bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of crystalline orientation and lattice distortion of FeCo spin polarization enhancement layer in perpendicular magnetic tunnel junction with RE-TM alloy films
Authors: Miyamoto Naoaki , Ohmori Hideto , Mamiya Keisuke , Nakagawa Shigeki
Published: May 2010

Relationship between FeCo crystalline orientation and magnetic properties of TbFeCo/FeCo/Ta trilayer films was investigated. FeCo crystalline orientation could be controlled by changing FeCo deposition rate. Ferromagnetic Hall effect observation clarified that perpendicular component of magnetization in FeCo layer of TbFeCo/FeCo(001)/Ta were better than that of TbFeCo/FeCo(110)/Ta. Lattice spacing of both FeCo(001) films and FeCo(110) ones in the TbFeCo(50 nm)/FeCo (X nm) was also observed. Expansion ratios of FeCo(001) toward film normal direction were higher than that of FeCo(110) as increasing FeCo film thickness, and this indicated that FeCo(001) films were more favorable for magnetic coupling with rare-earth transition metal (RE-TM) alloy films than FeCo(110) ones when FeCo films become thick. However investigation of relationship between FeCo expansion ratios and magnetic properties of TbFeCo/FeCo(001) or (110) (X nm)/Ta trilayer films showed that squareness ratios of specimens with FeCo(001) were worse than that with FeCo(110).
Off-axis deposition of Al layer for low resistance tunnel barrier
Authors: Bandiera S. , Sousa R. C. , Ducruet C. , Portemont C. , Auffret S. , Prejbeanu I. L. , Dieny B.
Published: May 2010

In order to improve the magnetic and electrical properties of low resistance alumina based magnetic tunnel junctions, an off-axis method of sputtering has been investigated. It is shown that the tunnel magnetoresistance ratio can be greatly increased when there is an offset between the target and the wafer axes during the deposition of the ultrathin aluminum layer (off-axis sputtering) prior to its natural oxidation. The ferromagnetic coupling between the pinned and the free layer through the alumina barrier is also reduced compared to a classical on-axis deposition. This observation is interpreted as an improvement of the barrier quality, reducing both the roughness and the pinholes density. We assume that when the Al layer is sputtered off-axis, the magnetic and aluminum layers are protected from energetic neutralized Ar atoms bombardment.
Temperature dependence of magnetoresistance oscillations due to Coulomb staircases in a nanometer vertical ferromagnetic tunnel junction
Authors: Haraichi Satoshi
Published: May 2010

Magnetic random access memory is considered to be a promising candidate for a future nonvolatile memory. The size of the magnetic tunnel junction (MTJ) cell has been gradually decreasing and has reached the sub-100 nm level. As the size of the MTJ cell approaches the 10 nm level, we must consider the effects of the interaction between the spin-dependent tunneling and the Coulomb blockade, such as magneto-Coulomb oscillation. Spin-dependent tunneling in a nanometer ferromagnetic junction has been investigated in Coulomb blockade regime. The current-bias voltage (I-V) characteristics of NiO/Co/NiO/Co double junctions with a 30 nm contact hole fabricated by an electron beam direct process have been measured in magnetic fields. The temperature dependence of the I-V curve shows clear Coulomb staircases at temperatures below 50 K. At 12 K, the Coulomb threshold of the I-V curve depends on the magnetization configuration, which leads to a tunnel magnetoresistance (TMR) of over 500% around the Coulomb threshold. Although the origin of such a large TMR has not been well proven, spin accumulation in a nanometer metal island is considered. The bias dependence of TMR shows oscillatory behavior due to Coulomb staircases, and at higher temperatures, the TMR oscillations disappear. The TMR oscillation results from the enhancement of TMR at the steps of the Coulomb staircase associated with discrete charging effects and spin accumulations of a nanometer metal island.
Cooling performance of a room-temperature magnetic refrigerator prototype
Authors: Zhang Hong , Shen Jun , Gong Mao-Qiong , Wu Jian-Feng
Published: May 2010

The experimental prototype described in this research is a reciprocating active magnetic refrigerator with two permanent magnets and two active magnetic regenerators. Extensive tests have been carried out to measure the cooling performance of this prototype with nitrogen or helium as the heat transfer fluid. The prototype can produce a relatively large cooling power and a wide temperature span even at low charging pressure of the heat transfer gas. The lowest no-load cooling temperature of 3.2 °C, a maximum temperature span of 24.6 K and a maximum cooling power of 20.5 W around 4.5 K were achieved with helium as the heat transfer fluid at a pressure of 1.2 MPa, a frequency of 0.6 Hz, a phase angle of 90° and a gas displacer stroke of 180 mm. The influences of operating frequency and the heat transfer gas charging pressure on the refrigeration performance were experimentally investigated and discussed.
Neutron powder diffraction study and magnetic properties in LaMn1−xCuxO3 (x=0.05, 0.10 and 0.15)
Authors: Samantaray B. , Srivastava S. K. , Mohanty S. , Ravi S. , Dhiman I. , Das A.
Published: May 2010

LaMn 1 − x Cu x O 3 (x=0.05 to 0.15) samples were prepared and their crystal structure and magnetic properties were studied by recording neutron powder diffraction patterns and M-H loops at different temperatures. Even though the samples were free from impurity, the x=0.05 and 0.10 samples are found to crystallize in mixture of R3¯c and Pnma space group with dominate fraction of former one. The phase fraction for x=0.10 sample is found to vary with temperature especially below the ferromagnetic TC. The x=0.15 sample could be refined based on Pnma space group. The patterns at low temperatures could be refined by considering magnetic reflections corresponding to ferromagnetic structure. The magnetic moments of Mn ion are found to be along b axis with typical value of 3.40(3)μB for x=0.10 sample. From the analysis of the diffraction patterns and the magnetization data, it is found that x=0.15 sample exhibit spin canting.
Magnetism of core-shell Ti:TiO nanoparticles
Authors: Wei Xiaohui , Skomski Ralph , Balamurugan B. , Sellmyer D. J.
Published: May 2010

Ti nanoparticles were produced using a cluster-deposition method. Ti:TiO core-shell structures were fabricated by partially oxidizing the surface of the Ti nanoparticles produced by a cluster-deposition system via multistep annealing at 250 °C in oxygen. X-ray diffraction and transmission-electron microscopy studies reveal an increase in the thickness of the TiO shell with increasing annealing time. The magnetic moment and the coercivity of the core-shell nanoparticles increase with the TiO shell thickness, which is consistent with homogenous bulk defects in TiO. The core-shell nanoparticles display an abnormal hysteresis loop, which probably reflects a combination of antiferromagnetic exchange and magnetocrystalline anisotropy.
Synthesis and magnetic properties of the double layer perovskite CeBaFe2O5+w
Authors: de Almeida R. L. , de Lima O. F. , Coaquira J. A. H. , Altoé M. L. , Quezado S. , Malik S. K.
Published: May 2010

The synthesis, crystallographic structure, and magnetic properties of polycrystalline single-phase samples of CeBaFe2O5+w are reported. An orthorhombic structure belonging to the Pmmm space group was identified through Rietveld analysis of x-ray diffraction data. The room temperature lattice parameters were found to be a=3.9666(1) Å, b=3.9314(1) Å, and c=7.8291(1) Å. A sudden change in magnetization at the temperature of 130 K was attributed to a Verwey-type transition, and a broader change at 220 K was attributed to a Verwey premonitory transition, as expected in the RBaFe2O5+w compounds (R=rare earth). At a much higher temperature, a paramagnetic to ferromagneticlike transition was observed around 600 K.
Colossal dielectric constant and relaxation behaviors in Pr:SrTiO3 ceramics
Authors: Liu Cheng , Liu Peng , Zhou Jian-ping , He Ying , Su Li-na , Cao Lei , Zhang Huai-wu
Published: May 2010

Sr 1 − x Pr x TiO 3 ceramics (0.00≤x≤0.03) were prepared by a traditional solid-state reaction method. Two relaxation processes (marked as A and B) of the Sr0.09Pr0.01TiO3 ceramics were investigated by analyzing the Ea values obtained from the Arrhenius law. Colossal dielectric constant (CDC) was first obtained in Sr0.09Pr0.01TiO3 ceramics, whose permittivity was up to 3000 (1 kHz, room temperature), greater than that of pure SrTiO3 ceramics and samples with more Pr addition (x=0.02 and 0.03). This CDC behavior was related to the internal barrier layer capacitance mechanism.
Beamformer for simultaneous magnetoencephalography and electroencephalography analysis
Authors: Ko Seokha , Jun Sung Chan
Published: May 2010

We proposed the beamformer for simultaneous magnetoencephalography (MEG)/electroencephalography (EEG) analysis which has the synergy effects such as high spatial resolution, low localization bias and robustness for orientation of brain sources. Through Monte Carlo simulation study, it was found that the localization performance of our proposed beamformer was far superior to those of MEG-only and EEG-only. For the given specific sensor geometry (160 MEG, 50 EEG sensors), we investigated comparative localization performance of our proposed beamformer over various weighting factors of MEG data, while weighting factor of EEG keeps fixed. Furthermore, we demonstrated its capability for simulated two dipole problem and empirical somatosensory median nerve stimulation data.
Magnetic transition in the rare earth intermetallic compound Ce5Ge4: Heat capacity and neutron diffraction studies
Authors: Nirmala R. , Morozkin A. V. , Lamsal Jagat , Yelon W. B. , Malik S. K.
Published: May 2010

Polycrystalline Ce5Ge4 compound (orthorhombic Sm5Ge4-type structure, space group Pnma, No. 62) orders ferromagnetically at ∼12 K (TC). Low field dc magnetization and ac magnetic susceptibility data reveal presence of competing magnetic interactions below TC. Heat capacity of Ce5Ge4 in zero applied field indicates a second order transition with a peak centered at 11 K. Powder neutron diffraction studies confirm the existence of a commensurate magnetic order in this compound at 10 K without a change of crystal structure. The Ce moments lie in the ab plane and the moment at Ce site is found to be only ∼0.4 μB at this temperature.
Structural characterization of metastable hcp–Ni thin films epitaxially grown on Au(100) single-crystal underlayers
Authors: Ohtake Mitsuru , Tanaka Takahiro , Kirino Fumiyoshi , Futamoto Masaaki
Published: May 2010

Ni ( 11 2 ¯ 0 ) epitaxial thin films with hcp structure were prepared on Au(100) single-crystal underlayers at 100 °C by ultra high vacuum molecular beam epitaxy. The detailed film structure is studied by in situ reflection high energy electron diffraction, x-ray diffraction, and transmission electron microscopy. The hcp–Ni film consists of two types of variants whose c-axes are rotated around the film normal by 90° each other. An atomically sharp boundary is recognized between the film and the underlayer, where misfit dislocations are introduced. Presence of such dislocations seems to relieve the strain caused by the lattice mismatch between the film and the underlayer.
Structural, magnetic and magneto-transport properties of Pt-alloyed MnBi thin films
Authors: Kharel P. , Skomski Ralph , Kirby R. D. , Sellmyer D. J.
Published: May 2010

The structural, magnetic and magneto-transport properties of highly c-axis oriented Mn55−xPtxBi45 (x=0, 1.5, 3, and 4.5) thin films have been investigated. The coercivity of the Pt-alloyed thin films increases and the saturation magnetization decreases as the Pt concentration increases. The anisotropy field Ho increases as a function of Pt concentration, too but the coercivity increases more rapidly than the anisotropy field. This indicates an enhanced domain-wall pinning, caused by increased interstitial disorder due to the occupancy of regular Mn sites by Pt. The same mechanism explains the reduced magnetization. All samples exhibit a large extraordinary Hall effect with anomalous Hall coefficient about an order of magnitude larger than the ordinary Hall coefficient.
Surface magnetization processes in soft magnetic nanowires
Authors: Lupu N. , Lostun M. , Chiriac H.
Published: May 2010

The surface magnetization processes taking place in simple permalloy (Py) and FeGa nanowires, Py/Cu, CoFeB/Cu, CoNiP/Cu, FeGa/Py, and FeGa/CoFeB multilayered nanowires have been studied by magneto-optical Kerr effect (MOKE) magnetometry. The results indicate a strong correlation between the direction of the anisotropy axis relative to the direction of the applied field and the plane of incidence of the laser spot, as well as the effect of dipolar interactions between the nanowires or between the ferromagnetic layers on the magnetization reversal. The larger laser spots are inducing more noise in the MOKE hysteresis loops because of the dimensional imperfections along the nanowires.
Magnetic moment formation at a dilute C140e impurity in RCo2 compounds
Authors: de Oliveira A. L. , Chaves C. M. , de Oliveira N. A. , Troper A.
Published: May 2010

A great deal of experimental work using perturbed angular correlation has succeed in measuring hyperfine fields in Ce diluted in metallic systems, thus allowing the determination of the local impurity moment at low temperatures. Motivated by such experimental work on C140e placed on a R site of the rare earth (R=Gd,Tb,Dy,Ho,Er) in RCo2, we theoretically discuss, within a simple model, the local magnetic moments and, thereby, calculate the magnetic hyperfine fields. The results are in good agreement with the experimental data. For the sake of comparison we recall our previous results on Ta d-impurity embedded in the same hosts.
Enhanced magnetization in epitaxial SrRuO3 thin films via substrate-induced strain
Authors: Grutter Alexander , Wong Franklin , Arenholz Elke , Liberati Marco , Suzuki Yuri
Published: May 2010

Epitaxial SrRuO3 thin films were grown on SrTiO3, (LaAlO3)0.3(Sr2AlTaO6)0.7, and LaAlO3 substrates inducing different compressive strains. Coherently strained SrRuO3 films exhibit enhanced magnetization compared to previously reported bulk and thin film values of 1.1–1.6μB per formula unit. A comparison of (001) SrRuO3 films on each substrate indicates that strained films have consistently higher saturated moments than corresponding relaxed films, which exhibit bulk moments. These observations indicate the importance of lattice distortions in controlling the magnetic ground state in this transitional metal oxide.
Lanthanum doped multiferroic DyFeO3: Structural and magnetic properties
Authors: Du Y. , Cheng Z. X. , Wang X. L. , Dou S. X.
Published: May 2010

Lanthanum doped multiferroic DyFeO3 was synthesized by solid state reaction. X-ray diffraction and refinement show that the lattice parameters of Dy1−xLaxFeO3 increase linearly with the La content. Raman spectroscopy reveals that the short-range force constant in Dy1−xLaxFeO3 is decreased by La3+ ion substitution. The spin reorientation phase transition temperature (TSRPT) is observed to decrease along with the doping level. The antiferromagnetic ordering temperature TN of Fe3+ ions is depressed with increasing doping level. Both decreasing TSRPT and decreasing TN indicate that Fe–Dy and Fe–Fe interactions are weakened by La substitution. It is found that the electron configuration of Fe3+ is high spin state and not affected by the La doping in all the samples above TN.
A magnetoelastic force transducer based on bending a circumferentially magnetized tube
Authors: Garshelis Ivan J. , Tollens Stijn P. L.
Published: May 2010

A new type of magnetoelastic device for sensing force is described. It consists of two elements: a circumferentially magnetized tube of magnetoelastically active material, mounted as a beam and loaded by the force to be sensed, and a magnetic field sensor mounted at or near the tube’s surface, at or near a longitudinal location where the bending moment is maximum and at a circumferential location where the stress is zero. The flexural loading is shown to cause a variation in the circumferential magnetization with angular position. This variation is the source of free poles, the field from which is a measure of the applied force. Analysis predicts, and experiments demonstrate that the field intensity is a linear analog of the force over a significant range of push and pull forces.
Strain sensor using stress-magnetoresistance effect of Ni–Fe/Mn–Ir exchange-coupled magnetic film
Authors: Sonehara M. , Shinohara T. , Sato T. , Yamasawa K. , Miura Y.
Published: May 2010

A strain sensor using a stress-magnetoresistance effect of a Ni–Fe/Mn–Ir exchange-coupled magnetic film was fabricated and evaluated. The stress magnetoresistance is used in the inverse magnetostrictive effect and the magnetoresistance effect in the magnetic film since an external stress is changed into an electric resistance in it. A compressive stress was measured by the strain sensor with a Mn–Ir (10 nm)/Ni–Fe (50 nm)/Ru (1 nm) exchange-coupled film. The change in resistivity Δρ/ρ is proportional to the applied compressive stress σ for σ≦50 MPa in the strain sensor. When increasing Ni–Fe layer thickness in the strain sensor, a gauge factor increased.
Influence of mechanical load bias on converse magnetoelectric laminate composites
Authors: Wu Tao , Emmons Michael , Chung Tien-Kan , Sorge Jian , Carman Gregory P.
Published: May 2010

A piezofiber/Metglas (PFM) magnetoelectric (ME) laminate has been integrated into a graphite epoxy composite (GEC) to study the converse ME effect (CME). Experimental data on a PFM/GEC subjected to both a dc magnetic field bias and a dc mechanical load bias while exciting it with an ac electric driving voltage are presented. Results of these tests indicate that both the mechanical load and the dc magnetic field strongly influence the CME response. Furthermore, an optimum mechanical load exists to maximize the CME coefficient, which should also be present in standalone ME laminates. These results reveal that the CME coefficient can be further increased with a proper mechanical load bias. Therefore, the selection of an appropriate mechanical preload as well as dc magnetic bias will maximize the CME response and sensitivity in ME laminates as well as integrated structural systems.
Modeling of the magnetoelectric effect in finite-size three-layer laminates under closed-circuit conditions
Authors: Liverts E. , Auslender M. , Grosz A. , Zadov B. , Bichurin M. I. , Paperno E.
Published: May 2010

A theoretical model is presented for the low-frequency magnetoelectric (ME) effect in three-layered magnetostrictive-piezoelectric laminates. The model considers both the laminate finite size and the detection circuitry loading (closed-circuit conditions). The model development is based on a system of electroelasticity and magnetoelasticity equations and takes into account the boundary conditions at the inner and outer surfaces of the laminate. An averaging method is used to estimate the effective parameters of the laminate materials. The ME voltage coefficient for transverse fields is obtained theoretically. The obtained solution allows us to set up the laminate equivalent electrical circuits and to find their electrical parameters in terms of the physical properties of the laminate and its geometry.
Low temperature synthesis, structural, and magnetic characterization of manganese sillenite Bi12MnO20
Authors: de Oliveira L. A. S. , Sinnecker J. P. , Vieira M. D. , Pentón-Madrigal A.
Published: May 2010

A low temperature (≈393 K) soft chemical route under refluxing conditions has been followed to prepare polycrystalline manganese sillenites, Bi12MnO20 (BMO). X-ray diffraction and scanning electron microscopy show a cubic BMO pure phase with a=10.206 Å, homogeneous morphology, and nanoparticle size. A detailed study of the magnetic properties is presented. The zero-field-cooled and field-cooled magnetization curves show a typical nanoparticle behavior with blocking temperature TB≈18 K. The ac susceptibility measured at different frequencies gives an Arrhenius behavior compatible with the superparamagnetic nanoparticle relaxation processes but with an unusually small relaxation time. The relaxation time is shown to be field dependent due to strong interparticle interaction.
Spectroscopy of drums and quantum billiards: Perturbative and nonperturbative results
Authors: Amore Paolo
Published: May 2010

We develop powerful numerical and analytical techniques for the solution of the Helmholtz equation on general domains. We prove two theorems: the first theorem provides an exact formula for the ground state of an arbitrary membrane, while the second theorem generalizes this result to any excited state of the membrane. We also develop a systematic perturbative scheme which can be used to study the small deformations of a membrane of circular or square shapes. We discuss several applications, obtaining numerical and analytical results.
Nuclear magnetic resonance study of some Ce-based superconductors with noncentrosymmetric crystal structure
Authors: Ueda Koh-ichi , Koyama Takehide , Kohara Takao
Published: May 2010

NMR experiments on two kinds of Ce-based superconductors with noncentrosymmetry in the crystal structures were performed. They are CePt3Si and CeIr0.65Co0.35Si3 with 0.75 and 0.55 K of Tc’s, respectively. By annealing of the crushed sample, CePt3Si recovers two distinct phases, which are coexistent in the crystal, and one of two phases gets the improved characters of single crystal. The angular dependence of an aligned axis and an applied magnetic field exhibits that the internal field must be parallel to the c-axis at Si site below TN, which appears to be inconsistent with the results obtained by the neutron diffraction. On the other hand, a CeIr0.65Co0.35Si3 sample with noncentrosymmetry also shows a clear Meissner diamagnetization at 0.55 K under an ambient pressure and yields a clear Co NMR spectrum with an electric quadrupole splitting.
Magnetostructural transition in Ce(Fe0.975Ga0.025)2 compound
Authors: Haldar Arabinda , Singh Niraj K. , Mudryk Ya. , Nayak Ajaya K. , Suresh K. G. , Nigam A. K. , Pecharsky V. K.
Published: May 2010

The magnetic and magnetostructural properties of the polycrystalline Ce(Fe0.975Ga0.025)2 have been investigated as a function of temperature and magnetic field. In Ce(Fe0.975Ga0.025)2 the magnetic transition from antiferromagnetic (AFM) to ferromagnetic (FM) state is accompanied by a structural transformation from rhombohedral to cubic structure. Phase coexistence is present during both the temperature and field driven transformations from AFM to FM phase.
Nanocoating of particles for optimal doping and universal enhancement of current-carrying ability in “organic” MgB2−xCx superconductors
Authors: Shcherbakova O. V. , Pan A. V. , Dou S. X. , Nigam R. , Wexler D.
Published: May 2010

The universal approach of liquid mixing has been found to produce “organic” MgB2−xCx superconductors with structural and supercurrent-carrying properties unattainable by other techniques. We show by transmission electron microscopy combined with energy dispersive spectroscopy that these unique properties are enabled through coating of boron particles with a nanolayer of carbon. The subsequent reaction between carbon-encapsulated boron and magnesium results in enhanced carbon content x in the crystal lattice, as determined by x-ray diffraction pattern analysis. Among various carbon-containing compounds investigated, polycarbosilane has been found to be the optimal dopant for MgB2 superconductor, producing the largest critical current density due to the formation of wide range of nanodefects with pinning properties within the MgB2 crystal lattice, as well as due to minimal formation of current-blocking layers around the grains.
Spin-glass ordering in the layered III-VI diluted magnetic semiconductor Ga1−xMnxS
Authors: Pekarek T. M. , Watson E. M. , Shand P. M. , Miotkowski I. , Ramdas A. K.
Published: May 2010

Magnetization and ac susceptibility measurements on single crystalline Ga1−xMnxS (x=0.09) have been measured near the spin-glass transition. No other III-VI diluted magnetic semiconductor (DMS) is currently known to exhibit a spin-glass transition for comparison with Ga1−xMnxS. Both the magnetization and ac susceptibility measurements were analyzed according to the appropriate universal scaling function for spin-glass transitions. The nonlinear magnetization scaled with the critical exponent values γ=4.0±1.0 and β=0.8±0.2 for a spin-glass transition temperature Tc=11.2±0.2 K. The analysis of the ac susceptibility’s out-of-phase component χ″(ω,T) yielded the parameter values Tc=10.8±0.3 K, zν=10±1, and β=0.6±0.3. The values of the critical exponents are consistent with those obtained in many DMS and non-DMS insulating spin glasses with different lattice structures and exchange interactions. These results indicate that III-V DMS materials such as Ga1−xMnxS belong in the same three-dimensional short-range Heisenberg universality class as other DMS and non-DMS insulating spin glasses.
Exciton kinetics and few particle effects in self-assembled GaAs-based quantum dashes
Authors: Sęk G. , Musiał A. , Podemski P. , Syperek M. , Misiewicz J. , Löffler A. , Höfling S. , Worschech L. , Forchel A.
Published: May 2010

We report on the emission properties of single molecular-beam-epitaxially grown InGaAs/GaAs quantum dashes. Supported by a few level rate equation model it has been revealed a decreased exciton to biexciton radiative lifetimes ratio being a fingerprint of a weak carrier confinement. Furthermore, a biexciton sideband, connected with the Coulomb interaction of quantum dash biexciton with excitons confined in the wetting layer (WL), has been observed in photoluminescence (PL). Both the effects have found a confirmation in direct measurements of PL decay times, including long radiative lifetimes of the WL states which appeared to have a localized character.
Layer and interface structural changes in Co0.6Fe0.2B0.2/AlOx multilayers on annealing
Authors: Pym A. T. G. , Rührig M. , Tanner B. K.
Published: May 2010

Sputtered multilayers of Co0.6Fe0.2B0.2 and AlOx have been measured using grazing incidence x-ray scattering to determine the changes in layer and interface structure during in situ annealing. We confirm our earlier deduction of a sharpening of the interfaces on annealing up to 400 °C. This sharpening arises from reduction in chemical intermixing, not from change in topological roughness and provides an explanation for the enhanced tunneling magnetoresistance. The annealing is shown to result in a decrease in Co0.6Fe0.2B0.2 mean layer thickness and increase in the layer density. There is a commensurate increase in AlOx mean layer thickness while at the same time there is a reduction in the layer density. The increase in thickness could explain the corresponding increase observed in the resistance-area product.
Large reversible magnetocaloric effect in Er3Co compound
Authors: Kumar Pramod , Singh Niraj K. , Nayak Ajaya K. , Haldar Arabinda , Suresh K. G. , Nigam A. K.
Published: May 2010

Magnetic and magnetocaloric properties of the intermetallic compound Er3Co have been studied. Temperature dependence of magnetization data shows that it exhibits ferromagneticlike bulk magnetic ordering at 14 K. For field changes (ΔH) of 20 and 50 kOe, the maximum values of isothermal magnetic entropy change are found to be 9 and 17 J/kg K, respectively. For ΔH=20 and 50 kOe, the relative cooling powers are found to be 140 and 450 J/kg, respectively. At temperatures above Tord, the spin fluctuations are found to affect the magnetocaloric properties of Er3Co.