Spin-fluctuation mechanism of anomalous temperature dependence of magnetocrystalline anisotropy in itinerant magnets

Zhuravlev, I. A.; Antropov, V. P.; Belashchenko, K. D.

doi:10.1103/PhysRevLett.115.217201

Title: Spin-fluctuation mechanism of anomalous temperature dependence of magnetocrystalline anisotropy in itinerant magnets

Abstract

The origins of the anomalous temperature dependence of magnetocrystalline anisotropy in (Fe_1–xCo_x)₂B alloys are elucidated using first-principles calculations within the disordered local moment model. Excellent agreement with experimental data is obtained. The anomalies are associated with the changes in band occupations due to Stoner-like band shifts and with the selective suppression of spin-orbit “hot spots” by thermal spin fluctuations. Under certain conditions, the anisotropy can increase, rather than decrease, with decreasing magnetization. These peculiar electronic mechanisms are in stark contrast to the assumptions of the existing models.

Authors:

Zhuravlev, I. A. ^[1]; Antropov, V. P. ^[2]; Belashchenko, K. D. ^[1]

Univ. of Nebraska-Lincoln, Lincoln, NE (United States)
Ames Lab., Ames, IA (United States)

Publication Date:: Mon Nov 16 00:00:00 EST 2015

Research Org.:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1227443

Alternate Identifier(s):: OSTI ID: 1226094

Report Number(s):: IS-J-8818
Journal ID: ISSN 0031-9007; PRLTAO

Grant/Contract Number:: DMR1308751; AC02-07CH11358

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review Letters

Additional Journal Information:: Journal Volume: 115; Journal Issue: 21; Journal ID: ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE

Citation Formats


                    Zhuravlev, I. A., Antropov, V. P., and Belashchenko, K. D. Spin-fluctuation mechanism of anomalous temperature dependence of magnetocrystalline anisotropy in itinerant magnets.  United States: N. p., 2015. 
Web.  doi:10.1103/PhysRevLett.115.217201.

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                    Zhuravlev, I. A., Antropov, V. P., & Belashchenko, K. D. Spin-fluctuation mechanism of anomalous temperature dependence of magnetocrystalline anisotropy in itinerant magnets.  United States.  https://doi.org/10.1103/PhysRevLett.115.217201

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                    Zhuravlev, I. A., Antropov, V. P., and Belashchenko, K. D. Mon .  
"Spin-fluctuation mechanism of anomalous temperature dependence of magnetocrystalline anisotropy in itinerant magnets".  United States.  https://doi.org/10.1103/PhysRevLett.115.217201.  https://www.osti.gov/servlets/purl/1227443.

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@article{osti_1227443,

  title        = {Spin-fluctuation mechanism of anomalous temperature dependence of magnetocrystalline anisotropy in itinerant magnets},

  author       = {Zhuravlev, I. A. and Antropov, V. P. and Belashchenko, K. D.},

  abstractNote = {The origins of the anomalous temperature dependence of magnetocrystalline anisotropy in (Fe1–xCox)2B alloys are elucidated using first-principles calculations within the disordered local moment model. Excellent agreement with experimental data is obtained. The anomalies are associated with the changes in band occupations due to Stoner-like band shifts and with the selective suppression of spin-orbit “hot spots” by thermal spin fluctuations. Under certain conditions, the anisotropy can increase, rather than decrease, with decreasing magnetization. These peculiar electronic mechanisms are in stark contrast to the assumptions of the existing models.},

  doi          = {10.1103/PhysRevLett.115.217201},

  journal      = {Physical Review Letters},

  number       = 21,

  volume       = 115,

  place        = {United States},

  year         = {Mon Nov 16 00:00:00 EST 2015},

  month        = {Mon Nov 16 00:00:00 EST 2015}

}

Copy to clipboard

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Works referenced in this record:

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Giant magnetostriction effect near onset of spin reorientation in MnBi
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Title: Spin-fluctuation mechanism of anomalous temperature dependence of magnetocrystalline anisotropy in itinerant magnets

Abstract

Citation Formats

Perspectives on Permanent Magnetic Materials for Energy Conversion and Power Generation journal, July 2012

Heat Assisted Magnetic Recording journal, November 2008

The present status of the temperature dependence of magnetocrystalline anisotropy, and the power law journal, August 1966

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Chemical-order-dependent magnetic anisotropy and exchange stiffness constant of FePt (001) epitaxial films journal, July 2002

Temperature-dependent magnetic properties of FePt: Effective spin Hamiltonian model journal, March 2005

Magnetocrystalline Anisotropy in (Fe 1- x Co x ) 2 B System journal, April 1970

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Magnetic anisotropic effects and electronic correlations in MnBi ferromagnet
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Theory of the temperature dependence of the easy axis of magnetization in hcp Gd
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$R_{2}$ ${Fe}_{14}$ B materials: Intrinsic properties and technological aspects
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Linear methods in band theory
journal, October 1975

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