Hidden Interface Driven Exchange Coupling in Oxide Heterostructures
Source abstract
Abstract
A variety of emergent phenomena have been enabled by interface engineering in complex oxides. The existence of an intrinsic interfacial layer has often been found at oxide heterointerfaces. However, the role of such an interlayerin controlling functionalities is not fully explored. Here, we report the control of the exchange bias (EB) in single‐phase manganite thin films with nominallyuniform chemical composition across the interfaces. The sign of EB depends on the magnitude of the cooling field. A pinned layer, confirmed by polarized neutron reflectometry, provides the source of unidirectional anisotropy. The origin of the exchange bias coupling is discussed in terms of magnetic interactions between the interfacial ferromagnetically reduced layer and the bulk ferromagnetic region. The sign of EB is related to the frustration of antiferromagnetic coupling between the ferromagnetic region and the pinned layer. Our results shed new light on using oxide interfaces to design functional spintronic devices.
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Research context
OpenAlex topics: Magnetic and transport properties of perovskites and related materials · Electronic and Structural Properties of Oxides · Advanced Condensed Matter Physics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Center for Integrated Nanotechnologies (CINT) Los Alamos National Laboratory Los Alamos NM 87545 USA
Materials Science Division Argonne National Laboratory Argonne IL 60439 USA
Department of Physics and Astronomy West Virginia University Morgantown WV 26506 USA
Quantum Condensed Matter Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA
Department of Physics and Astronomy University of Tennessee Knoxville TN 37996 USA
Department of Materials Science University of Cambridge Cambridge CB3 OFS UK
Department of Materials Design and Innovation University at Buffalo ‐ The State University of New York Buffalo NY 14260 USA
Funding
U.S. Department of Energy · Engineering and Physical Sciences Research Council · Leverhulme Trust
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