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Title: Symmetry-lowering lattice distortion at the spin reorientation in MnBi single crystals

Abstract

Here we report structural and physical properties determined by measurements on large single crystals of the anisotropic ferromagnet MnBi. The findings support the importance of magnetoelastic effects in this material. X-ray diffraction reveals a structural phase transition at the spin reorientation temperature TSR = 90 K. The distortion is driven by magneto-elastic coupling, and upon cooling transforms the structure from hexagonal to orthorhombic. Heat capacity measurements show a thermal anomaly at the crystallographic transition, which is suppressed rapidly by applied magnetic fields. Effects on the transport and anisotropic magnetic properties of the single crystals are also presented. Increasing anisotropy of the atomic displacement parameters for Bi with increasing temperature above TSR is revealed by neutron diffraction measurements. It is likely that this is directly related to the anisotropic thermal expansion in MnBi, which plays a key role in the spin reorientation and magnetocrystalline anisotropy. Finally, the identification of the true ground state crystal structure reported here may be important for future experimental and theoretical studies of this permanent magnet material, which have to date been performed and interpreted using only the high temperature structure.

Authors:
 [1];  [2];  [2];  [1]
+ Show Author Affiliations
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1185615
Alternate Identifier(s):
OSTI ID: 1180422
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 90; Journal Issue: 17; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

McGuire, Michael A., Cao, Huibo, Chakoumakos, Bryan C., and Sales, Brian C. Symmetry-lowering lattice distortion at the spin reorientation in MnBi single crystals. United States: N. p., 2014. Web. doi:10.1103/PhysRevB.90.174425.
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McGuire, Michael A., Cao, Huibo, Chakoumakos, Bryan C., & Sales, Brian C. Symmetry-lowering lattice distortion at the spin reorientation in MnBi single crystals. United States. https://doi.org/10.1103/PhysRevB.90.174425
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McGuire, Michael A., Cao, Huibo, Chakoumakos, Bryan C., and Sales, Brian C. Tue . "Symmetry-lowering lattice distortion at the spin reorientation in MnBi single crystals". United States. https://doi.org/10.1103/PhysRevB.90.174425. https://www.osti.gov/servlets/purl/1185615.
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@article{osti_1185615,
title = {Symmetry-lowering lattice distortion at the spin reorientation in MnBi single crystals},
author = {McGuire, Michael A. and Cao, Huibo and Chakoumakos, Bryan C. and Sales, Brian C.},
abstractNote = {Here we report structural and physical properties determined by measurements on large single crystals of the anisotropic ferromagnet MnBi. The findings support the importance of magnetoelastic effects in this material. X-ray diffraction reveals a structural phase transition at the spin reorientation temperature TSR = 90 K. The distortion is driven by magneto-elastic coupling, and upon cooling transforms the structure from hexagonal to orthorhombic. Heat capacity measurements show a thermal anomaly at the crystallographic transition, which is suppressed rapidly by applied magnetic fields. Effects on the transport and anisotropic magnetic properties of the single crystals are also presented. Increasing anisotropy of the atomic displacement parameters for Bi with increasing temperature above TSR is revealed by neutron diffraction measurements. It is likely that this is directly related to the anisotropic thermal expansion in MnBi, which plays a key role in the spin reorientation and magnetocrystalline anisotropy. Finally, the identification of the true ground state crystal structure reported here may be important for future experimental and theoretical studies of this permanent magnet material, which have to date been performed and interpreted using only the high temperature structure.},
doi = {10.1103/PhysRevB.90.174425},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 17,
volume = 90,
place = {United States},
year = {Tue Nov 18 00:00:00 EST 2014},
month = {Tue Nov 18 00:00:00 EST 2014}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1103/PhysRevB.90.174425
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Cited by: 45 works
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Figures / Tables:

Figure 1 Figure 1: X-ray diffraction patterns from MnBi single crystal faces at room temperature. (a) Diffraction from a face perpendicular to the c-axis. (b) Diffraction from a face perpendicular to the a-axis. The inset in (a) shows a photograph of typical MnBi crystals. The inset in (b) shows the room temperaturemore » hexagonal crystal structure of MnBi. The lattice constants determined from the reflections shown in the figure are listed in (b).« less
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    Works referencing / citing this record:

    Discovery of ferromagnetism with large magnetic anisotropy in ZrMnP and HfMnP
    journal, August 2016

    • Lamichhane, Tej N.; Taufour, Valentin; Masters, Morgan W.
    • Applied Physics Letters, Vol. 109, Issue 9
    • DOI: 10.1063/1.4961933

    Giant magnetostriction effect near onset of spin reorientation in MnBi
    journal, May 2018

    • Choi, Y.; Ryan, P. J.; McGuire, M. A.
    • Applied Physics Letters, Vol. 112, Issue 19
    • DOI: 10.1063/1.5026408

    Discovery of ferromagnetism with large magnetic anisotropy in ZrMnP and HfMnP
    text, January 2016

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