Novel nanophysics in antiferromagnetic Heisenberg chains

Brown, G.

doi:10.1063/1.2828718

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:

Brown, G. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Computational Sciences

Publication Date:: Fri Jan 18 00:00:00 EST 2008

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); USDOE Office of Science (SC), Basic Energy Sciences (BES); 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.

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                    Brown, G. Novel nanophysics in antiferromagnetic Heisenberg chains.  United States.  https://doi.org/10.1063/1.2828718

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                    Brown, G. Fri .  
"Novel nanophysics in antiferromagnetic Heisenberg chains".  United States.  https://doi.org/10.1063/1.2828718.  https://www.osti.gov/servlets/purl/1361275.

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@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         = {Fri Jan 18 00:00:00 EST 2008},

  month        = {Fri Jan 18 00:00:00 EST 2008}

}

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Works referenced in this record:

Anomalous Fluctuations in Phases with a Broken Continuous Symmetry
journal, January 2004

Zwerger, W.
Physical Review Letters, Vol. 92, Issue 2
DOI: 10.1103/PhysRevLett.92.027203

Thermoinduced Magnetization in Nanoparticles of Antiferromagnetic Materials
journal, May 2004

Mørup, Steen; Frandsen, Cathrine
Physical Review Letters, Vol. 92, Issue 21
DOI: 10.1103/PhysRevLett.92.217201

Intrinsic volume scaling of thermoinduced magnetization in antiferromagnetic nanoparticles
journal, October 2005

Brown, G.; Janotti, A.; Eisenbach, M.
Physical Review B, Vol. 72, Issue 14
DOI: 10.1103/PhysRevB.72.140405

Thermoinduced magnetization and uncompensated spins in antiferromagnetic nanoparticles
journal, July 2006

Madsen, Daniel Esmarch; Mørup, Steen
Physical Review B, Vol. 74, Issue 1
DOI: 10.1103/PhysRevB.74.014405

Magnetism in One-Dimensional Systems—The Heisenberg Model for Infinite Spin
journal, May 1964

Fisher, Michael E.
American Journal of Physics, Vol. 32, Issue 5
DOI: 10.1119/1.1970340

Uniform magnetic excitations in nanoparticles
journal, July 2005

Mørup, Steen; Hansen, Britt Rosendahl
Physical Review B, Vol. 72, Issue 2
DOI: 10.1103/PhysRevB.72.024418

Linear Magnetic Chains with Anisotropic Coupling
journal, August 1964

Bonner, Jill C.; Fisher, Michael E.
Physical Review, Vol. 135, Issue 3A
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Efficient Monte Carlo methods for the computer simulation of biological molecules
journal, June 1992

Bouzida, Djamal; Kumar, Shankar; Swendsen, Robert H.
Physical Review A, Vol. 45, Issue 12
DOI: 10.1103/PhysRevA.45.8894

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Similar Records

Title: Novel nanophysics in antiferromagnetic Heisenberg chains

Abstract

Citation Formats

Anomalous Fluctuations in Phases with a Broken Continuous Symmetry journal, January 2004

Thermoinduced Magnetization in Nanoparticles of Antiferromagnetic Materials journal, May 2004

Intrinsic volume scaling of thermoinduced magnetization in antiferromagnetic nanoparticles journal, October 2005

Thermoinduced magnetization and uncompensated spins in antiferromagnetic nanoparticles journal, July 2006

Magnetism in One-Dimensional Systems—The Heisenberg Model for Infinite Spin journal, May 1964

Uniform magnetic excitations in nanoparticles journal, July 2005

Linear Magnetic Chains with Anisotropic Coupling journal, August 1964

Efficient Monte Carlo methods for the computer simulation of biological molecules journal, June 1992

Anomalous Fluctuations in Phases with a Broken Continuous Symmetry
journal, January 2004

Thermoinduced Magnetization in Nanoparticles of Antiferromagnetic Materials
journal, May 2004

Intrinsic volume scaling of thermoinduced magnetization in antiferromagnetic nanoparticles
journal, October 2005

Thermoinduced magnetization and uncompensated spins in antiferromagnetic nanoparticles
journal, July 2006

Magnetism in One-Dimensional Systems—The Heisenberg Model for Infinite Spin
journal, May 1964

Uniform magnetic excitations in nanoparticles
journal, July 2005

Linear Magnetic Chains with Anisotropic Coupling
journal, August 1964

Efficient Monte Carlo methods for the computer simulation of biological molecules
journal, June 1992