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

McGuire, Michael A.; Cao, Huibo; Chakoumakos, Bryan C.; Sales, Brian C.

doi:10.1103/PhysRevB.90.174425

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

Journal Article · Tue Nov 18 00:00:00 EST 2014 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.90.174425· OSTI ID:1185615

McGuire, Michael A. ^[1]; Cao, Huibo ^[2]; Chakoumakos, Bryan C. ^[2]; Sales, Brian C. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division

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 T_SR = 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 T_SR 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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1185615

Alternate ID(s):: OSTI ID: 1180422

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 90, Issue 17; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 45 works

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Cited By (3)

Discovery of ferromagnetism with large magnetic anisotropy in ZrMnP and HfMnP Lamichhane, Tej N.; Taufour, Valentin; Masters, Morgan W. Applied Physics Letters, Vol. 109, Issue 9 https://doi.org/10.1063/1.4961933	journal	August 2016
Giant magnetostriction effect near onset of spin reorientation in MnBi Choi, Y.; Ryan, P. J.; McGuire, M. A. Applied Physics Letters, Vol. 112, Issue 19 https://doi.org/10.1063/1.5026408	journal	May 2018
Discovery of ferromagnetism with large magnetic anisotropy in ZrMnP and HfMnP Lamichhane, Tej N.; Taufour, Valentin; Masters, Morgan W. arXiv https://doi.org/10.48550/arxiv.1612.03166	text	January 2016

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