Title

Magnetic Texture in Insulating Single Crystal High Entropy Oxide Spinel Films

Authors

Yogesh Sharma, Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.
Alessandro R. Mazza, Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.
Brianna L. Musico, Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States.
Elizabeth Skoropata, Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.
Roshan Nepal, Department of Physics & Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States.
Rongying Jin, Department of Physics & Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States.
Anton V. Ievlev, Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.
Liam Collins, Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.
Zheng Gai, Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.
Aiping Chen, Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States.
Matthew Brahlek, Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.
Veerle Keppens, Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States.
Thomas Z. Ward, Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.

Document Type

Article

Publication Date

4-21-2021

Abstract

Magnetic insulators are important materials for a range of next-generation memory and spintronic applications. Structural constraints in this class of devices generally require a clean heterointerface that allows effective magnetic coupling between the insulating layer and the conducting layer. However, there are relatively few examples of magnetic insulators that can be synthesized with surface qualities that would allow these smooth interfaces and precisely tuned interfacial magnetic exchange coupling, which might be applicable at room temperature. In this work, we demonstrate an example of how the configurational complexity in the magnetic insulator layer can be used to realize these properties. The entropy-assisted synthesis is used to create single-crystal (MgNiFeCoCu)FeO films on substrates spanning a range of strain states. These films show smooth surfaces, high resistivity, and strong magnetic responses at room temperature. Local and global magnetic measurements further demonstrate how strain can be used to manipulate the magnetic texture and anisotropy. These findings provide insight into how precise magnetic responses can be designed using compositionally complex materials that may find application in next-generation magnetic devices.

Publication Source (Journal or Book title)

ACS applied materials & interfaces

First Page

17971

Last Page

17977

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