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Title: Giant Spontaneous Magnetostriction in MnTe Driven by a Novel Magnetostructural Coupling Mechanism

Abstract

Abstract A comprehensive x‐ray scattering study of spontaneous magnetostriction in hexagonal MnTe, an antiferromagnetic semiconductor with a Néel temperature of T N = 307 K, is presented. The largest spontaneous magnetovolume effect known for an antiferromagnet is observed, reaching a volume contraction of |Δ V / V | > 7 × 10 −3 . This can be justified semiquantitatively by considering bulk material properties, the spatial dependence of the superexchange interaction, and the geometrical arrangement of magnetic moments in MnTe. The highly unusual linear scaling of the magnetovolume effect with the short‐range magnetic correlations, beginning in the paramagnetic state well above T N , points to a novel physical mechanism, which is explained in terms of a trilinear coupling of the elastic strain with superposed distinct domains of the antiferromagnetic order parameter. This novel mechanism for coupling lattice strain to robust short‐range magnetic order casts new light on magnetostrictive phenomena and also provides a template by which the exceptional magnetostrictive properties of MnTe might be realized in a wide range of other functional materials.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [1]
  1. Brigham Young University, Provo, UT (United States)
  2. Brookhaven National Laboratory (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE
OSTI Identifier:
2007532
Alternate Identifier(s):
OSTI ID: 1995313
Report Number(s):
BNL-224874-2023-JAAM
Journal ID: ISSN 1616-301X
Grant/Contract Number:  
SC0012704; SC0021134
Resource Type:
Accepted Manuscript
Journal Name:
Advanced Functional Materials
Additional Journal Information:
Journal Volume: 33; Journal Issue: 46; Journal ID: ISSN 1616-301X
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; magnetostructural coupling; magnetovolume effect; short-range magnetic order; spontaneous magnetostriction

Citation Formats

Baral, Raju, Abeykoon, A. M. Milinda, Campbell, Branton J., and Frandsen, Benjamin A. Giant Spontaneous Magnetostriction in MnTe Driven by a Novel Magnetostructural Coupling Mechanism. United States: N. p., 2023. Web. doi:10.1002/adfm.202305247.
Baral, Raju, Abeykoon, A. M. Milinda, Campbell, Branton J., & Frandsen, Benjamin A. Giant Spontaneous Magnetostriction in MnTe Driven by a Novel Magnetostructural Coupling Mechanism. United States. https://doi.org/10.1002/adfm.202305247
Baral, Raju, Abeykoon, A. M. Milinda, Campbell, Branton J., and Frandsen, Benjamin A. Fri . "Giant Spontaneous Magnetostriction in MnTe Driven by a Novel Magnetostructural Coupling Mechanism". United States. https://doi.org/10.1002/adfm.202305247.
@article{osti_2007532,
title = {Giant Spontaneous Magnetostriction in MnTe Driven by a Novel Magnetostructural Coupling Mechanism},
author = {Baral, Raju and Abeykoon, A. M. Milinda and Campbell, Branton J. and Frandsen, Benjamin A.},
abstractNote = {Abstract A comprehensive x‐ray scattering study of spontaneous magnetostriction in hexagonal MnTe, an antiferromagnetic semiconductor with a Néel temperature of T N = 307 K, is presented. The largest spontaneous magnetovolume effect known for an antiferromagnet is observed, reaching a volume contraction of |Δ V / V | > 7 × 10 −3 . This can be justified semiquantitatively by considering bulk material properties, the spatial dependence of the superexchange interaction, and the geometrical arrangement of magnetic moments in MnTe. The highly unusual linear scaling of the magnetovolume effect with the short‐range magnetic correlations, beginning in the paramagnetic state well above T N , points to a novel physical mechanism, which is explained in terms of a trilinear coupling of the elastic strain with superposed distinct domains of the antiferromagnetic order parameter. This novel mechanism for coupling lattice strain to robust short‐range magnetic order casts new light on magnetostrictive phenomena and also provides a template by which the exceptional magnetostrictive properties of MnTe might be realized in a wide range of other functional materials.},
doi = {10.1002/adfm.202305247},
journal = {Advanced Functional Materials},
number = 46,
volume = 33,
place = {United States},
year = {Fri Aug 04 00:00:00 EDT 2023},
month = {Fri Aug 04 00:00:00 EDT 2023}
}

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