derivative controllers based on transfer functions for dual axes of the slim OISA system in MPC obtained from system identification have been designed. The settling time of dual axes are less than 0.03 sec. Furthermore, a thrust ball bearing in this study has reduced the friction force between the movable and the stationary parts, so as to minimize the driving current to be less than 5 mA. Hence, the slim OISA has satisfied low power consumption requirement, and is also possible to reduce dimension in the MPC application. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Detection of inverse spin‐Hall effect in palladium
Authors: Harii K. , Ando K. , Sasage K. , Saitoh E. 
Published: December 2007

AbstractWe report that a Pd film exhibits strong inverse‐Spin‐Hall effect (ISHE) at room temperature using the spin pumping operated by ferromagnetic resonance. The intensity of ISHE in Pd was found to be comparable to that in a Pt film. This result indicates an important role of the spin‐orbit scattering in the spin‐Hall effects. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Soft magnetic properties of patterned Co‐based amorphous wires with various dimensions
Authors: Park Chang Bean , Kim Do Hun , Chun Dong Won , Han Jun Hyun , Choi Heon Jin , Jeung Won Young 
Published: December 2007

AbstractSoft magnetic properties of melt spun Co‐based amorphous wires fabricated by photo lithography and wet etching processes were examined with length (1 ∼ 10 mm), width (200 μm ∼ 6 mm), and thickness (3 ∼ 20 μm) variation. The value of coercivity Hc, susceptibility κ and squareness were extracted from M‐H curve measured using a vibrating sample magnetometer (VSM). Monotonic increase of these values with aspect ratio of the wires was observed, which shows that the magnetic properties of the samples were largely determined by shape anisotropy. The observed phenomena were explained by the competition between domain wall pinning and demagnetizing field. It was shown that, when the sample's residual stress is constant, demagnetizing factor largely determines its magnetic properties. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Research progress on high performance Nd‐Fe‐B permanent magnet
Authors: Li W. , Pan W. , Guo Y. Q. , Guo Z. H. , Zhu M. G. , Li A. H. , Li X. M. , Cui J. W. 
Published: December 2007

AbstractWe have systemically investigated the correlations among magnetic characterization and lattice distortion as well as multiphase couplings during the fabrication process of the high performance Nd‐Fe‐B magnets. Rietveld structural refinement is employed to determine the atomic occupations in every phase in Nd‐Fe‐B magnet. The magnetism of Nd‐Fe‐B was studied with a modified magnetic valence model. It reveals that the magnetic moment only depends on the total number of d and s‐p as well as f electrons, not on the band shape. The coercivity of Nd‐Fe‐B magnet is related to the Nd‐Fe coupling, and its hard magnetic characteristics is derived from the Nd‐B layers. The extra Nd atoms are necessary to be arranged near to the Fe‐Fe layers or Fe atomic clusters for forming Nd‐Fe pairs, which enhances the coercivity. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Novel actuator with flat movable part for optical pickup head
Authors: Ke Chau‐Yuan , Huang Ruey‐Shing 
Published: December 2007

AbstractIn an optical pick‐up head, the objective lens actuator is a key component used to move the objective lens to the exact position for focusing the laser spot on the disc recording layer and keeping the laser spot following certain track on the disc. In order to be used in a compact pick‐up head for high density drives, the objective lens actuator must be compact and controllable in focusing, tracking, and radial tilt directions. In this paper, an electromagnetic three‐axis‐controllable actuator with a novel structure was designed and verified. Magnetic circuit analysis and structural modal analysis were also done in this work. Results of the frequency response tests done with the prototypes corresponded with the simulation results, and the reading tests done by using a pick‐up head with the actuator designed in this work proved the feasibility of this design. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
High‐frequency ferromagnetic properties of FeCoZr nanocrystalline films
Authors: Peng Yung‐Wang , Li Shandong , Liu Kai‐Xin , Duh Jenq‐Gong , Yamaguchi Masahiro 
Published: December 2007

AbstractFeCoZr magnetic thin films with high uni‐axial anisotropy were fabricated by RF co‐sputtering followed by post magnetic annealing. The crystal size of FeCoZr films was less than 15 nm, as calculated by Scherrer equation from X‐ray diffraction patterns. By adding Zr element, FeCoZr films exhibited a uni‐axial anisotropy after magnetic field annealing at 400 °C for 1 hr. Optimal high frequency ferromagnetic properties were achieved in film with 19 at.% Zr, in which strong uni‐axial anisotropy field of 300 Oe and high ferromagnetic resonance frequency in excess of 5.2 GHz were obtained. These facts suggest that FeCoZr nano‐crystalline film is a potential candidate in high frequency electromagnetic devices operating at GHz bands. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Double‐layered microwave absorbers composed of ferrite and carbon fiber composite laminates
Authors: Kim Sun‐Hong , Park Yong‐Gwon , Kim Sung‐Soo 
Published: December 2007

AbstractMicrowave absorbing properties of ferrite‐epoxy composite (absorbing layer) attached on the carbon fiber polymer composite (reflective substrate) are analyzed on the basis of wave propagation theory. A modified equation for wave‐impedance‐matching at the front surface of absorbing layer including the effect of electrical properties of the quasi‐conducting substrate is proposed. Based on this analysis, the frequency and layer dimension that produce zero‐reflection can be estimated from the intrinsic material properties of the absorbing layer and the substrate. It is demonstrated that the microwave reflectivity of carbon fiber composite has a strong influence on the microwave absorbance of front magnetic layer. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Nano‐order depth control in magnetic grating
Authors: Maeda Atsushi , Susaki Masami 
Published: December 2007

AbstractApodized grating, in which the groove depth was gradually and systematically changed, was carved on the surface of yttrium‐iron‐garnet (YIG) single crystal film by using high‐precision dicing saw. Scanning probe microscope observation indicated that nano‐order modulation was realized in the grating depth as designed. Both of the periodicity and linearity in the grating structure were also controlled well. These experimental results suggest that the mechanical process utilizing the dicing saw is promising as the micro‐fabrication technique with the nano‐order depth control. In comparison with the normal YIG grating filters, the ripples disappeared from the frequency response of the apodized YIG grating filters. The superb propagation characteristics are probably associated with the gentle change in impedance. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Measurement of AC current using an optical fibre sensor
Authors: Cheng C. H. , Chen M. H. , Liu W. F. 
Published: December 2007

AbstractIn the power industry, current is measured for metering and protection purposes. For said measurement, we demonstrated an optical fibre sensor using a single Fibre Bragg Grating (FBG) for measuring AC current for this paper. The sensor head is based on an FBG encased in a polymer‐half‐field metal cylinder, embedded in a magnetic material at the measuring point with the characteristics of an all‐optical high pressure sensitivity. The operating mechanism is that the sensor can be attracted by the induced magnetic force created by the solenoid along one radial direction only, and responds to an axial force on the magnetic rod attached to the round plate, creating an axial attraction on the FBG. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Performance and applications of a small PM generator
Authors: Hwang C. C. , Tien C. L. , Chang H. C. 
Published: December 2007

AbstractThis paper presents a high‐speed low‐power small permanent magnet (PM) generator for aerospace applications where environmental requirements are very severe. Since Alnico magnet material has a low temperature coefficient of remanent flux density and maximum service temperature, it is suitable for the application. Furthermore, the main disadvantage of PM generators is the difficulty of output voltage regulation to compensate for speed and load variation, due to the lack of a simple means of field control. Hence, a circuit is used to connect to the generator to provide a fixed dc voltage to the load. The steady‐state performance is analyzed by the finite element (FE) method. Experimental tests are conducted to verify the FEM predictions. Agreement between FE analysis work and testing results is good. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Correlation between crystal structure and exchange bias of FePt/FeMn multilayers in parallel and perpendicular directions
Authors: Phuoc Nguyen N. , Suzuki Takao 
Published: December 2007

AbstractA systematic study of parallel and perpendicular exchange biases and blocking temperatures in correlation with the crystal structure of FePt/FeMn multilayers fabricated onto MgO(001) substrates by ion beam sputter‐deposition system was conducted. It was evident that the exchange bias and blocking temperature have a close relation with the formation of the fcc FeMn phase. Besides, the blocking temperature of parallel exchange bias was found to be higher than that of the perpendicular one. The discrepancy was interpreted as due to the spin canting out of plane at the interface. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Preface: phys. stat. sol. (c) 4/12
Authors: Lim Sang Ho 
Published: December 2007

AbstractISAMMA 2007 was the first consolidated symposium of the three previous symposia held in the Asian region: ISPMM (International Symposium on Physics of Magnetic Materials) of Japan which started in 1987, ISAMT (International Symposium on Spintronics and Advanced Magnetic Technologies) of Taiwan and SOMMA (International Symposium on Magnetic Materials and Applications) of Korea, both of which started in 1999. Considering that there are too many international and domestic meetings around in recent years, I am sure that this kind of consolidation will benefit the people working in magnetics research in the region. ISAMMA 2007 was held on Jeju island, Korea, during the period 28 May to 1 June 2007. The number of participants was 533 from 26 countries. These statistics clearly indicate that the meeting was truly international! The number of presentations was even higher, there being a total of 613 presentations (174 oral presentations including invited talks and 439 poster presentations). A wide range of subjects were covered in the symposium. The technical sessions included:– Biomagnetics– Magnetotransport– Thin films and multilayers– Magnetoresistive Random Access Memory (MRAM)– Nanostructured materials– Spintronics– Magnetic oxides and multiferroics– Magnetic recording and magneto‐optical recording– Magnetic theory and calculation– Hard magnetic materials– Soft magnetic materials– Magnetic sensors and devices– Spin dynamics– Magnetic oxidesThe number of manuscripts submitted was approximately 320, among which ∼200 manuscripts were accepted and included in the proceedings. It was a challenging task to deal with such a large number of manuscripts in a short period of time. The formidable task has been completed successfully mainly thanks to the great efforts by the Publication Editors: Dr. Naoki Honda (Akita Research Institute of Advanced Techology, Japan), Prof. Minn‐Tsong Lin (National Taiwan University, Taiwan), Prof. Masahiro Yamaguchi (Tohoku University, Japan), and Prof. Kyung‐Jin Lee (Korea University, Korea). The assignment of reviewers in some sessions was problematic, causing extra burden to the Editors. Due to this and other unexpected problems, the job the editors have done is much beyond the originally anticipated one. My sincere thanks go to you all for your professional service and time, without which the proceedings would have not been issued in the present form. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
QSAR Study of Cyclic Urea Type HIV‐1 PR Inhibitors Using Ab Initio MO Calculation of Their Complex Structures with HIV‐1 PR
Authors: Yoshida Tatsusada , Yamagishi Kenji , Chuman Hiroshi 
Published: December 2007

AbstractA quantitative structure‐activity relationship study was carried out on a series of cyclic urea type HIV‐1 protease inhibitors. In order to determine the atomic and electronic mechanisms in detail, three‐dimensional and electronic descriptors were calculated with the molecular dynamics and ab initio fragment molecular orbital calculation of the whole complex structure of HIV‐1 protease with each inhibitor. Two descriptors showing correlation with the inhibitory potency were the total interaction energy and the change in the accessible surface area on complex formation with HIV‐1 protease. The major contributions to the total electronic interaction energy were found to be from Asp25/25′, Asp30/30′ and Ile50/50′. The interaction energy with Asp30/30' was nicely correlated with the total electronic interaction energy and also with the charge transfer from Asp30/30′, which is in close contact with the substituted moiety in each inhibitor. As well as the hydrophobic interaction, the charge redistribution among the inhibitor and surrounding residues was suggested to govern the variation in the inhibitory potency. The results obtained in this work can help us to reinterpret the classical QSAR descriptors proposed by Garg et al.