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A detailed characterization and analysis of the microwave properties of a set of nanogranular (Fe0.7Co0.3)71B22Ni7 films under an applied magnetic dc field ranging from 0 to 45 kA/m is presented. A full microwave characterization of the films is performed up to 20 GHz using a vector network analyzer (VNA) connected to a matched microstripline or coplanar waveguide, loaded with the films. The evolution...
The study of magnetization on beta-FeSi2 nanoparticles with particle size of 15 nm, 22 nm and 75 nm confirmed that semiconducting beta-FeSi2 became superparamagnetic as it was reduced into nanoparticles. The superparamagnetic characteristics were identified by the irreversible magnetization and blocking temperatures of FC and ZFC measurements. The correlations among blocking temperature, anisotropic...
This paper describes the relations among anisotropic field(Hk), sheet resistance (Rs) and power losses in Co-Pd-B-O nano-granular films with various compositions and discuss the mechanism of the noise suppression effect in the case of magnetic thin films. Results demonstrate suitable nano-granular magnetic thin films useful for a noise suppressor in semi-microwave bands.
Amorphous Fe73.5Cu1Nb3Si15.5B7 ribbons that are 2 mm wide and 20 mum thick were prepared by the continuous stress annealing-Joule heating (CSA-JH) method in air under tensile stresses of 50 to 175 MPa. Processing parameters such as the supplied current density and the moving velocity were varied. The ribbons were annealed at various conditions, and the relationship between the developed anisotropy...
The aim of this paper is to investigate FeCuSiBNb nanocrystalline microwires as an alternative to amorphous Co-based high-permeability microwires. The anisotropy is determined through static characterization from 20degC to 250degC using a VSM (Vibrating Sample Magnetometer). The properties are comparable in term of softness, but are superior in terms of saturation magnetostriction and thermal stability...
In this study, we investigated that both magnetic switching and tunneling magnetoresistance (TMR) ratio of MTJs with the NiFeSiB free layer. The junctions were fabricated by a photolithographic patterning procedure and ion beam etching. A magnetic field of 100 Oe was applied during deposition to induce the uniaxial magnetic anisotropy in ferromagnetic layer.The NiFeSiB layers were used to substitute...
In this work, Fe65Co35 alloy which has maximum saturation magnetization (Ms) among all metal magnetic materials was chosen to make Fe65Co35-SiO2 granular films, and the magnetic properties in whole composition were studied. The results show that good high frequency soft magnetic films were obtained by carefully controlling the microstructure. A serious (Fe65Co35)x(SiO2)1-x granular films are fabricated...
Potential use of FeCo alloys in high moment inductive writer heads is limited by large values of magnetostriction and coercivity. Recent work shows that metallic seed layers, including Ru, improved the soft properties of sputter-deposited FeCo by reducing the grain size of the deposited FeCo films. We carried out a series of experiments to investigate the effect of Ru, Ta and NiFe seed layers and...
The magnetic anisotropy properties of (Ga, Mn)As epilayers are dependent on strain, thickness, substrates orientation, measurement temperature and shape. Systematic study magnetic anisotropy is important owing to they will strongly influence its application of spintronic devices. The effect of low-temperature annealing on the lattice constant and magnetic properties of ternary (Ga, Mn)As grown on...
A detailed study of the anomalies in the ferromagnetic properties of the RNi4Ga compounds with R = Sm, Gd and Tb. Heat capacity measurement of these samples also show anomalies at low temperatures in addition to the peak corresponding to TC. Other magnetic properties such as magnetisation, coercivity, magnetic anisotropy and magnetic domain walls of the samples were also studied.
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,...
In this paper, the recording performance of two types of media are compared by calculating the head field distribution of an 80 nm wide write pole in conjunction with a soft magnetic underlayer. The maximum effective field was inclined 15deg from the perpendicular axis. The effective head field gradient was a maximum when the head field was inclined 35deg from the perpendicular. Composite media have...
In this paper, we introduce the unique newly material, the hcp disordered Co-Ir alloy with negative uniaxial magnetic anisotropy, and propose a new concept of the ECC media using this new CoIr-SiO2 granular film instead of conventional soft layer material. In real magnetic writing, negative-Kugrain part plays a role of SUL function. Co-Ir alloys with negative-Kugrain shows soft magnetism in the...
L10-FePt is a promising material for ultra high density magnetic recording media due to its high magnetocrystalline anisotropy (Ku). However, the switching field (Hsw) of the L10-FePt particle is too large to write by the currently used write head. Hard/soft stacked media are proposed to solve this problem. Recently, we demonstrated that the coercivity of isolated FePt particles can be reduced by...
In this work, magnetic properties and structure of granular type tilted media of (FePt-Fe3Pt )/MgO are investigated. The reason for choosing Fe3Pt is because the ordered Fe3Pt alloy thin films are found to exhibit large magnetic anisotropy (Kl and K2 are -4x106 erg/cc and 2x107 erg/cc) at room temperature, respectively, and thus a composite grain of FePt and Fe3Pt is expected to tilt the easy axis,...
One of the main challenges in magnetic recording is to obtain a sufficient high thermal stability and at the same time a good writeability of the media. Recently, composite media and exchange spring media were proposed in order to shift the problem of writeability to higher areal densities. A similar concept can be applied to a recently proposed recording media called percolation media. In this paper,...
Multilayered Co/Pd nanowire array were obtained from atomic image projection electron beam lithography (AIPEL) and combined novel etching technique using amorphous Si layer. The role of dipolar interaction in magnetic anisotropy of the nanowire array was studied. The structural information were obtained by HR-TEM, XRD, SEM and AFM. The magnetic properties were measured by SQUID and vibrating sample...
The influence of magnetostatic interactions on a wire domain structure is investigated here using the simplest possible situation: a) the wire has perfect cylindrical shape, b) the magnetic anisotropy is uniaxial with the easy anisotropy axis parallel to the wire axis, c) the material parameters of the wire correspond to a soft magnetic case, Ms2GtK1, where Ms is the saturation magnetization and...
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