Preparation and Magnetic Properties of Fe0.7Co0.3–SiO2 Granular Alloy Solid

Abstract

The Fe0.7Co0.3–SiO2 granular alloy solid has been prepared using a sol–gel method, and investigated by X‐ray diffraction (XRD), transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM). The effective magnetic anisotropy KE has been measured by the law of approach to saturation (LATS). The evolution of the magnetic properties for the granular alloy solid during reducing is described and explained by means of particle size distribution and superparamagnetic behaviour. When the measuring temperature changes from 100 to 800 K, the variations of saturation magnetization, effective magnetic anisotropy and coercivity of the Fe0.7Co0.3–SiO2 granular solid are much smaller than those of existing magnetic recording media. The Fe0.7Co0.3–SiO2 granular alloy solid has a potential for application in high density magnetic recording media, which can be used in a wide temperature range.

Synthesis, Structure, and Magnetic Properties of Co, Ni, and Co−Ni Alloy Nanocluster-Doped SiO2 Films by Sol−Gel Processing

“…The sol−gel technique is able to control both cluster and matrix composition. From the point of view of magnetic applications, this technique has been used to synthesize alloy nanoclusters involving mainly transition metals, e.g., Nd−Fe, Fe−Cr, Fe−Ni, Cu−Ni, and Fe−Co . In this paper, we report the sol−gel preparation and systematic structural and compositional analysis of a series of nanoclusters consisting of the ferromagnetic 3d elements Co and Ni and their intermediate alloys embedded in a silica host.…”

Au−Cu Alloy Nanocluster Doped SiO2 Films by Sol−Gel Processing

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