Element-resolved magnetism across the temperature- and pressure-induced spin reorientation in MnBi

Yongseong Choi, Xiujuan Jiang, Wenli Bi, Pavel Lapa, Rajiv K. Chouhan, D. Paudyal, Tamas Varga, Dmitry Popov, Jun Cui, Daniel Haskel, and J. S. Jiang
Phys. Rev. B 94, 184433 – Published 28 November 2016

Abstract

Rare-earth free permanent magnet MnBi (NiAs-type crystal structure) displays strong uniaxial magnetic anisotropy above its 90 K spin reorientation transition (SRT). X-ray magnetic circular dichroism (XMCD) measurements at the Mn K and Bi L2,3 edges show induced magnetism in Bi, which is strongly coupled to the magnetism of Mn. Temperature- and pressure-dependent XMCD results reveal that hydrostatic pressure mimics the effect of temperature, driving a transition from uniaxial to in-plane anisotropy. The pressure and temperature transitions are shown to be connected to an anisotropic lattice contraction in NiAs-type structures. Temperature and pressure, hence, induce coupled structural and magnetic responses, highlighting the importance of both anisotropic lattice change and Mn-Bi hybridization in leading to the magnetic anisotropy change across the SRT. The dependence of magnetic anisotropy on the anisotropic lattice change is confirmed by density functional theory.

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  • Received 23 February 2016
  • Revised 10 October 2016

DOI:https://doi.org/10.1103/PhysRevB.94.184433

©2016 American Physical Society

Authors & Affiliations

Yongseong Choi1, Xiujuan Jiang2, Wenli Bi1,3, Pavel Lapa4, Rajiv K. Chouhan5, D. Paudyal5, Tamas Varga6, Dmitry Popov7, Jun Cui2,5,8, Daniel Haskel1, and J. S. Jiang4

  • 1Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 2Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, USA
  • 3Department of Geology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
  • 4Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 5Ames Laboratory, US Department of Energy, Ames, Iowa 50011, USA
  • 6Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354, USA
  • 7High Pressure Collaborative Access Team, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, USA
  • 8Materials Science and Engineering Department, Iowa State University, Ames, Iowa 50011, USA

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Issue

Vol. 94, Iss. 18 — 1 November 2016

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