Confinement of magnetism in atomically thin La0.7Sr0.3CrO3/La0.7Sr0.3MnO3 heterostructures

Koohfar, Sanaz; Georgescu, Alexandru B.; Penn, Aubrey N.; LeBeau, James M.; Arenholz, Elke; Kumah, Divine P.

doi:10.1038/s41535-019-0164-1

Confinement of magnetism in atomically thin La0.7Sr0.3CrO3/La0.7Sr0.3MnO3 heterostructures

Journal Article · Wed May 29 00:00:00 EDT 2019 · npj Quantum Materials

DOI:https://doi.org/10.1038/s41535-019-0164-1· OSTI ID:1619712

Koohfar, Sanaz; Georgescu, Alexandru B.; Penn, Aubrey N.; LeBeau, James M.; Arenholz, Elke;

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 _0.7 Sr _0.3 MnO 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 _0.7 Sr _0.3 CrO ₃ /La _0.7 Sr _0.3 MnO 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 _0.7 Sr _0.3 CrO ₃ and La _0.7 Sr _0.3 MnO ₃ layers and a suppression of interfacial polar distortions are found to result in robust long-range ferromagnetic ordering for ultrathin La _0.7 Sr _0.3 MnO 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.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Sponsoring Organization:: Flatiron Institute’s Scientific Computing Core; National Science Foundation (NSF); State of North Carolina; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231; AC02-06CH11357

OSTI ID:: 1619712

Alternate ID(s):: OSTI ID: 1542994

Journal Information:: npj Quantum Materials, Journal Name: npj Quantum Materials Journal Issue: 1 Vol. 4; ISSN 2397-4648

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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