Particle size dependence of the magnetic properties of ultrafine granular films

S. H. Liou, C. L. Chien

Research output: Contribution to journalArticle

47 Scopus citations

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 Fe 60(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.

Original languageEnglish (US)
Pages (from-to)4240-4242
Number of pages3
JournalJournal of Applied Physics
Volume63
Issue number8
DOIs
StatePublished - 1988

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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