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Proceedings Paper

High-temperature magnetization and Mössbauer spectra of nanoparticles in a weak magnetic field
Author(s): Mikhail A Chuev
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Paper Abstract

High-temperature magnetic effects observed in the conventional 'low-frequency' magnetization measurements and Mössbauer spectra of nanoparticles are discussed in the framework of a general model for magnetic dynamics of ensemble of single-domain particles in which the uniform magnetization precession orbits are considered as stochastic states. Qualitative analysis and numerical calculations within the 'multilevel' model evidence for the existence of the asymptotic high-temperature behavior of the magnetization of an ensemble of particles in a weak magnetic field, which is earlier predicted to be different from the classical Langevin limit for ideal superparamagnetic particles. Based on this approach, a simplified three-level stochastic model is developed in order to describe the Mössbauer absorption spectra of an ensemble of magnetic nanoparticles in a weak magnetic field. In particular, this model predicts the appearance of 57Fe magnetic sextets with a small hyperfine splitting in a weak magnetic field and at high temperature, which look like effective "doublets" of lines often observed in experimental spectra.

Paper Details

Date Published: 26 February 2010
PDF: 12 pages
Proc. SPIE 7521, International Conference on Micro- and Nano-Electronics 2009, 75210P (26 February 2010); doi: 10.1117/12.854226
Show Author Affiliations
Mikhail A Chuev, Institute of Physics and Technology (Russian Federation)

Published in SPIE Proceedings Vol. 7521:
International Conference on Micro- and Nano-Electronics 2009
Kamil A. Valiev; Alexander A. Orlikovsky, Editor(s)

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