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Magnetic insulators are important materials for a range of next generationmemory and spintronic applications. Structural constraints in this class ofdevices generally require a clean heterointerface that allows effectivemagnetic coupling between the insulating layer and the conducting layer.However, there are relatively few examples of magnetic insulators which can besynthesized with surface qualities that would allow these smooth interfaces andprecisely tuned interfacial magnetic exchange coupling which might beapplicable at room temperature. In this work, we demonstrate an example of howthe configurational complexity in the magnetic insulator layer can be used torealize these properties. The entropy-assisted synthesis is used to createsingle crystal (Mg0.2Ni0.2Fe0.2Co0.2Cu0.2)Fe2O4 films on substrates spanning arange of strain states. These films show smooth surfaces, high resistivity, andstrong magnetic responses at room temperature. Local and global magneticmeasurements further demonstrate how strain can be used to manipulate magnetictexture and anisotropy. These findings provide insight into how precisemagnetic responses can be designed using compositionally complex materials thatmay find application in next generation magnetic devices.

Magnetic Texture in Insulating Single Crystal High Entropy Oxide Spinel Films