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Title: Spatially Resolved Large Magnetization in Ultrathin BiFeO3

Abstract

Complex interactions across the interface in heterostructures can generate novel functionalities not present in the constituent materials. Here, we create a unique ferromagnetic ground state out of normally antiferromagnetic BiFeO3 (BFO) by interleaving it with layers of ferromagnetic La0.7Sr0.3MnO3. Intriguingly, we found that the magnetization of BFO was aligned opposite to that of the manganite layers. Based on polarized neutron reflectometry (PNR) depth profiling of custom-designed layers, we obtained a net magnetization in the BFO layers of 275 kA/m (~1.83 B/Fe) at 10 K, which is two times larger than the previously reported values. Additionally, ferromagnetic order in the BFO persists up to 200 K, which is much higher than previously seen in BFO heterostructures. Our unprecedented understanding of the evolution of magnetism and functional coupling across the interface between antiferromagnetic and ferromagnetic layers provides a blueprint towards advanced spintronic devices.

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [1];  [1];  [2];  [2];  [5];  [6];  [4];  [2];  [7]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  3. King Abdullah Univ. of Science and Technology (KAUST), Thuwal (Saudi Arabia). Imaging and Characterization Core Lab.
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS), Inst. for Functional Imaging of Materials
  5. Univ. of Manitoba, Winnipeg (Canada). Dept. of Physics and Astronomy
  6. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
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)
OSTI Identifier:
1366389
Alternate Identifier(s):
OSTI ID: 1376743
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Advanced Materials
Additional Journal Information:
Journal Volume: 29; Journal Issue: 32; Journal ID: ISSN 0935-9648
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Interfacial magnetism; complex oxide superlattice; multiferroic; polarized neutron reflectometry; X-ray absorption

Citation Formats

Guo, Er-Jia, Petrie, Jonathan R., Roldan, Manuel A., Li, Qian, Desautels, Ryan D., Charlton, Timothy, Herklotz, Andreas, Nichols, John, van Lierop, Johan, Freeland, John W., Kalinin, Sergei V., Lee, Ho Nyung, and Fitzsimmons, Michael R. Spatially Resolved Large Magnetization in Ultrathin BiFeO3. United States: N. p., 2017. Web. doi:10.1002/adma.201700790.
Guo, Er-Jia, Petrie, Jonathan R., Roldan, Manuel A., Li, Qian, Desautels, Ryan D., Charlton, Timothy, Herklotz, Andreas, Nichols, John, van Lierop, Johan, Freeland, John W., Kalinin, Sergei V., Lee, Ho Nyung, & Fitzsimmons, Michael R. Spatially Resolved Large Magnetization in Ultrathin BiFeO3. United States. doi:10.1002/adma.201700790.
Guo, Er-Jia, Petrie, Jonathan R., Roldan, Manuel A., Li, Qian, Desautels, Ryan D., Charlton, Timothy, Herklotz, Andreas, Nichols, John, van Lierop, Johan, Freeland, John W., Kalinin, Sergei V., Lee, Ho Nyung, and Fitzsimmons, Michael R. Mon . "Spatially Resolved Large Magnetization in Ultrathin BiFeO3". United States. doi:10.1002/adma.201700790. https://www.osti.gov/servlets/purl/1366389.
@article{osti_1366389,
title = {Spatially Resolved Large Magnetization in Ultrathin BiFeO3},
author = {Guo, Er-Jia and Petrie, Jonathan R. and Roldan, Manuel A. and Li, Qian and Desautels, Ryan D. and Charlton, Timothy and Herklotz, Andreas and Nichols, John and van Lierop, Johan and Freeland, John W. and Kalinin, Sergei V. and Lee, Ho Nyung and Fitzsimmons, Michael R.},
abstractNote = {Complex interactions across the interface in heterostructures can generate novel functionalities not present in the constituent materials. Here, we create a unique ferromagnetic ground state out of normally antiferromagnetic BiFeO3 (BFO) by interleaving it with layers of ferromagnetic La0.7Sr0.3MnO3. Intriguingly, we found that the magnetization of BFO was aligned opposite to that of the manganite layers. Based on polarized neutron reflectometry (PNR) depth profiling of custom-designed layers, we obtained a net magnetization in the BFO layers of 275 kA/m (~1.83 B/Fe) at 10 K, which is two times larger than the previously reported values. Additionally, ferromagnetic order in the BFO persists up to 200 K, which is much higher than previously seen in BFO heterostructures. Our unprecedented understanding of the evolution of magnetism and functional coupling across the interface between antiferromagnetic and ferromagnetic layers provides a blueprint towards advanced spintronic devices.},
doi = {10.1002/adma.201700790},
journal = {Advanced Materials},
number = 32,
volume = 29,
place = {United States},
year = {2017},
month = {6}
}

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