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Title: Interface-induced multiferroism by design in complex oxide superlattices

Abstract

Interfaces between materials present unique opportunities for the discovery of intriguing quantum phenomena. Here we explore the possibility that, in the case of superlattices, if one of the layers is made ultrathin, unexpected properties can be induced between the two bracketing interfaces. We pursue this objective by combining advanced growth and characterization techniques with theoretical calculations. Using prototype La2/3Sr1/3MnO3/BaTiO3 (LSMO/BTO) superlattices, we observe a structural evolution in the LSMO layers as a function of thickness. Atomic-resolution electron microscopy and spectroscopy reveal an unusual polar structure phase in ultrathin LSMO at a critical thickness due to interfacing with the adjacent BTO layers, which is confirmed by first-principles calculations. Most important is the fact that this polar phase is accompanied by re-emergent ferromagnetism, making this system a potential candidate for ultrathin ferroelectrics with ferromagnetic ordering. Monte-Carlo simulations illustrate the important role of spin-lattice coupling in LSMO. The present results open up a conceptually intriguing recipe for developing novel functional ultrathin materials via interface-induced spin-lattice coupling.

Authors:
 [1];  [2];  [3];  [4];  [1];  [1];  [3];  [5];  [5];  [1];  [4];  [6];  [1];  [1]
  1. Louisiana State Univ., Baton Rouge, LA (United States)
  2. Louisiana State Univ., Baton Rouge, LA (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Southeast Univ., Nanjing (China)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Vanderbilt Univ., Nashville, TN (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Brookhaven National Lab. (BNL), Upton, NY (United States); Vanderbilt Univ., Nashville, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1389234
Alternate Identifier(s):
OSTI ID: 1376517; OSTI ID: 1597823
Report Number(s):
BNL-114200-2017-JA
Journal ID: ISSN 0027-8424; R&D Project: MA015MACA; KC0201010
Grant/Contract Number:  
SC0012704; AC05-00OR22725; FG02-09ER46554
Resource Type:
Accepted Manuscript
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 114; Journal Issue: 26; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Spin-lattice coupling; interfaces; structural transition; 36 MATERIALS SCIENCE

Citation Formats

Guo, Hangwen, Wang, Zhen, Dong, Shuai, Ghosh, Saurabh, Saghayezhian, Mohammad, Chen, Lina, Weng, Yakui, Herklotz, Andreas, Ward, Thomas Z., Jin, Rongying, Pantelides, Sokrates T., Zhu, Yimei, Zhang, Jiandi, and Plummer, E. W. Interface-induced multiferroism by design in complex oxide superlattices. United States: N. p., 2017. Web. doi:10.1073/pnas.1706814114.
Guo, Hangwen, Wang, Zhen, Dong, Shuai, Ghosh, Saurabh, Saghayezhian, Mohammad, Chen, Lina, Weng, Yakui, Herklotz, Andreas, Ward, Thomas Z., Jin, Rongying, Pantelides, Sokrates T., Zhu, Yimei, Zhang, Jiandi, & Plummer, E. W. Interface-induced multiferroism by design in complex oxide superlattices. United States. doi:10.1073/pnas.1706814114.
Guo, Hangwen, Wang, Zhen, Dong, Shuai, Ghosh, Saurabh, Saghayezhian, Mohammad, Chen, Lina, Weng, Yakui, Herklotz, Andreas, Ward, Thomas Z., Jin, Rongying, Pantelides, Sokrates T., Zhu, Yimei, Zhang, Jiandi, and Plummer, E. W. Mon . "Interface-induced multiferroism by design in complex oxide superlattices". United States. doi:10.1073/pnas.1706814114. https://www.osti.gov/servlets/purl/1389234.
@article{osti_1389234,
title = {Interface-induced multiferroism by design in complex oxide superlattices},
author = {Guo, Hangwen and Wang, Zhen and Dong, Shuai and Ghosh, Saurabh and Saghayezhian, Mohammad and Chen, Lina and Weng, Yakui and Herklotz, Andreas and Ward, Thomas Z. and Jin, Rongying and Pantelides, Sokrates T. and Zhu, Yimei and Zhang, Jiandi and Plummer, E. W.},
abstractNote = {Interfaces between materials present unique opportunities for the discovery of intriguing quantum phenomena. Here we explore the possibility that, in the case of superlattices, if one of the layers is made ultrathin, unexpected properties can be induced between the two bracketing interfaces. We pursue this objective by combining advanced growth and characterization techniques with theoretical calculations. Using prototype La2/3Sr1/3MnO3/BaTiO3 (LSMO/BTO) superlattices, we observe a structural evolution in the LSMO layers as a function of thickness. Atomic-resolution electron microscopy and spectroscopy reveal an unusual polar structure phase in ultrathin LSMO at a critical thickness due to interfacing with the adjacent BTO layers, which is confirmed by first-principles calculations. Most important is the fact that this polar phase is accompanied by re-emergent ferromagnetism, making this system a potential candidate for ultrathin ferroelectrics with ferromagnetic ordering. Monte-Carlo simulations illustrate the important role of spin-lattice coupling in LSMO. The present results open up a conceptually intriguing recipe for developing novel functional ultrathin materials via interface-induced spin-lattice coupling.},
doi = {10.1073/pnas.1706814114},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 26,
volume = 114,
place = {United States},
year = {2017},
month = {6}
}

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