  We observe the magnetic proximity effect (MPE) in Pt/CoFe2O4 bilayers grown
by molecular beam epitaxy. This is revealed through angle-dependent
magnetoresistance measurements at 5 K, which isolate the contributions of
induced ferromagnetism (i.e. anisotropic magnetoresistance) and spin Hall
effect (i.e. spin Hall magnetoresistance) in the Pt layer. The observation of
induced ferromagnetism in Pt via AMR is further supported by density functional
theory calculations and various control measurements including insertion of a
Cu spacer layer to suppress the induced ferromagnetism. In addition, anomalous
Hall effect measurements show an out-of-plane magnetic hysteresis loop of the
induced ferromagnetic phase with larger coercivity and larger remanence than
the bulk CoFe2O4. By demonstrating MPE in Pt/CoFe2O4, these results establish
the spinel ferrite family as a promising material for MPE and spin manipulation
via proximity exchange fields.
