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Title: Tuning interfacial ferromagnetism in LaNiO 3 / CaMnO 3 superlattices by stabilizing nonequilibrium crystal symmetry

Abstract

Perovskite oxide heterostructures offer an important path forward for stabilizing and controlling low-dimensional magnetism. One of the guiding design principles for these materials systems is octahedral connectivity. In superlattices composed of perovskites with different crystal symmetries, variation of the relative ratio of the constituent layers and the individual layer thicknesses gives rise to nonequilibrium crystal symmetries that, in turn, lead to unprecedented control of interfacial ferromagnetism. We have found that in superlattices of CaMnO 3 (CMO) and LaNiO 3 (LNO), interfacial ferromagnetism can be modulated by a factor of 3 depending on LNO and CMO layer thicknesses as well as their relative ratio. Such an effect is only possible due to the nonequilibrium crystal symmetries at the interfaces and can be understood in terms of the anisotropy of the exchange interactions and modifications in the interfacial Ni-O-Mn and Mn-O-Mn bond angles and lengths with increasing LNO layer thickness. Here, these results demonstrate the potential of engineering nonequilibrium crystal symmetries in designing ferromagnetism.

Authors:
 [1];  [1];  [2];  [3];  [3];  [1]
  1. Stanford Univ., Stanford, CA (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1406491
Alternate Identifier(s):
OSTI ID: 1406147
Grant/Contract Number:
SC0008505; AC02-05CH11231; AC02-76SF00515; AC02-06CH11357; DESC0008505
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 14; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Flint, C. L., Vailionis, A., Zhou, H., Jang, H., Lee, J. -S., and Suzuki, Y. Tuning interfacial ferromagnetism in LaNiO3/CaMnO3 superlattices by stabilizing nonequilibrium crystal symmetry. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.144438.
Flint, C. L., Vailionis, A., Zhou, H., Jang, H., Lee, J. -S., & Suzuki, Y. Tuning interfacial ferromagnetism in LaNiO3/CaMnO3 superlattices by stabilizing nonequilibrium crystal symmetry. United States. doi:10.1103/PhysRevB.96.144438.
Flint, C. L., Vailionis, A., Zhou, H., Jang, H., Lee, J. -S., and Suzuki, Y. Tue . "Tuning interfacial ferromagnetism in LaNiO3/CaMnO3 superlattices by stabilizing nonequilibrium crystal symmetry". United States. doi:10.1103/PhysRevB.96.144438.
@article{osti_1406491,
title = {Tuning interfacial ferromagnetism in LaNiO3/CaMnO3 superlattices by stabilizing nonequilibrium crystal symmetry},
author = {Flint, C. L. and Vailionis, A. and Zhou, H. and Jang, H. and Lee, J. -S. and Suzuki, Y.},
abstractNote = {Perovskite oxide heterostructures offer an important path forward for stabilizing and controlling low-dimensional magnetism. One of the guiding design principles for these materials systems is octahedral connectivity. In superlattices composed of perovskites with different crystal symmetries, variation of the relative ratio of the constituent layers and the individual layer thicknesses gives rise to nonequilibrium crystal symmetries that, in turn, lead to unprecedented control of interfacial ferromagnetism. We have found that in superlattices of CaMnO3 (CMO) and LaNiO3 (LNO), interfacial ferromagnetism can be modulated by a factor of 3 depending on LNO and CMO layer thicknesses as well as their relative ratio. Such an effect is only possible due to the nonequilibrium crystal symmetries at the interfaces and can be understood in terms of the anisotropy of the exchange interactions and modifications in the interfacial Ni-O-Mn and Mn-O-Mn bond angles and lengths with increasing LNO layer thickness. Here, these results demonstrate the potential of engineering nonequilibrium crystal symmetries in designing ferromagnetism.},
doi = {10.1103/PhysRevB.96.144438},
journal = {Physical Review B},
number = 14,
volume = 96,
place = {United States},
year = {Tue Oct 31 00:00:00 EDT 2017},
month = {Tue Oct 31 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
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