Title
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High- interfacial ferromagnetism in superlattices
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Author
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Abstract
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Heterostructures of strongly correlated oxides demonstrate various intriguing and potentially useful interfacial phenomena. LaMnO3/SrMnO3 superlattices are presented showcasing a new high-temperature ferromagnetic phase with Curie temperature, TC≈360 K, caused by electron transfer from the surface of the LaMnO3 donor layer into the neighboring SrMnO3 acceptor layer. As a result, the SrMnO3 (top)/LaMnO3 (bottom) interface shows an enhancement of the magnetization as depth-profiled by polarized neutron reflectometry. The length scale of charge transfer, λTF≈2 unit cells, is obtained from in situ growth monitoring by optical ellipsometry, supported by optical simulations, and further confirmed by high resolution electron microscopy and spectroscopy. A model of the inhomogeneous distribution of electron density in LaMnO3/SrMnO3 layers along the growth direction is concluded to account for a complex interplay between ferromagnetic and antiferromagnetic layers in superlattices |
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Language
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English
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Source (journal)
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Advanced functional materials. - Weinheim
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Publication
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Weinheim
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2019
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ISSN
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1616-301X
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DOI
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10.1002/ADFM.201808270
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Volume/pages
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(2019)
, p. 1-11
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Article Reference
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1808270
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ISI
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000535358900008
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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Full text (publisher's version - intranet only)
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