Miren Isasa, Amilcar Bedoya-Pinto, Federico Golmar, Luis E. Hueso, Josep Fontcuberta, Fèlix Casanova
We report magnetoresistance measurements on thin Pt bars grown on epitaxial (001) and (111) CoFe2O4 (CFO) ferrimagnetic insulating films. The results can be described in terms of spin Hall magnetoresistance (SMR). Spin mixing conductance is found to be largely different depending on CFO film orientation with record values for (001) CFO, which might reflect the strong spin-orbit coupling of Co2+ ions. Moreover, analysis of the field-dependent longitudinal and transverse magnetoresistance indicates that SMR contains a contribution that does not follow the bulk magnetization of CFO but it is a fingerprint of the surface magnetism of the CFO layer, thus signaling SMR as a tool for mapping interface magnetization.
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http://arxiv.org/abs/1307.1267
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