期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 15, 页码 17971-17977出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c01344
关键词
spinel ferrite; configurational disorder; high entropy oxide; thin-film epitaxy; magnetic domain; scanning probe microscopy
资金
- U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), Materials Sciences and Engineering Division
- Oak Ridge National Laboratory by the Scientific User Facilities Division, BES, U.S. DOE
- G. T. Seaborg Fellowship [20210527CR]
- Center for Integrated Nanotechnologies, an Office of Science User Facility
- U.S. Department of Energy's NNSA [89233218CNA000001]
- U.S. National Science Foundation [DMR-1504226]
- Center for Materials Processing, a Tennessee Higher Education Commission (THEC) - Accomplished Center of Excellence
This study investigates the synthesis and properties of magnetic insulators, revealing how configurational complexity can be utilized to achieve smooth interfaces and precise tuning of interfacial magnetic exchange coupling. Single-crystal films with high resistivity and strong magnetic response were successfully prepared using entropy-assisted synthesis.
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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