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Title: Exploiting Symmetry Mismatch to Control Magnetism in a Ferroelastic Heterostructure

Abstract

In the bulk, LaCoO 3 (LCO) is a paramagnet, yet the low-temperature ferromagnetism (FM) is observed in tensile strained thin films, and its origin remains unresolved. Here, we quantitatively measured the distribution of atomic density and magnetization in LCO films by polarized neutron reflectometry (PNR) and found that the LCO layers near the heterointerfaces exhibit a reduced magnetization but an enhanced atomic density, whereas the film's interior (i.e., its film bulk) shows the opposite trend. We attribute the nonuniformity to the symmetry mismatch at the interface, which induces a structural distortion related to the ferroelasticity of LCO. This assertion is tested by systematic application of hydrostatic pressure during the PNR experiments. The magnetization can be controlled at a rate of -20.4% per GPa. Here, these results provide unique insights into mechanisms driving FM in strained LCO films while offering a tantalizing observation that tunable deformation of the CoO 6 octahedra in combination with the ferroelastic order parameter.

Authors:
 [1];  [2];  [2];  [3];  [2];  [2];  [2];  [2];  [4];  [5];  [6];  [2];  [2];  [7]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Arizona State Univ., Tempe, AZ (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Carnegie Inst. of Science, Washington, D.C. (United States)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Martin-Luther-Univ. Halle-Wittenberg, Halle (Saale) (Germany)
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1542188
Alternate Identifier(s):
OSTI ID: 1511519; OSTI ID: 1561629
Grant/Contract Number:  
AC02-06CH11357; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 122; Journal Issue: 18; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ferroelastic materials; hydrostatic pressure; polarized neutron reflectometry; spin state transition; x-ray absorption

Citation Formats

Guo, Er-Jia, Desautels, Ryan, Lee, Dongkyu, Roldan, Manuel A., Liao, Zhaoliang, Charlton, Timothy, Ambaye, Haile, Molaison, Jamie, Boehler, Reinhard, Keavney, David, Herklotz, Andreas, Ward, T. Zac, Lee, Ho Nyung, and Fitzsimmons, Michael R. Exploiting Symmetry Mismatch to Control Magnetism in a Ferroelastic Heterostructure. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.122.187202.
Guo, Er-Jia, Desautels, Ryan, Lee, Dongkyu, Roldan, Manuel A., Liao, Zhaoliang, Charlton, Timothy, Ambaye, Haile, Molaison, Jamie, Boehler, Reinhard, Keavney, David, Herklotz, Andreas, Ward, T. Zac, Lee, Ho Nyung, & Fitzsimmons, Michael R. Exploiting Symmetry Mismatch to Control Magnetism in a Ferroelastic Heterostructure. United States. doi:10.1103/PhysRevLett.122.187202.
Guo, Er-Jia, Desautels, Ryan, Lee, Dongkyu, Roldan, Manuel A., Liao, Zhaoliang, Charlton, Timothy, Ambaye, Haile, Molaison, Jamie, Boehler, Reinhard, Keavney, David, Herklotz, Andreas, Ward, T. Zac, Lee, Ho Nyung, and Fitzsimmons, Michael R. Wed . "Exploiting Symmetry Mismatch to Control Magnetism in a Ferroelastic Heterostructure". United States. doi:10.1103/PhysRevLett.122.187202.
@article{osti_1542188,
title = {Exploiting Symmetry Mismatch to Control Magnetism in a Ferroelastic Heterostructure},
author = {Guo, Er-Jia and Desautels, Ryan and Lee, Dongkyu and Roldan, Manuel A. and Liao, Zhaoliang and Charlton, Timothy and Ambaye, Haile and Molaison, Jamie and Boehler, Reinhard and Keavney, David and Herklotz, Andreas and Ward, T. Zac and Lee, Ho Nyung and Fitzsimmons, Michael R.},
abstractNote = {In the bulk, LaCoO3 (LCO) is a paramagnet, yet the low-temperature ferromagnetism (FM) is observed in tensile strained thin films, and its origin remains unresolved. Here, we quantitatively measured the distribution of atomic density and magnetization in LCO films by polarized neutron reflectometry (PNR) and found that the LCO layers near the heterointerfaces exhibit a reduced magnetization but an enhanced atomic density, whereas the film's interior (i.e., its film bulk) shows the opposite trend. We attribute the nonuniformity to the symmetry mismatch at the interface, which induces a structural distortion related to the ferroelasticity of LCO. This assertion is tested by systematic application of hydrostatic pressure during the PNR experiments. The magnetization can be controlled at a rate of -20.4% per GPa. Here, these results provide unique insights into mechanisms driving FM in strained LCO films while offering a tantalizing observation that tunable deformation of the CoO6 octahedra in combination with the ferroelastic order parameter.},
doi = {10.1103/PhysRevLett.122.187202},
journal = {Physical Review Letters},
number = 18,
volume = 122,
place = {United States},
year = {2019},
month = {5}
}

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