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

Abstract

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 (T-SR), whereby the easy axis direction changes from the c axis to the basal plane. Across T-SR, 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 T-SR, 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. 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.

Authors:
 [1];  [1]; ORCiD logo [2]; ORCiD logo [2];  [1]
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  1. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
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)
OSTI Identifier:
1440820
Alternate Identifier(s):
OSTI ID: 1436903; OSTI ID: 1461538
Grant/Contract Number:  
AC05-00OR22725; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 112; Journal Issue: 19; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Choi, Y., Ryan, P. J., McGuire, Michael A., Sales, Brian C., and Kim, J. -W. Giant magnetostriction effect near onset of spin reorientation in MnBi. United States: N. p., 2018. Web. doi:10.1063/1.5026408.
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Choi, Y., Ryan, P. J., McGuire, Michael A., Sales, Brian C., & Kim, J. -W. Giant magnetostriction effect near onset of spin reorientation in MnBi. United States. https://doi.org/10.1063/1.5026408
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Choi, Y., Ryan, P. J., McGuire, Michael A., Sales, Brian C., and Kim, J. -W. Fri . "Giant magnetostriction effect near onset of spin reorientation in MnBi". United States. https://doi.org/10.1063/1.5026408. https://www.osti.gov/servlets/purl/1440820.
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@article{osti_1440820,
title = {Giant magnetostriction effect near onset of spin reorientation in MnBi},
author = {Choi, Y. and Ryan, P. J. and McGuire, Michael A. and Sales, Brian C. and Kim, J. -W.},
abstractNote = {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 (T-SR), whereby the easy axis direction changes from the c axis to the basal plane. Across T-SR, 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 T-SR, 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. 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.},
doi = {10.1063/1.5026408},
journal = {Applied Physics Letters},
number = 19,
volume = 112,
place = {United States},
year = {Fri May 11 00:00:00 EDT 2018},
month = {Fri May 11 00:00:00 EDT 2018}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1063/1.5026408
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Cited by: 2 works
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Figures / Tables:

FIG. 1 FIG. 1: Temperature dependence of the MnBi lattice. Diffracted intensity as a function of 2θ scattering angle and sample temperature, with increasing temperature. (a,b) (006) reflection. (c,d) (404) reflection. (e) Hexagonal crystal structure of MnBi. (f) Images of the hexagonal MnBi crystal.
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