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

Journal Article · · npj Quantum Materials

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.

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:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); State of North Carolina; Flatiron Institute’s Scientific Computing Core
Grant/Contract Number:
AC02-05CH11231; DMR-1751455; DMR-1350273; AC02-06CH11357; ECCS-1542015
OSTI ID:
1619712
Alternate ID(s):
OSTI ID: 1542994
Journal Information:
npj Quantum Materials, Journal Name: npj Quantum Materials Vol. 4 Journal Issue: 1; ISSN 2397-4648
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

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