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Title: Influence of chemical composition and crystallographic orientation on the interfacial magnetism in BiFe O 3 / L a 1 - x S r x Mn O 3 superlattices

Abstract

The emergence of magnetism unique to the interface between the multiferroic BiFeO3 (BFO) and ferromagnetic La1-xSrxMnO3 (LSMO) offers an opportunity to control magnetism in nanoscale heterostructures with electric fields. Here, we investigate the influence of chemical composition and crystallographic orientation on the interfacial magnetism of BFO/LSMO superlattices. Our results reveal that the induced net magnetic moment in the BFO layers increases monotonically with increasing saturation magnetization of the LSMO layers. For the (100)-BFO/LSMO (x=0.2) superlattice, the induced moment reaches a record high value of ~2.8μB/Fe. No interfacial magnetization is observed at the (100)-BFO/LSMO interface when LSMO is an antiferromagnet. In contrast to (100)-oriented superlattices, no induced moment is observed in (111)-BFO layers. Our results suggest the interfacial structural reconstruction may not be a sufficient condition for the enhanced net moment in BFO layer. Instead, spin canting induced by interfacial exchange coupling is proposed in the (100)- but not in the (111)-BFO, leading to the large net magnetization at the (100)-oriented interface. Lastly, this work further demonstrates the importance of exchange coupling across heterointerfaces for spin canting in nominally antiferromagnets, providing a pathway to control the magnetic properties of artificial oxide heterostructures.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [4]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China)
  2. Arizona State Univ., Tempe, AZ (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1490596
Alternate Identifier(s):
OSTI ID: 1481936
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 2; Journal Issue: 11; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE

Citation Formats

Guo, Er-Jia, Roldan, Manuel A., Sang, Xiahan, Okamoto, Satoshi, Charlton, Timothy R., Ambaye, Haile Arena, Lee, Ho Nyung, and Fitzsimmons, Michael R. Influence of chemical composition and crystallographic orientation on the interfacial magnetism in BiFeO3 / La1-xSrxMnO3 superlattices. United States: N. p., 2018. Web. doi:10.1103/PhysRevMaterials.2.114404.
Guo, Er-Jia, Roldan, Manuel A., Sang, Xiahan, Okamoto, Satoshi, Charlton, Timothy R., Ambaye, Haile Arena, Lee, Ho Nyung, & Fitzsimmons, Michael R. Influence of chemical composition and crystallographic orientation on the interfacial magnetism in BiFeO3 / La1-xSrxMnO3 superlattices. United States. doi:10.1103/PhysRevMaterials.2.114404.
Guo, Er-Jia, Roldan, Manuel A., Sang, Xiahan, Okamoto, Satoshi, Charlton, Timothy R., Ambaye, Haile Arena, Lee, Ho Nyung, and Fitzsimmons, Michael R. Tue . "Influence of chemical composition and crystallographic orientation on the interfacial magnetism in BiFeO3 / La1-xSrxMnO3 superlattices". United States. doi:10.1103/PhysRevMaterials.2.114404. https://www.osti.gov/servlets/purl/1490596.
@article{osti_1490596,
title = {Influence of chemical composition and crystallographic orientation on the interfacial magnetism in BiFeO3 / La1-xSrxMnO3 superlattices},
author = {Guo, Er-Jia and Roldan, Manuel A. and Sang, Xiahan and Okamoto, Satoshi and Charlton, Timothy R. and Ambaye, Haile Arena and Lee, Ho Nyung and Fitzsimmons, Michael R.},
abstractNote = {The emergence of magnetism unique to the interface between the multiferroic BiFeO3 (BFO) and ferromagnetic La1-xSrxMnO3 (LSMO) offers an opportunity to control magnetism in nanoscale heterostructures with electric fields. Here, we investigate the influence of chemical composition and crystallographic orientation on the interfacial magnetism of BFO/LSMO superlattices. Our results reveal that the induced net magnetic moment in the BFO layers increases monotonically with increasing saturation magnetization of the LSMO layers. For the (100)-BFO/LSMO (x=0.2) superlattice, the induced moment reaches a record high value of ~2.8μB/Fe. No interfacial magnetization is observed at the (100)-BFO/LSMO interface when LSMO is an antiferromagnet. In contrast to (100)-oriented superlattices, no induced moment is observed in (111)-BFO layers. Our results suggest the interfacial structural reconstruction may not be a sufficient condition for the enhanced net moment in BFO layer. Instead, spin canting induced by interfacial exchange coupling is proposed in the (100)- but not in the (111)-BFO, leading to the large net magnetization at the (100)-oriented interface. Lastly, this work further demonstrates the importance of exchange coupling across heterointerfaces for spin canting in nominally antiferromagnets, providing a pathway to control the magnetic properties of artificial oxide heterostructures.},
doi = {10.1103/PhysRevMaterials.2.114404},
journal = {Physical Review Materials},
number = 11,
volume = 2,
place = {United States},
year = {2018},
month = {11}
}

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