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Title: Nanoengineering room temperature ferroelectricity into orthorhombic SmMnO3 films

Abstract

Orthorhombic RMnO3 (R = rare-earth cation) compounds are type-II multiferroics induced by inversion-symmetry-breaking of spin order. They hold promise for magneto-electric devices. However, no spontaneous room-temperature ferroic property has been observed to date in orthorhombic RMnO3. Here, using 3D straining in nanocomposite films of (SmMnO3)0.5((Bi,Sm)2O3)0.5, we demonstrate room temperature ferroelectricity and ferromagnetism with TC,FM ~ 90 K, matching exactly with theoretical predictions for the induced strain levels. Large in-plane compressive and out-of-plane tensile strains (-3.6% and +4.9%, respectively) were induced by the stiff (Bi,Sm)2O3 nanopillars embedded. The room temperature electric polarization is comparable to other spin-driven ferroelectric RMnO3 films. Also, while bulk SmMnO3 is antiferromagnetic, ferromagnetism was induced in the composite films. The Mn-O bond angles and lengths determined from density functional theory explain the origin of the ferroelectricity, i.e. modification of the exchange coupling. Our structural tuning method gives a route to designing multiferroics.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [4];  [5];  [6];  [6]; ORCiD logo [3];  [3];  [6]; ORCiD logo [5];  [3]
+ Show Author Affiliations
  1. Univ. of Cambridge (United Kingdom); Sungkyunkwan Univ. (SKKU), Suwon (South Korea). Center for Integrated Nanostructure Physics (CINAP), Inst. for Basic Science (IBS)
  2. Univ. of Cambridge (United Kingdom); Sungkyunkwan Univ. (SKKU), Suwon (South Korea). Center for Integrated Nanostructure Physics (CINAP), Inst. for Basic Science (IBS); Indian Inst. of Science Education and Research, Kerala (India)
  3. Univ. of Cambridge (United Kingdom)
  4. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  5. Purdue Univ., West Lafayette, IN (United States)
  6. Pennsylvania State Univ., University Park, PA (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); Engineering and Physical Sciences Research Council (EPSRC)
OSTI Identifier:
1668354
Report Number(s):
SAND-2020-4894J
Journal ID: ISSN 2041-1723; 685972; TRN: US2203690
Grant/Contract Number:  
AC04-94AL85000; EP/L011700/1; EP/N004272/; SC0020145; NA0003525
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 11; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Condensed-matter physics; ferroelectrics and multiferroics; materials science

Citation Formats

Choi, Eun-Mi, Maity, Tuhin, Kursumovic, Ahmed, Lu, Ping, Bi, Zenxhing, Yu, Shukai, Park, Yoonsang, Zhu, Bonan, Wu, Rui, Gopalan, Venkatraman, Wang, Haiyan, and MacManus-Driscoll, Judith L. Nanoengineering room temperature ferroelectricity into orthorhombic SmMnO3 films. United States: N. p., 2020. Web. doi:10.1038/s41467-020-16101-2.
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Choi, Eun-Mi, Maity, Tuhin, Kursumovic, Ahmed, Lu, Ping, Bi, Zenxhing, Yu, Shukai, Park, Yoonsang, Zhu, Bonan, Wu, Rui, Gopalan, Venkatraman, Wang, Haiyan, & MacManus-Driscoll, Judith L. Nanoengineering room temperature ferroelectricity into orthorhombic SmMnO3 films. United States. https://doi.org/10.1038/s41467-020-16101-2
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Choi, Eun-Mi, Maity, Tuhin, Kursumovic, Ahmed, Lu, Ping, Bi, Zenxhing, Yu, Shukai, Park, Yoonsang, Zhu, Bonan, Wu, Rui, Gopalan, Venkatraman, Wang, Haiyan, and MacManus-Driscoll, Judith L. Tue . "Nanoengineering room temperature ferroelectricity into orthorhombic SmMnO3 films". United States. https://doi.org/10.1038/s41467-020-16101-2. https://www.osti.gov/servlets/purl/1668354.
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@article{osti_1668354,
title = {Nanoengineering room temperature ferroelectricity into orthorhombic SmMnO3 films},
author = {Choi, Eun-Mi and Maity, Tuhin and Kursumovic, Ahmed and Lu, Ping and Bi, Zenxhing and Yu, Shukai and Park, Yoonsang and Zhu, Bonan and Wu, Rui and Gopalan, Venkatraman and Wang, Haiyan and MacManus-Driscoll, Judith L.},
abstractNote = {Orthorhombic RMnO3 (R = rare-earth cation) compounds are type-II multiferroics induced by inversion-symmetry-breaking of spin order. They hold promise for magneto-electric devices. However, no spontaneous room-temperature ferroic property has been observed to date in orthorhombic RMnO3. Here, using 3D straining in nanocomposite films of (SmMnO3)0.5((Bi,Sm)2O3)0.5, we demonstrate room temperature ferroelectricity and ferromagnetism with TC,FM ~ 90 K, matching exactly with theoretical predictions for the induced strain levels. Large in-plane compressive and out-of-plane tensile strains (-3.6% and +4.9%, respectively) were induced by the stiff (Bi,Sm)2O3 nanopillars embedded. The room temperature electric polarization is comparable to other spin-driven ferroelectric RMnO3 films. Also, while bulk SmMnO3 is antiferromagnetic, ferromagnetism was induced in the composite films. The Mn-O bond angles and lengths determined from density functional theory explain the origin of the ferroelectricity, i.e. modification of the exchange coupling. Our structural tuning method gives a route to designing multiferroics.},
doi = {10.1038/s41467-020-16101-2},
journal = {Nature Communications},
number = 1,
volume = 11,
place = {United States},
year = {Tue May 05 00:00:00 EDT 2020},
month = {Tue May 05 00:00:00 EDT 2020}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1038/s41467-020-16101-2
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Figures / Tables:

Fig. 1 Fig. 1: Electron microscopy images of thick SMO:BSO VAN film grown on STO (001). a Cross-sectional STEM-HAADF image showing clear pillars of BSO embedded in SMO. The BSO grows faster than SMO as observed by the pillars being thicker than the SMO. b BSO and SMO showing domain matching epitaxymore » of 7 unit cells of SMO matching with 5 unit cells of BSO. d Plan-view STEM-HAADF image shows a VAN structure over a wide area. A regular pattern of connected BSO pillars in an SMO matrix is observed. e A region of SMO enclosed by laterally connected BSO pillars is shown. c, f EDS maps and line profiles of across the VAN film, showing that SMO contains only very minor Bi and that BSO has a -1:1 Bi:Sm ratio. Scale bar: 10 nm.« less
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