Magnetic granular Fe-(SiO2) solids

C. L. Chien; Gang Xiao; S. H. Liou; J. N. Taylor; A. Levy

doi:10.1063/1.338892

Magnetic granular Fe-(SiO₂) solids

C. L. Chien, Gang Xiao, S. H. Liou, J. N. Taylor, A. Levy

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17 Scopus citations

Abstract

We have synthesized a series of granular Fe-SiO₂ solids consisting of Fe metal granules of nanometer sizes embedded in an insulating SiO₂ matrix. The ultrafine microstructures, revealed by TEM, are achieved by using a high-rate magnetron sputtering system. The magnetic properties of such solids are determined by the granular size and the metal volume fraction. Below the percolation threshold, isolated single-domain particles having large magnetic coercivity in the blocked state exhibit superparamagnetic relaxation, which has been studied by using SQUID magnetometry and Mössbauer spectroscopy. Above the percolation threshold, magnetic coercivity drops dramatically and the magnetic properties approach that of pure Fe. The anisotropy energy of the magnetic granules, much larger than that due to magnetocrystalline anisotropy, has been determined.

Original language	English (US)
Pages (from-to)	3311-3313
Number of pages	3
Journal	Journal of Applied Physics
Volume	61
Issue number	8
DOIs	https://doi.org/10.1063/1.338892
State	Published - 1987
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy

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10.1063/1.338892

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title = "Magnetic granular Fe-(SiO2) solids",

abstract = "We have synthesized a series of granular Fe-SiO2 solids consisting of Fe metal granules of nanometer sizes embedded in an insulating SiO2 matrix. The ultrafine microstructures, revealed by TEM, are achieved by using a high-rate magnetron sputtering system. The magnetic properties of such solids are determined by the granular size and the metal volume fraction. Below the percolation threshold, isolated single-domain particles having large magnetic coercivity in the blocked state exhibit superparamagnetic relaxation, which has been studied by using SQUID magnetometry and M{\"o}ssbauer spectroscopy. Above the percolation threshold, magnetic coercivity drops dramatically and the magnetic properties approach that of pure Fe. The anisotropy energy of the magnetic granules, much larger than that due to magnetocrystalline anisotropy, has been determined.",

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year = "1987",

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T1 - Magnetic granular Fe-(SiO2) solids

AU - Chien, C. L.

AU - Xiao, Gang

AU - Liou, S. H.

AU - Taylor, J. N.

AU - Levy, A.

PY - 1987

Y1 - 1987

N2 - We have synthesized a series of granular Fe-SiO2 solids consisting of Fe metal granules of nanometer sizes embedded in an insulating SiO2 matrix. The ultrafine microstructures, revealed by TEM, are achieved by using a high-rate magnetron sputtering system. The magnetic properties of such solids are determined by the granular size and the metal volume fraction. Below the percolation threshold, isolated single-domain particles having large magnetic coercivity in the blocked state exhibit superparamagnetic relaxation, which has been studied by using SQUID magnetometry and Mössbauer spectroscopy. Above the percolation threshold, magnetic coercivity drops dramatically and the magnetic properties approach that of pure Fe. The anisotropy energy of the magnetic granules, much larger than that due to magnetocrystalline anisotropy, has been determined.

AB - We have synthesized a series of granular Fe-SiO2 solids consisting of Fe metal granules of nanometer sizes embedded in an insulating SiO2 matrix. The ultrafine microstructures, revealed by TEM, are achieved by using a high-rate magnetron sputtering system. The magnetic properties of such solids are determined by the granular size and the metal volume fraction. Below the percolation threshold, isolated single-domain particles having large magnetic coercivity in the blocked state exhibit superparamagnetic relaxation, which has been studied by using SQUID magnetometry and Mössbauer spectroscopy. Above the percolation threshold, magnetic coercivity drops dramatically and the magnetic properties approach that of pure Fe. The anisotropy energy of the magnetic granules, much larger than that due to magnetocrystalline anisotropy, has been determined.

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Magnetic granular Fe-(SiO₂) solids

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