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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...
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...
For toggle MRAM, the free layer is a synthetic antiferromagnet (SAF) that must have specific magnetic properties such as: low magnetostriction, a repeatable saturation field (Hsat) that can be adjusted within a specific range, and a well-defined and reproducible intrinsic anisotropy axis. The results from fully-functional Mb-scale MRAM circuits using CoFeB SAF free layers optimized for toggle switching...
In this paper (1) the development of a stress dependent tetragonal (uniaxial to lowest order) anisotropy in the Galfenol (iron-gallium) alloys by stress annealing is described (2) their magnetic, magnetostrictive and anisotropic properties by fitting magnetostriction and magnetoelastic data to a simple magnetization rotation model are given, and (3) the amount of built-in stress by stress annealing...
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...
This article presents a detailed study of the local magnetic behaviour in TbCo2/FeCo films near the spin reorientation transition (SRT), and explains the behaviour of giant magnetostrictive (GMS) actuators under different driving conditions. 25times(TbCo2 5 nm/FeCo 5 nm) GMS thin films were deposited onto 3times25 mm2, 50 mum Si beams using RF sputtering method. The magnetoelastic coefficient was...
This paper focuses on the preparation and characterization of 2 new Fe-Ga-based alloys: (i) 3-D shaped Fe100-x(Ga,Al)x polycrystalline magnetostrictive alloys, and (ii) Fe100-x(Ga,Al)x composite materials, consisting of nano-and micropowders of active material embedded into a polymer matrix. Thin plates have been prepared by Cu mould casting technique, and magnetostriction has been measured by the...
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...
A model is presented to calculate the dynamic hysteresis behaviour of the magnetostriction in electrical steel under 1-D sinusoidal magnetisation. The input of the model is one period of the 1-D induction wave. On this induction wave, a fast Fourier transform (FFT) is performed, of which the frequency components are fed to the input of a neural network (NN).This neural network calculates the frequency...
In this work, we fabricated multi-component pseudobinary TbxDy0.7-xPr0.3(Fe0.9B0.1)1.93 system and their epoxy-bonded composites and their magnetic hysteresis loops and magnetostrictive properties for x varying within the anisotropy minimization region of 0.16-0.25 was studied.
A cantilevered actuator is fabricated in this study by sputter deposition using amorphous Fe72Si14B14 as the magnetostrictive material. The displacement of the cantilever is observed with applying the magnetic field of 10 kA/m to the width direction of the cantilever. Results show that the displacement of the cantilever increased with decreasing substrate thickness, and has a peak value at the thickness...
Magnetomechanical coupling factor, piezomagnetic d-constant and magnetic permeability are reported as a function of magnetic field and applied stress for stress annealed Fe-Ga and Fe-Al alloys. Magnetic field dependences of the samples were measured as a function of the intrinsic saturation flux density (Js), lowest order cubic anisotropy coefficient (Kcubic), uniaxial anisotropy lowest order coefficient...
This article report on the effect of substituting other transition metals on the magnetostriction and Curie temperature of R(Zn1-xFex) (R=Tb, Dy) polycrystalline alloys. The X-ray diffraction analysis confirmed that the DyZn1-xFex alloys consisted of nearly a single Dy(Zn,Fe) phase with the CsCl-type cubic structure in the range 0<x<0.15. When x>0.15, they consist of a Dy(Zn,Fe) phase 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...
This paper reports the magnetoelectric properties of CoFe2O4-BaTiO3 core-shell structure composites. Crystalline structures of the composites were investigated by X-ray diffractometer (XRD). Magnetic properties were studied using a pulse field magnetometer. Magnetostriction was measured using strain gauge method. AC susceptibility and ME coefficient were investigated using lock-in technique in which...
The magnetostriction and magnetisation of Hiperco 50 soft magnetic material composed of 49wt%Fe, 49%Co, and 2%V are measured simultaneously using an optical technique with a pickup coil. A butterfly shape is observed in the magnetostrictive strain vs. applied field curve at room temperature. This suggests that the alloy has a very low coercive field which is confirmed by the DC hysteresis loop. Magnetostrictive...
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