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Sy-Hwang Liou Publications
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Document Type
Article
Date of this Version
April 1988
Abstract
Magnetic granular solids consist of ultrafine metal granules of nanometer sizes embedded in an insulating medium. The magnetic properties are dictated by the microstructure such as particle size, metal volume fraction, which are process controlled. We report the results of a series of granular Fe60(SiO2)40 films in which the particle size has been systematically varied. The magnetic coercivity, ranging from 500 to 2200 Oe, increases with particle size. The ferromagnetic-superparamagnetic transition had been studied by SQUID magnetometry and Mössbauer spectroscopy. The value of the magnetic anisotropy energy is found to be much larger than that due to magnetocrystalline anisotropy.
Comments
Published by American Institute of Physics. J. Appl. Phys. 63, 4240 (1988). ©1988 American Institute of Physics. Permission to use. Journal home page = http://jap.aip.org/jap/.