Giant magnetostriction effect near onset of spin reorientation in MnBi

Choi, Y.; Ryan, P. J.; McGuire, Michael A.; Sales, Brian C.; Kim, J. -W.

doi:10.1063/1.5026408

Title: Giant magnetostriction effect near onset of spin reorientation in MnBi

Journal Article · 11 May 2018 · Applied Physics Letters

DOI: https://doi.org/10.1063/1.5026408 · OSTI ID:1440820

Choi, Y. ^[1]; Ryan, P. J. ^[1];

^[2];

^[2]; Kim, J. -W. ^[1]

Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

In materials undergoing spontaneous symmetry breaking transitions, the emergence of multiple competing order parameters is pervasive. Employing in-field x-ray diffraction, we investigate the temperature and magnetic field dependence of the crystallographic structure of MnBi, elucidating the microscopic interplay between lattices and spin. The hexagonal phase of MnBi undergoes a spin reorientation transition (TSR), whereby the easy axis direction changes from the c axis to the basal plane. Across TSR, an abrupt symmetry change is accompanied by a clear sign change in the magnetostrictive coefficient, revealing that this transition corresponds to the onset of the spin reorientation. In the vicinity of TSR, a significantly larger in-plane magnetostrictive effect is observed, presenting the emergence of an intermediate phase that is highly susceptible to an applied magnetic field. X-ray linear dichroism shows that asymmetric Bi and Mn p orbitals do not play a role in the spin reorientation. Furthermore, this work suggests that the spin reorientation is caused by structural modification rather than changes in the local electronic configuration, providing a strategy for manipulating the magnetic anisotropy by external strain.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)

Grant/Contract Number:: AC05-00OR22725; AC02-06CH11357

OSTI ID:: 1440820

Alternate ID(s):: OSTI ID: 1436903; OSTI ID: 1461538

Journal Information:: Applied Physics Letters, Vol. 112, Issue 19; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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