Magnetic Texture in Insulating Single Crystal High Entropy Oxide Spinel Films

Yogesh Sharma; Alessandro R. Mazza; Brianna L. Musico; Elizabeth Skoropata; Roshan Nepal; Rongying Jin; Anton V. Ievlev; Liam Collins; Zheng Gai; Aiping Chen; Matthew Brahlek; Veerle Keppens; Thomas Z. Ward

doi:10.1021/acsami.1c01344

Magnetic Texture in Insulating Single Crystal High Entropy Oxide Spinel Films

Yogesh Sharma, Alessandro R. Mazza, Brianna L. Musico, Elizabeth Skoropata, Roshan Nepal, Rongying Jin, Anton V. Ievlev, Liam Collins, Zheng Gai, Aiping Chen, Matthew Brahlek, Veerle Keppens, Thomas Z. Ward

Research output: Contribution to journal › Article › peer-review

30 Scopus citations

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 (Mg0.2Ni0.2Fe0.2Co0.2Cu0.2)Fe2O4 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.

Original language	English
Pages (from-to)	17971-17977
Number of pages	7
Journal	ACS Applied Materials and Interfaces
Volume	13
Issue number	15
DOIs	https://doi.org/10.1021/acsami.1c01344
State	Published - Apr 21 2021

Funding

The experimental design, synthesis, and structural and magnetic characterizations were supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), Materials Sciences and Engineering Division. Scanning probe microscopy and TOF-SIMS were performed as user projects at the Center for Nanophase Materials Sciences, which is sponsored at Oak Ridge National Laboratory by the Scientific User Facilities Division, BES, U.S. DOE. Y.S. acknowledges the support from the G. T. Seaborg Fellowship (project number 20210527CR) and the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy Office of Science at Los Alamos National Laboratory. Los Alamos National Laboratory, an affirmative action equal opportunity employer, is managed by Triad National Security, LLC for the U.S. Department of Energy’s NNSA, under contract 89233218CNA000001. R.N. and R.J. acknowledge the financial support by the U.S. National Science Foundation under grant no. DMR-1504226. B.L.M. acknowledges the support of the Center for Materials Processing, a Tennessee Higher Education Commission (THEC) supported Accomplished Center of Excellence.

Funders	Funder number
National Science Foundation	DMR-1504226
U.S. Department of Energy
Office of Science
Basic Energy Sciences
Los Alamos National Laboratory	89233218CNA000001
Division of Materials Sciences and Engineering	20210527CR
Center for Integrated Nanotechnologies
Tennessee Higher Education Commission

Keywords

configurational disorder
high entropy oxide
magnetic domain
scanning probe microscopy
spinel ferrite
thin-film epitaxy

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10.1021/acsami.1c01344

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title = "Magnetic Texture in Insulating Single Crystal High Entropy Oxide Spinel Films",

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 (Mg0.2Ni0.2Fe0.2Co0.2Cu0.2)Fe2O4 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.",

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AB - 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 (Mg0.2Ni0.2Fe0.2Co0.2Cu0.2)Fe2O4 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.

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Magnetic Texture in Insulating Single Crystal High Entropy Oxide Spinel Films

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