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Title: Confinement of magnetism in atomically thin La 0.7Sr 0.3CrO 3/La 0.7Sr 0.3MnO 3 heterostructures

Abstract

At crystalline interfaces where a valence-mismatch exists, electronic, and structural interactions may occur to relieve the polar mismatch, leading to the stabilization of non-bulk-like phases. We show that spontaneous reconstructions at polar La 0.7Sr 0.3MnO 3 interfaces are correlated with suppressed ferromagnetism for film thicknesses on the order of a unit cell. We investigate the structural and magnetic properties of valence-matched La 0.7Sr 0.3CrO 3/La 0.7Sr 0.3MnO 3 interfaces using a combination of high-resolution electron microscopy, first principles theory, synchrotron X-ray scattering and magnetic spectroscopy and temperature-dependent magnetometry. A combination of an antiferromagnetic coupling between the La 0.7Sr 0.3CrO 3 and La 0.7Sr 0.3MnO 3 layers and a suppression of interfacial polar distortions are found to result in robust long-range ferromagnetic ordering for ultrathin La 0.7Sr 0.3MnO 3. These results underscore the critical importance of interfacial structural and magnetic interactions in the design of devices based on two-dimensional oxide magnetic systems.

Authors:
 [1];  [2];  [1];  [1];  [3]; ORCiD logo [4]
  1. North Carolina State Univ., Raleigh, NC (United States)
  2. Flatiron Inst., New York, NY (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  4. North Carolina State Univ., Raleigh, NC (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Sponsoring Org.:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); State of North Carolina; Flatiron Institute’s Scientific Computing Core
OSTI Identifier:
1542994
Grant/Contract Number:  
[DMR-1751455; DMR-1350273; AC02-05CH11231; AC02-06CH11357; ECCS-1542015]
Resource Type:
Accepted Manuscript
Journal Name:
npj Quantum Materials
Additional Journal Information:
[ Journal Volume: 4; Journal Issue: 1]; Journal ID: ISSN 2397-4648
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; Magnetic properties and materials; Theory and computation

Citation Formats

Koohfar, Sanaz, Georgescu, Alexandru B., Penn, Aubrey N., LeBeau, James M., Arenholz, Elke, and Kumah, Divine P. Confinement of magnetism in atomically thin La0.7Sr0.3CrO3/La0.7Sr0.3MnO3 heterostructures. United States: N. p., 2019. Web. doi:10.1038/s41535-019-0164-1.
Koohfar, Sanaz, Georgescu, Alexandru B., Penn, Aubrey N., LeBeau, James M., Arenholz, Elke, & Kumah, Divine P. Confinement of magnetism in atomically thin La0.7Sr0.3CrO3/La0.7Sr0.3MnO3 heterostructures. United States. doi:10.1038/s41535-019-0164-1.
Koohfar, Sanaz, Georgescu, Alexandru B., Penn, Aubrey N., LeBeau, James M., Arenholz, Elke, and Kumah, Divine P. Wed . "Confinement of magnetism in atomically thin La0.7Sr0.3CrO3/La0.7Sr0.3MnO3 heterostructures". United States. doi:10.1038/s41535-019-0164-1. https://www.osti.gov/servlets/purl/1542994.
@article{osti_1542994,
title = {Confinement of magnetism in atomically thin La0.7Sr0.3CrO3/La0.7Sr0.3MnO3 heterostructures},
author = {Koohfar, Sanaz and Georgescu, Alexandru B. and Penn, Aubrey N. and LeBeau, James M. and Arenholz, Elke and Kumah, Divine P.},
abstractNote = {At crystalline interfaces where a valence-mismatch exists, electronic, and structural interactions may occur to relieve the polar mismatch, leading to the stabilization of non-bulk-like phases. We show that spontaneous reconstructions at polar La0.7Sr0.3MnO3 interfaces are correlated with suppressed ferromagnetism for film thicknesses on the order of a unit cell. We investigate the structural and magnetic properties of valence-matched La0.7Sr0.3CrO3/La0.7Sr0.3MnO3 interfaces using a combination of high-resolution electron microscopy, first principles theory, synchrotron X-ray scattering and magnetic spectroscopy and temperature-dependent magnetometry. A combination of an antiferromagnetic coupling between the La0.7Sr0.3CrO3 and La0.7Sr0.3MnO3 layers and a suppression of interfacial polar distortions are found to result in robust long-range ferromagnetic ordering for ultrathin La0.7Sr0.3MnO3. These results underscore the critical importance of interfacial structural and magnetic interactions in the design of devices based on two-dimensional oxide magnetic systems.},
doi = {10.1038/s41535-019-0164-1},
journal = {npj Quantum Materials},
number = [1],
volume = [4],
place = {United States},
year = {2019},
month = {5}
}

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