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Title: Novel nanophysics in antiferromagnetic Heisenberg chains

Abstract

Recently, thermoinduced magnetization (TiM) has been predicted to lead to ferromagnetic properties in nanoparticles of antiferromagnetic materials below the ordering temperature. Specifically, the susceptibility is found to increase linearly as the temperature is increased. In this paper, the magnetic properties of linear chains of three-dimensional classical Heisenberg spins are calculated both analytically and using Monte Carlo techniques. TiM is shown to be associated with the ordering of the spins induced by a single-site uniaxial anisotropy, and the per-spin susceptibility is found to be approximately independent of the number of spins in the chain. Finally, for large anisotropies, TiM is shown analytically to be associated with the thermal fluctuations of individual spins, in contrast to current theories.

Authors:
 [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Computational Sciences
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1361275
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 103; Journal Issue: 7; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Antiferromagnetism; Magnetic anisotropy; Magnetic susceptibilities; Nanoparticles; Anisotropy

Citation Formats

Brown, G. Novel nanophysics in antiferromagnetic Heisenberg chains. United States: N. p., 2008. Web. doi:10.1063/1.2828718.
Brown, G. Novel nanophysics in antiferromagnetic Heisenberg chains. United States. doi:10.1063/1.2828718.
Brown, G. Fri . "Novel nanophysics in antiferromagnetic Heisenberg chains". United States. doi:10.1063/1.2828718. https://www.osti.gov/servlets/purl/1361275.
@article{osti_1361275,
title = {Novel nanophysics in antiferromagnetic Heisenberg chains},
author = {Brown, G.},
abstractNote = {Recently, thermoinduced magnetization (TiM) has been predicted to lead to ferromagnetic properties in nanoparticles of antiferromagnetic materials below the ordering temperature. Specifically, the susceptibility is found to increase linearly as the temperature is increased. In this paper, the magnetic properties of linear chains of three-dimensional classical Heisenberg spins are calculated both analytically and using Monte Carlo techniques. TiM is shown to be associated with the ordering of the spins induced by a single-site uniaxial anisotropy, and the per-spin susceptibility is found to be approximately independent of the number of spins in the chain. Finally, for large anisotropies, TiM is shown analytically to be associated with the thermal fluctuations of individual spins, in contrast to current theories.},
doi = {10.1063/1.2828718},
journal = {Journal of Applied Physics},
number = 7,
volume = 103,
place = {United States},
year = {2008},
month = {1}
}

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