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Title: Enhanced interfacial ferromagnetism and exchange bias in (111)-oriented LaNiO 3 / CaMnO 3 superlattices

Abstract

© 2019 American Physical Society. Emergent properties of complex oxide interfaces are based on interface reconstruction that is driven by mismatch of electronic bands, valence states, interaction lengths, and even crystal symmetry of the interface. In particular, emergent ferromagnetism at the interface of two materials that do not exhibit ferro- or ferrimagnetism in the bulk has been stabilized as a result of competing exchange interactions. When LaNiO3 and CaMnO3, which are a paramagnetic metal and antiferromagnetic insulator in the bulk, respectively, are brought together, ferromagnetism emerges at the interface. Here we show that in (111)-oriented LaNiO3/CaMnO3 (LNO/CMO) superlattices, Ni2+-Mn4+ superexchange interactions due to polar mismatch at the LNO/CMO interfaces are responsible for the emergent ferromagnetism. Compared to (001)-oriented LNO/CMO superlattices, (111)-oriented LNO/CMO superlattices exhibit enhanced interfacial ferromagnetism with a TC>200 K, greater than the bulk antiferromagnetic transition temperature of CaMnO3 and a saturated magnetic moment enhanced by up to a factor of 3. Furthermore, we observe exchange bias in (111)-oriented superlattices. The strong exchange interactions along the (111) interface, manifest in the enhanced Tc and exchange bias, make this class of CMO-based materials with (111)-oriented interfaces good candidates for low-dimensional spin-polarized materials in spintronic applications.

Authors:
 [1];  [1];  [2];  [3];  [3];  [3];  [1]
  1. Stanford Univ., CA (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1532381
Alternate Identifier(s):
OSTI ID: 1524116; OSTI ID: 1559868; OSTI ID: 1634046; OSTI ID: 1635665
Grant/Contract Number:  
SC0008505; AC02-76SF00515; AC02-05CH11231; AC02-06CH11357; ECCS-1542152
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 3; Journal Issue: 6; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; emergent magnetism; complex oxides; ferromagnetism; magnetic interactions; interfaces; magnetic multilayers; transition-metal oxides; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Flint, C. L., Yi, D., Karapetrova, E., N'Diaye, A. T., Shafer, P., Arenholz, E., and Suzuki, Y. Enhanced interfacial ferromagnetism and exchange bias in (111)-oriented LaNiO3/CaMnO3 superlattices. United States: N. p., 2019. Web. doi:10.1103/physrevmaterials.3.064401.
Flint, C. L., Yi, D., Karapetrova, E., N'Diaye, A. T., Shafer, P., Arenholz, E., & Suzuki, Y. Enhanced interfacial ferromagnetism and exchange bias in (111)-oriented LaNiO3/CaMnO3 superlattices. United States. doi:10.1103/physrevmaterials.3.064401.
Flint, C. L., Yi, D., Karapetrova, E., N'Diaye, A. T., Shafer, P., Arenholz, E., and Suzuki, Y. Mon . "Enhanced interfacial ferromagnetism and exchange bias in (111)-oriented LaNiO3/CaMnO3 superlattices". United States. doi:10.1103/physrevmaterials.3.064401. https://www.osti.gov/servlets/purl/1532381.
@article{osti_1532381,
title = {Enhanced interfacial ferromagnetism and exchange bias in (111)-oriented LaNiO3/CaMnO3 superlattices},
author = {Flint, C. L. and Yi, D. and Karapetrova, E. and N'Diaye, A. T. and Shafer, P. and Arenholz, E. and Suzuki, Y.},
abstractNote = {© 2019 American Physical Society. Emergent properties of complex oxide interfaces are based on interface reconstruction that is driven by mismatch of electronic bands, valence states, interaction lengths, and even crystal symmetry of the interface. In particular, emergent ferromagnetism at the interface of two materials that do not exhibit ferro- or ferrimagnetism in the bulk has been stabilized as a result of competing exchange interactions. When LaNiO3 and CaMnO3, which are a paramagnetic metal and antiferromagnetic insulator in the bulk, respectively, are brought together, ferromagnetism emerges at the interface. Here we show that in (111)-oriented LaNiO3/CaMnO3 (LNO/CMO) superlattices, Ni2+-Mn4+ superexchange interactions due to polar mismatch at the LNO/CMO interfaces are responsible for the emergent ferromagnetism. Compared to (001)-oriented LNO/CMO superlattices, (111)-oriented LNO/CMO superlattices exhibit enhanced interfacial ferromagnetism with a TC>200 K, greater than the bulk antiferromagnetic transition temperature of CaMnO3 and a saturated magnetic moment enhanced by up to a factor of 3. Furthermore, we observe exchange bias in (111)-oriented superlattices. The strong exchange interactions along the (111) interface, manifest in the enhanced Tc and exchange bias, make this class of CMO-based materials with (111)-oriented interfaces good candidates for low-dimensional spin-polarized materials in spintronic applications.},
doi = {10.1103/physrevmaterials.3.064401},
journal = {Physical Review Materials},
number = 6,
volume = 3,
place = {United States},
year = {2019},
month = {6}
}

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