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In this work, the reflected part of a spin-polarized electron beam is examined. A spin-polarized electron beam was obtained from a strained GaAs-type source by optically pumping the crystal with circularly polarized light. The beam was incident at a 45deg angle with respect to the surface of the ferromagnetic film. To get the maximal spin motion of the reflected electrons, it is necessary to choose...
This paper reports on magnetic properties of bulk polycrystalline samples of ln2O3 doped with a wide range of TM ions. Phase purity of the samples was analyzed by means of X-ray diffraction and conductivity was also measured using a four-probe technique. From magnetization-temperature curves (M-T curves), it was shown that Cr doped samples was found to be paramagnetic throughout the whole temperature...
A new method is developed to measure the magnetizations in each layer of a multi-layered garnet film. This method combines a single VSM and multiple FMR measurements to completely characterize the magnetic properties of layers. This method can be immediately extended to the case of multiple layers or different materials, as long as the requirement for resolving the FMR absorption peaks for different...
Iron-rich rare-earth intermetallic compounds of the type R3(Fe,M)29 3:29 have been drawing considerable attention in the recent years owing to their projected applications as permanent magnet materials. They have been reported to form in monoclinic structure with A2/m space group.All the compounds have been found to form in 3:29 phase as the major phase with 1:12 phase as the secondary phase and traces...
Since the Nd3(Fe,Ti)29 phase with monoclinic symmetry and space group A2/m was discovered, much attention has been paid to the substitution of Co for Fe in R3(Fe,TM)29 intermetallic compounds. Recently, it has been shown that in 3:29 compounds Co substitution has a significant effect on their structural and magnetic properties, especially on the nature of the magnetocrystalline anisotropy. Normally,...
The authors report on current-induced domain wall (DW) movement in synthetic spin valves. The high exchanged field in synthetic antiferromagnets (SAF) keeps the the magnetization of the pinned layer unchanged during the measurement. Thus, the GMR measurement allows to an accurate determination of the DW position and displacement.
In this work, preparation and characterization of magnetic metallic membranes with well ordered nanoholes that gives rise to particular magnetization process is focused. This nanostructure has been achieved by controlled replica/antireplica processes starting from highly ordered nanoporous alumina membrane.
The magnetic properties, in particular, the thickness dependence of the magnetization of ultrathin Fe3O4 films grown on GaAs(100). The in-plane hysteresis loop from the VSM were measured for samples with various thickness in different field orientation. In the directions of [011 ] and [001 ], the remanence ratio increases with increasing film thickness and more distinctly during the change from 6...
This paper presents a survey of the effects of transition metal doping on the damping properties of thin films of Permalloy (Ni80Fe20). For many applications requiring high speed or high data rates, the magnetization of Permalloy is underdamped, and this results in magnetization precession with a lifetime of a few nanoseconds. In these materials, faster switching could be accomplished by increased...
This study aims to determine the role of electron scattering in the damping mechanisms of magnetization and electrical resistivity of Permalloy thin films at varying temperatures. The complex dynamic susceptibility of the magnetic thin films are measured using ferromagnetic resonance technique. The resistivity follows a quadratic law with temperature which is attributed to electron-electron and electron-magnon...
In this paper, the effect of substituting Fe partially by the 4d element Nb on the structural and magnetic properties of Tb0.27Dy0.73Fe2 is reported. Polycrystalline compounds of Tb0.27Dy0.73Fe2-xNbx (x = 0, 0.05, 0.1 and 0.2) were prepared by arc melting the constituent elements (rare earths-99.9 % pure, Fe and Nb -99.95 % pure) in an arc furnace under argon atmosphere. The ingots were annealed in...
In the present study, A series of polycrystalline chromium-substituted cobalt ferrite samples with compositions of CoCrxFe2-xO4 were prepared by standard powder ceramic techniques. The microstructure and final composition of the samples were characterized using a scanning electron microscope with energy-dispersive X-ray spectroscopy (EDX). The crystal structure of the samples was determined by X-ray...
The existence of diamagnetic and ferromagnetic spin moment behaviors at nanoscale in Ag nanoparticles is reported. Ag nanoparticles were fabricated by thermal evaporation method and magnetization measurements were performed using a quantum design physical properties measurement system (PPMS). X-ray diffraction and atomic force microscope were used to characterize the sample quality and size distribution...
This paper looks at the in vitro heating of low viscosity ferrofluids containing nanoparticles with elevated magnetization established by a 200 kHz AC magnetic field. It is found that controlling the concentration of the nanoparticles in solution the cPEG coated Fe nanoparticles improve the effectiveness of heating in vitro within the required limits.
In the present article, we report the effect of Mn substitution for Fe on the temperature dependence of magnetization, AC magnetic susceptibility and electrical resistivity of Ho0.85Tb0.15Fe2.The compounds Ho0.85Tb0.15Fe(2-x)Mnx [x = 0-2] form in single phase with cubic Laves phase structure and the lattice parameter increases with the addition of Mn. The Curie temperature decreases with increasing...
In this work, the effects of post-annealing of CoCrPt-SiO2/Ru perpendicular magnetic recording media on magnetic properties and microstructure have been studied. CoCrPt-SiO2/Ru/Ta thin films were deposited on Si substrate by a dc magnetron sputtering method at room temperature and followed by post-annealing for 30 minutes in the range of 100 ~ 240degC. Magnetic properties such as magnetization, coercivity...
One of the main difficulties in designing the effectively working magnetic cell is the fact that the amplitude of the current-driven torque acting on the magnetization of the free layer in a single-barrier MTJ is usually too small. To overcome this difficulty, we suggest introducing magnetic impurities inside the barrier in order to create resonance electron states inside it. We consider an MTJ with...
This paper presents initial results on the correlations between the magnetic properties and microstructure of self-assembled (l-x)CoFe2O4-xPbTiO3 multiferroic thin films. The structure and properties of the two-phase nanocomposite films, grown epitaxially by pulsed-laser deposition, were found to vary with the orientation of the single crystal SrTiO3 substrates. The room temperature magnetization...
The authors synthesized ultra-small magnetite (Fe3O4) nanoparticles using aqueous coprecipitation. The crystal structure of the samples was analyzed by X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). The magnetic properties of the magnetite nanocrystals were investigated using a SQUID magnetometer.
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