Effect of Annealing on Microstructure of Ni80Fe20/Cu Multilayers
Magnetic Force Microscope Study on Quick-Quenched Ribbon Sm2Fe14.5Cu0.5Ca2Cx
The microstructure and magnetic domain structures of the annealed quick-quenched ribbon Sm2Fe14.5Cu0.5Ca2Cx were studied by using magnetic force microscope. The results of the topography image and magnetic force image (MFI) show that the grain size is between 25—55nm, whereas the domain size is between 200—400nm. The magnetic domain length scale is much larger than the grain size. The domain comprises of a lot of grains, which were called interaction domain. The detail analysis such as power spectral density analysis, the maximum phase shift and roughness analyses on the MFI demonstrated that they are connected with the intrinsic magnetic properties such as HA in some way.
The Texture and Topography of Melt-Spun Ribbons of Nd2Fe14B/α-Fe Two-Phase Permanent Magnetic Alloys
Study on Giant Magnetoresistance of Co/Cu/Co Sandwich on Different Buffer Layers
Low-Temperature Longitudinal Magnetoresis-Tance Effect in Ag2+δTe Thin Films
Colossal Magnetoresistance in Two-Element-Doped La-Ca-Ba-Mn-O
The Hall Effect in Ni0.8Co0.2-SiO2 Granular Film
Influence of Annealing Temperature on the Giant Magnetoresistance of Co35(SiO2)65 Nano-Granular Films
Effects of Carbon Content on the Formation and Critical Temperature of Y-Ni-B-C Superconductor
Structural and Magnetic Properties of Nanocomposite Alloy Nd4.5Fe76.3Ga0.3Co1.0B18
Effect of Co and Cr Substitution on the Magnetic Properties of Layered Perovskite Manganese Oxide La1.2Sr1.8Mn2O7
Magnetic properties of R(Fe1-xNix)11.3Nb0.7 Compounds
Structure and magnetic properties of R(Fe1-xNix)11.3Nb0.7 (R=Gd, Tb, Dy, Ho, Er and Y) compounds have been studied by means of X-ray diffraction and magnetic measurements. Substitution of Ni for a fraction of Fe does not change the structure of R Fe11.3Nb0.7, but leads to the contraction of the unit cell volume, the rapidly increasing of the Curie temperature and monotonic decreasing of saturation magnetization. It is notable that introduction of Ni leads to the sharply decline of the easy-axis anisotropy of Fe sublattice and the changes of the spin reorientation temperature Tsr of R Fe11.3Nb0.7 (R=Tb, Dy, Er). A qualitative explanation of the relationship of Tsr and Ni content is given based on the theory of crystal field.
Structures and Magnetic Properties of 3:29-Type Gd-Fe-Co-Cr Compounds
Magnetic Properties of RCo10Mo2(R=Y,Ho) Compounds
Effect of Pr3+ Doping Concentration on the Structure and Magnetic Properties of SrFe12O19 Compounds
Study on Dispersions of Width Mode of Magnetostatic Surface Wave Propagating in Periodic Multilayer Films
Doping Effects Arising From the Substitution of Ti for Mn in the Perovskite Compounds La2/3Ca1/3MnO3
The magnetic and transport properties of compounds La2/3Ca1/3Mn1-xTixO3(0≤x≤0.3) have been investigated. The substitution of Ti for Mn suppresses the ferromagnetism and metal conduction and increases magnetoresistance dramatically. In the case of low doping (x≤0.04), substituting Ti for 1% Mn lowers Curie temperature TC and metal-insulator transition temperature Tp by about 31 and 26.5K respectively. The magnetic spontaneous state becomes cluster glass state for the compound with x=0.06, and turns into spin-glass state for the compound with x=0.20. The magnetic dilution and the local lattice distortion due to the introduction of Ti are suggested to explain the experimental results.
Fabrication and Magnetic Properties of Arrays of Nickel Nanowires
Arrays of nickel nanowires are fabricated by electrochemical deposition into template-Anopor. The wires have high aspect ratio L/D=250, with diameter 200nm and length 50μm. The easy axis is perpendicular to the nanowire because of the static magnetic interaction between the neighbouring nanowires.
Study on the Magnetocaloric of Alloy Gd3Al2-xGax
A series of Gd3Al2-xGax alloys over a composition range (x=0,0.1,0.3,0.5) were prepared from high purity Gd, Al, and Ga by arc melting under purified argon atmosphere on a water-cooled copper crucible, then annealed in vacuum at 1073 or 1173K for 36h. The X-ray diffraction pattern indicated that these alloys were single phase of Zr3Al2-type structure. Magnetization isotherms at different tempertures of these alloys were measured between 180 and 300K under the magnetic field up to 1.12×106A/m using vibrating sample magnetometer. We found that magnetic entropy change of Gd3Al2-xGax(x=0.1,0.3,0.5) was larger than that of Gd3Al2, and the σs of change (about 3.0J/kgK) of Gd3Al2-xGax(x=0.1) was observed at 280K under a magnetic field of 1.12×106A/m.
Calculation of Magnetic Entropy Changes of Gadolinium from Magnetization Curves
The magnetization curves of gadolinium were measured with a vibrating sample magnetometer, from which the function M(H,T) was obtained using two-step least square fitting. Then magnetic entropy changes can be calculated. These works can provide the perliminary information needed for the design of magnetic refrigerator.
Behavior of Core Loss in Nanocrystalline Fe73.5Cu1Nb3Si13.5B9 Alloy with High Br
In the ranges of f=10—20000Hz and Bm=0.1—1.0T, the core loss has been measured for nanocrystalline Fe73.5Cu1Nb3Si13.5B9 alloy with high Br. The total power loss was decomposed into the sum of the classical eddy current loss, the hysteresis loss and the excess loss. The results show that the change of the total loss per cycle with frequency clearly shows a nonlinear behavior, which has been described in terms of Bertotti's statistical theory of loss. The frequency range examined can nearly be divided into two intervals, in which there exist two different describing ways.
Study of the Anisotropy of Microwave Electromagnetic Parameters of Polycrystalline Iron Fiber Absorber
Based on Maxwell equations, the theoretical formulas of microwave electromagnetic parameters of polycrystalline iron fiber absorber are dervied. The anisotropy of microwave electromagnetic parameters of polycrystalline iron fiber absorber is explained by use of numerical calculations. Some samples of fiber orientation have been produced and their electromagnetic parameters have been tested, the results confirm the anisotropy of electromagnetic parameters. Both of the theoretical and experimental results demonstrate that the axial permeability of polycrystalline iron fiber is greater than its radial permeability, and the axial permittivity of polycrystalline iron filber is greater than its radial permittivity.
Low Field Giant Magnetoresistance Behavior in Co/Cu92Mn8/Co Structures
Magneto-Optic Properties of Pt/Co/Pt/Ni Multilayers
The Giant Magneto-Impedance Effect of Current-Annealed Fe-Based Ribbons
Effect of Different Wheel Speed on Magnetic Properties of Nd8Fe85Mo1B6
Quantum Phase Transition in a Bilayer Heisenberg Antiferromagnet
Giant Magneto-Impedance Effect in Amorphous CoFeNiNbSiB Alloy Ribbon
Magnetic Properties of Nanostructured SmCo/FeCo Multilayers
The dependence of reduced remanence (Mr/Ms) and coercivity of Sm22Co78/Fe65Co35 bilayer and Sm22Co78/Fe65Co35/Sm22Co78 triple-layer films on Fe65Co35 soft-magnetic layer thickness d, was systematically investigated. All the hysteresis loops of the films exhibited a single-phase behavior, reflecting a strong exchange coupling between soft-and hard-magnetic phase. Mr/Ms showed a monotonic increase with increasing Fe65Co35 thickness d, and the coercivity would show a peak with increasing d. From the plot of ΔM versus applied field H, it is shown that the positive profile decreases and the negative interaction profile increases with the increase of interfaces between soft-and hard-layers.
Magnetic Properties and Giant Magnetoimpednce Effects of FeCuNdSiB Single Layered and Sandwiched Films
Magnetic Properties of Fe- and FeNi-Based Amorphous Composite Ribbons
Amorphous Fe78Si9B13 and (FeNiCr)78 (SiB)22 ribbons and their composite ribbons were made by a double-chamber-crucible technique. Ms-T curves and hysteresis loops of the lap-wound-cores of the two ribbons and composite ribbons were measured. The hysteresis loop of the lap-wound-cores was waist-like, and was closed but not equal to the average of the two components. For the composite ribbon cores, their Ms-T curve was practically the average of the two components. However, their hysteresis loop was no longer waist-like, but a flat one. These changes of the hysteresis loops of the lap-wound-cores and composite cores were suggested to result from the internal stress induced by the difference of the thermal expansion and magneto-striction of the two components.
Exchange Coupling in Ni81Fe19/Cr82Al18 Bilayers
Macroscopic Quantum Effects in Single Crystal Dy (Fe0.8Al0.2)2
Magnetization Reveral Behavior and Magnetic Viscosity of Nanocomposite Nd3.6Pr5.4Fe83Co3B5
The Study of the Structural, Magnetic and Magneto-Optical Properties of (Pt3Co)1-xNix Alloy Films
The Magnetic and Magneto-Optic Properties of the Amorphous TbCo/Si Multilayers
Crystallization Dynamics and Magnetoresistance of La0.7Ca0.3MnO3 Synthesized by Mechanical Alloying
Study on Ni80Fe20/Al2O3/Co Magnetic Tunnel Junctions
Oscillating Behavior of Magnetization in Pd/Fe and Dilute PdFe/Fe Multilayers
Formation of Multi-Branched Domains and the Calculation of Their Fractal Dimension
A “low-bias-field method” was proposed to form single multi-branched domains (MBDs) in garnet bubble films. The formation of MBDs is related to the nucleation of vertical Bloch lines (VBL) in their domain walls. With the decrease of the static bias-field Hb from the “critical static bias field for multi-branched expansion” H[d], the corresponding MBDs formed become more and more complex, accompanying the appearance of several kinds of hard domains. The fractal geometry was introduced into the study of MBDs. THe curved and branched patterns patterns of MBDs have been quantitatively described by the “line-measuring dimension” Dline, which is associated with the nucleation of VBL in their domain walls.
Magnetostriction of TbyDy1-y(Fe1-xTx)2(T=Al,Mn) and Their Intrinsic Magnetostrictive Properties
Magnetostriction of TbyDy1-x(Fe1-xTx)2(T=Al,Mn) single crystals, prepared by the MCGS-3 CZ instrument, was investigated. The intrinsic magnetostrictive properties were derived by fitting method of X-ray diffraction patterns of polycrystal samples prepared by arc-melting method. The substitution of AL, Mn for Fe lowers the saturation field and magnetocrystalline anisotropic energy. The intrinsic magnetostriction, λ111, decreases with increasing amount of Al or Mn. For Tb0.5Dy0.5(Fe0.9Mn0.1)2 single crystals,a large magnetostriction and high d33 can be obtained under the compressive stress of 12—26 MPa.
Magnetostriction Effect in (La1-xPrx)2/3Sr1/3MnO3 Perovskites
Magnetostriction in (La1-xRx)2/3Sr1/3MnO3 at Room Temperature
Structure and Magnetic Properties of Melt-Spun Pr(Fe1-xCox)2 Alloys
Magnetostriction of (La1-yTby)0.67Sr0.33MnO3 Perovskite
Properties of Magnetostatic Wave Propagating in YIG Waveguide Under Inclined Magnetization
A Model of Microwave Loss Due to Spin Wave Resonance in Grain-Surface-Layers
Magneto-Optical and Magnetic Properties of MnBiAl Thin Films
Studies on A Freshwater Magnetotactic Coccus
We report a previously undescribed magnetic coccus, designated NMC-1, that was present in surface sediments collected from the pool in Nanjing suburbs. They orientated and navigated along geomagnetic field lines. Transmission electron microscope photographs showed that the NMC-1 contained over ten magnetosomes. The individual mature crystal was 70nm in length and 40nm in width, which were within the calculted stability field for single-domain magnetite. The energy profile of X-rays was collected after electron excitation of the magnetosomes within a single cell. Iron was the predominant detectable element in the particles. Electron diffraction pattern indicated the magnetosomes are single crystals.
The Influence of Particle Size on Magneto-Optical Kerr Effect in Fe45Ag55 Granular Films