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Title: Magnetic relaxation in a suspension of antiferromagnetic nanoparticles

Abstract

A kinetic model is proposed to describe the low-frequency magnetodynamics of antiferromagnetic nanoparticles suspended in a fluid. Because of their small size, apart from an anisotropic magnetic susceptibility typical of antiferromagnets, these particles also have a constant magnetic moment caused by sublattice decompensation. An orientational crossover takes place in such a nanosuspension (colloid) when magnetized by a constant field: the axes of easy particle magnetization that were initially aligned along the field become oriented perpendicularly. This effect changes significantly the characteristics of the system's magnetic response: the dynamic susceptibility spectrum and the relaxation time in a pulsed field.

Authors:
 [1]
  1. Russian Academy of Sciences, Ural Division, Institute of Continuous Media Mechanics (Russian Federation)
Publication Date:
OSTI Identifier:
21244153
Resource Type:
Journal Article
Journal Name:
Journal of Experimental and Theoretical Physics
Additional Journal Information:
Journal Volume: 107; Journal Issue: 3; Other Information: DOI: 10.1134/S1063776108090112; Copyright (c) 2008 Pleiades Publishing, Ltd; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7761
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ANISOTROPY; ANTIFERROMAGNETISM; COLLOIDS; MAGNETIC MOMENTS; MAGNETIC SUSCEPTIBILITY; MAGNETIZATION; NANOSTRUCTURES; PARTICLES; RELAXATION; RELAXATION TIME; SPECTRA; SUSPENSIONS

Citation Formats

Raikher, Yu. L., E-mail: raikher@icmm.ru, and Stepanov, V I. Magnetic relaxation in a suspension of antiferromagnetic nanoparticles. United States: N. p., 2008. Web. doi:10.1134/S1063776108090112.
Raikher, Yu. L., E-mail: raikher@icmm.ru, & Stepanov, V I. Magnetic relaxation in a suspension of antiferromagnetic nanoparticles. United States. https://doi.org/10.1134/S1063776108090112
Raikher, Yu. L., E-mail: raikher@icmm.ru, and Stepanov, V I. 2008. "Magnetic relaxation in a suspension of antiferromagnetic nanoparticles". United States. https://doi.org/10.1134/S1063776108090112.
@article{osti_21244153,
title = {Magnetic relaxation in a suspension of antiferromagnetic nanoparticles},
author = {Raikher, Yu. L., E-mail: raikher@icmm.ru and Stepanov, V I},
abstractNote = {A kinetic model is proposed to describe the low-frequency magnetodynamics of antiferromagnetic nanoparticles suspended in a fluid. Because of their small size, apart from an anisotropic magnetic susceptibility typical of antiferromagnets, these particles also have a constant magnetic moment caused by sublattice decompensation. An orientational crossover takes place in such a nanosuspension (colloid) when magnetized by a constant field: the axes of easy particle magnetization that were initially aligned along the field become oriented perpendicularly. This effect changes significantly the characteristics of the system's magnetic response: the dynamic susceptibility spectrum and the relaxation time in a pulsed field.},
doi = {10.1134/S1063776108090112},
url = {https://www.osti.gov/biblio/21244153}, journal = {Journal of Experimental and Theoretical Physics},
issn = {1063-7761},
number = 3,
volume = 107,
place = {United States},
year = {Mon Sep 15 00:00:00 EDT 2008},
month = {Mon Sep 15 00:00:00 EDT 2008}
}