Particle size dependence of the magnetic properties of ultrafine granular films

S. H. Liou; C. L. Chien

doi:10.1063/1.341126

Particle size dependence of the magnetic properties of ultrafine granular films

S. H. Liou, C. L. Chien

Research output: Contribution to journal › Article › peer-review

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 language	English (US)
Pages (from-to)	4240-4242
Number of pages	3
Journal	Journal of Applied Physics
Volume	63
Issue number	8
DOIs	https://doi.org/10.1063/1.341126
State	Published - 1988
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy

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10.1063/1.341126

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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 M{\"o}ssbauer spectroscopy. The value of the magnetic anisotropy energy is found to be much larger than that due to magnetocrystalline anisotropy.",

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year = "1988",

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AU - Liou, S. H.

AU - Chien, C. L.

PY - 1988

Y1 - 1988

N2 - 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.

AB - 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.

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JF - Journal of Applied Physics

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Particle size dependence of the magnetic properties of ultrafine granular films

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