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Title: Thickness dependence of exchange coupling in (111)-oriented perovskite oxide superlattices

Abstract

Epitaxial La 0.7Sr 0.3MnO 3 (LSMO)/La 0.7Sr 0.3FeO 3 (LSFO) superlattices on (111)-oriented SrTiO 3 substrates with sublayer thicknesses ranging from 3 to 60 unit cells (u.c.) were synthesized and characterized. Detailed analysis of their structural, electronic, and magnetic properties were performed to explore the effect of sublayer thickness on the magnetic structure and exchange coupling at (111)-oriented perovskite oxide interfaces. In the ultrathin limit (3-6 u.c.), we find that the antiferromagnetic (AF) properties of the LSFO sublayers are preserved with an out-of-plane canting of the AF spin axis, while the ferromagnetic (FM) properties of the LSMO sublayers are significantly depressed. For thicker LSFO layers (>9 u.c.), the out-of-plane canting of the AF spin axis is only present in superlattices with thick LSMO sublayers. In conclusion, exchange coupling in the form of spin-flop coupling exists only in superlattices which display both robust ferromagnetism and out-of-plane canting of the AF spin axis.

Authors:
 [1];  [1];  [2];  [3];  [3];  [4];  [4];  [1]
  1. Univ. of California, Davis, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1329130
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 10; 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

Jia, Yue, Chopdekar, Rajesh V., Arenholz, Elke, Liu, Zhiqi, Biegalski, Michael D., Porter, Zachary D., Mehta, Apurva, and Takamura, Yayoi. Thickness dependence of exchange coupling in (111)-oriented perovskite oxide superlattices. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.93.104403.
Jia, Yue, Chopdekar, Rajesh V., Arenholz, Elke, Liu, Zhiqi, Biegalski, Michael D., Porter, Zachary D., Mehta, Apurva, & Takamura, Yayoi. Thickness dependence of exchange coupling in (111)-oriented perovskite oxide superlattices. United States. https://doi.org/10.1103/PhysRevB.93.104403
Jia, Yue, Chopdekar, Rajesh V., Arenholz, Elke, Liu, Zhiqi, Biegalski, Michael D., Porter, Zachary D., Mehta, Apurva, and Takamura, Yayoi. Thu . "Thickness dependence of exchange coupling in (111)-oriented perovskite oxide superlattices". United States. https://doi.org/10.1103/PhysRevB.93.104403.
@article{osti_1329130,
title = {Thickness dependence of exchange coupling in (111)-oriented perovskite oxide superlattices},
author = {Jia, Yue and Chopdekar, Rajesh V. and Arenholz, Elke and Liu, Zhiqi and Biegalski, Michael D. and Porter, Zachary D. and Mehta, Apurva and Takamura, Yayoi},
abstractNote = {Epitaxial La0.7Sr0.3MnO3 (LSMO)/La0.7Sr0.3FeO3 (LSFO) superlattices on (111)-oriented SrTiO3 substrates with sublayer thicknesses ranging from 3 to 60 unit cells (u.c.) were synthesized and characterized. Detailed analysis of their structural, electronic, and magnetic properties were performed to explore the effect of sublayer thickness on the magnetic structure and exchange coupling at (111)-oriented perovskite oxide interfaces. In the ultrathin limit (3-6 u.c.), we find that the antiferromagnetic (AF) properties of the LSFO sublayers are preserved with an out-of-plane canting of the AF spin axis, while the ferromagnetic (FM) properties of the LSMO sublayers are significantly depressed. For thicker LSFO layers (>9 u.c.), the out-of-plane canting of the AF spin axis is only present in superlattices with thick LSMO sublayers. In conclusion, exchange coupling in the form of spin-flop coupling exists only in superlattices which display both robust ferromagnetism and out-of-plane canting of the AF spin axis.},
doi = {10.1103/PhysRevB.93.104403},
url = {https://www.osti.gov/biblio/1329130}, journal = {Physical Review B},
issn = {2469-9950},
number = 10,
volume = 93,
place = {United States},
year = {2016},
month = {3}
}

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