Percolation, relaxation halt, and retarded van der Waals interaction in dilute systems of iron nanoparticles

Ralph Chamberlin; J. Hemberger; A. Loidl; K. D. Humfeld; D. Farrell; S. Yamamuro; Y. Ijiri; S. A. Majetich

doi:10.1103/PhysRevB.66.172403

Percolation, relaxation halt, and retarded van der Waals interaction in dilute systems of iron nanoparticles

Ralph Chamberlin, J. Hemberger, A. Loidl, K. D. Humfeld, D. Farrell, S. Yamamuro, Y. Ijiri, S. A. Majetich

Physics

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2 Scopus citations

Abstract

We find three unanticipated features in the magnetic response of dilute systems of highly monodisperse Fe nanoparticles. Above a spin freezing temperature (formula presented) the remanent magnetization relaxes smoothly to zero, but below (formula presented) the relaxation halts abruptly at a nonzero value. The distribution of relaxation rates changes at a percolation temperature (formula presented) consistent with chainlike structures above (formula presented) and three-dimensional clusters below (formula presented) The blocking temperature (formula presented) varies inversely proportional to particle diameter, opposite to the behavior of the Néel-Brown model for individual domains, but consistent with a type of Casimir-Polder interaction expected between dilute nanometer-scale particles.

Original language	English (US)
Pages (from-to)	1-4
Number of pages	4
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	66
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevB.66.172403
State	Published - Jan 1 2002

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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abstract = "We find three unanticipated features in the magnetic response of dilute systems of highly monodisperse Fe nanoparticles. Above a spin freezing temperature (formula presented) the remanent magnetization relaxes smoothly to zero, but below (formula presented) the relaxation halts abruptly at a nonzero value. The distribution of relaxation rates changes at a percolation temperature (formula presented) consistent with chainlike structures above (formula presented) and three-dimensional clusters below (formula presented) The blocking temperature (formula presented) varies inversely proportional to particle diameter, opposite to the behavior of the N{\'e}el-Brown model for individual domains, but consistent with a type of Casimir-Polder interaction expected between dilute nanometer-scale particles.",

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AU - Chamberlin, Ralph

AU - Hemberger, J.

AU - Loidl, A.

AU - Humfeld, K. D.

AU - Farrell, D.

AU - Yamamuro, S.

AU - Ijiri, Y.

AU - Majetich, S. A.

PY - 2002/1/1

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N2 - We find three unanticipated features in the magnetic response of dilute systems of highly monodisperse Fe nanoparticles. Above a spin freezing temperature (formula presented) the remanent magnetization relaxes smoothly to zero, but below (formula presented) the relaxation halts abruptly at a nonzero value. The distribution of relaxation rates changes at a percolation temperature (formula presented) consistent with chainlike structures above (formula presented) and three-dimensional clusters below (formula presented) The blocking temperature (formula presented) varies inversely proportional to particle diameter, opposite to the behavior of the Néel-Brown model for individual domains, but consistent with a type of Casimir-Polder interaction expected between dilute nanometer-scale particles.

AB - We find three unanticipated features in the magnetic response of dilute systems of highly monodisperse Fe nanoparticles. Above a spin freezing temperature (formula presented) the remanent magnetization relaxes smoothly to zero, but below (formula presented) the relaxation halts abruptly at a nonzero value. The distribution of relaxation rates changes at a percolation temperature (formula presented) consistent with chainlike structures above (formula presented) and three-dimensional clusters below (formula presented) The blocking temperature (formula presented) varies inversely proportional to particle diameter, opposite to the behavior of the Néel-Brown model for individual domains, but consistent with a type of Casimir-Polder interaction expected between dilute nanometer-scale particles.

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Percolation, relaxation halt, and retarded van der Waals interaction in dilute systems of iron nanoparticles

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