Confinement of magnetism in atomically thin La0.7Sr0.3CrO3/La0.7Sr0.3MnO3 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 0.7 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
Web of Science
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