Magnetic proximity effect in Pt/CoFe2O4 bilayers

The magnetic proximity effect (MPE) is an important phenomenon for spin manipulation in spintronic devices, but to this date, researchers have been unable to demonstrate MPE using spinel ferrites, a versatile class of ferrimagnetic insulators with high Curie temperatures. In this study, magnetotransport measurements on platinum-cobalt ferrite bilayers demonstrate the presence of MPE, which results in induced ferromagnetic order in the platinum films. In contrast to earlier studies, the entire structure is grown by molecular beam epitaxy, which ensures the cleanest possible interfaces. These results enable the use of spinel ferrites for spin manipulation in future spin-logic devices.