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Title: Tuning interfacial exchange interactions via electronic reconstruction in transition-metal oxide heterostructures

Abstract

The impact of interfacial electronic reconstruction on the magnetic characteristics of La0.7Sr0.3CoO3 (LSCO)/La0.7Sr0.3MnO3 (LSMO) superlattices was investigated as a function of layer thickness using a combination of soft x-ray magnetic spectroscopy and bulk magnetometry. We found that the magnetic properties of the LSCO layers are impacted by two competing electronic interactions occurring at the LSCO/substrate and LSMO/LSCO interfaces. For thin LSCO layers (< 5 nm), the heterostructures exist in a highly coupled state where the chemically distinct layers behave as a single magnetic compound with magnetically active Co2+ ions. As the LSCO thickness increases, a high coercivity LSCO layer develops which biases a low coercivity layer, which is composed not only of the LSMO layer, but also an interfacial LSCO layer. These results suggest a new route to tune the magnetic properties of transition metal oxide heterostructures through careful control of the interface structure.

Authors:
 [1]; ORCiD logo [1];  [2];  [3];  [1];  [4];  [2]; ORCiD logo [1]
  1. Department of Materials Science and Engineering, University of California, Davis, One Shields Ave, Davis, California 95616, USA
  2. Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd., Berkeley, California 94720, USA
  3. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
  4. Physical and Computational Science Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, USA
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL); SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1360169
Alternate Identifier(s):
OSTI ID: 1328494; OSTI ID: 1340822; OSTI ID: 1439207
Report Number(s):
PNNL-SA-119122
Journal ID: ISSN 0003-6951; APPLAB; 48583
Grant/Contract Number:  
AC05-76RL01830; AC02-05CH11231; AC02-76SF00515; 2309.001
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 109; Journal Issue: 15; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
Environmental Molecular Sciences Laboratory; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Li, Binzhi, Chopdekar, Rajesh V., N'Diaye, Alpha T., Mehta, Apurva, Byers, J. Paige, Browning, Nigel D., Arenholz, Elke, and Takamura, Yayoi. Tuning interfacial exchange interactions via electronic reconstruction in transition-metal oxide heterostructures. United States: N. p., 2016. Web. doi:10.1063/1.4964407.
Li, Binzhi, Chopdekar, Rajesh V., N'Diaye, Alpha T., Mehta, Apurva, Byers, J. Paige, Browning, Nigel D., Arenholz, Elke, & Takamura, Yayoi. Tuning interfacial exchange interactions via electronic reconstruction in transition-metal oxide heterostructures. United States. doi:10.1063/1.4964407.
Li, Binzhi, Chopdekar, Rajesh V., N'Diaye, Alpha T., Mehta, Apurva, Byers, J. Paige, Browning, Nigel D., Arenholz, Elke, and Takamura, Yayoi. Mon . "Tuning interfacial exchange interactions via electronic reconstruction in transition-metal oxide heterostructures". United States. doi:10.1063/1.4964407. https://www.osti.gov/servlets/purl/1360169.
@article{osti_1360169,
title = {Tuning interfacial exchange interactions via electronic reconstruction in transition-metal oxide heterostructures},
author = {Li, Binzhi and Chopdekar, Rajesh V. and N'Diaye, Alpha T. and Mehta, Apurva and Byers, J. Paige and Browning, Nigel D. and Arenholz, Elke and Takamura, Yayoi},
abstractNote = {The impact of interfacial electronic reconstruction on the magnetic characteristics of La0.7Sr0.3CoO3 (LSCO)/La0.7Sr0.3MnO3 (LSMO) superlattices was investigated as a function of layer thickness using a combination of soft x-ray magnetic spectroscopy and bulk magnetometry. We found that the magnetic properties of the LSCO layers are impacted by two competing electronic interactions occurring at the LSCO/substrate and LSMO/LSCO interfaces. For thin LSCO layers (< 5 nm), the heterostructures exist in a highly coupled state where the chemically distinct layers behave as a single magnetic compound with magnetically active Co2+ ions. As the LSCO thickness increases, a high coercivity LSCO layer develops which biases a low coercivity layer, which is composed not only of the LSMO layer, but also an interfacial LSCO layer. These results suggest a new route to tune the magnetic properties of transition metal oxide heterostructures through careful control of the interface structure.},
doi = {10.1063/1.4964407},
journal = {Applied Physics Letters},
number = 15,
volume = 109,
place = {United States},
year = {Mon Oct 10 00:00:00 EDT 2016},
month = {Mon Oct 10 00:00:00 EDT 2016}
}

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Works referenced in this record:

Glassy ferromagnetism and magnetic phase separation in La 1 x Sr x CoO 3
journal, May 2003