Magnetic relaxation of iron nanoparticles

Ralph Chamberlin; Keith D. Humfeld; Dorothy Farrell; Saeki Yamamuro; Yumi Ijiri; Sara A. Majetich

doi:10.1063/1.1452194

Magnetic relaxation of iron nanoparticles

Ralph Chamberlin, Keith D. Humfeld, Dorothy Farrell, Saeki Yamamuro, Yumi Ijiri, Sara A. Majetich

Physics

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

29 Scopus citations

Abstract

The magnetic relaxation of highly diluted monodisperse iron-based particles was measured between 10 ^-5 and 10 ⁴s, for different temperatures and particle sizes. The decay over a very broad range of times indicated a distribution of energy barriers remained despite the narrow range of sizes. Many features of this decay could be explained using a percolation model of particles with weak dipolar interactions. However, this model did not predict the abrupt change in the decay rate at long times, which was observed for samples of both 8.0 and 5.5 nm particles below a threshold temperature.

Original language	English (US)
Pages (from-to)	6961-6963
Number of pages	3
Journal	Journal of Applied Physics
Volume	91
Issue number	10 I
DOIs	https://doi.org/10.1063/1.1452194
State	Published - May 15 2002

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1063/1.1452194

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T1 - Magnetic relaxation of iron nanoparticles

AU - Chamberlin, Ralph

AU - Humfeld, Keith D.

AU - Farrell, Dorothy

AU - Yamamuro, Saeki

AU - Ijiri, Yumi

AU - Majetich, Sara A.

PY - 2002/5/15

Y1 - 2002/5/15

N2 - The magnetic relaxation of highly diluted monodisperse iron-based particles was measured between 10 -5 and 10 4s, for different temperatures and particle sizes. The decay over a very broad range of times indicated a distribution of energy barriers remained despite the narrow range of sizes. Many features of this decay could be explained using a percolation model of particles with weak dipolar interactions. However, this model did not predict the abrupt change in the decay rate at long times, which was observed for samples of both 8.0 and 5.5 nm particles below a threshold temperature.

AB - The magnetic relaxation of highly diluted monodisperse iron-based particles was measured between 10 -5 and 10 4s, for different temperatures and particle sizes. The decay over a very broad range of times indicated a distribution of energy barriers remained despite the narrow range of sizes. Many features of this decay could be explained using a percolation model of particles with weak dipolar interactions. However, this model did not predict the abrupt change in the decay rate at long times, which was observed for samples of both 8.0 and 5.5 nm particles below a threshold temperature.

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JO - Journal of Applied Physics

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Magnetic relaxation of iron nanoparticles

Abstract

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