Regensburg 2016 – scientific programme
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DS: Fachverband Dünne Schichten
DS 39: Resistive Effects I
DS 39.6: Talk
Thursday, March 10, 2016, 10:45–11:00, H8
Hanle magnetoresistance in thin metal films with strong spin-orbit coupling — Saül Vélez1, •Vitaly Golovach2,3,4, Amilcar Bedoya-Pinto1, Miren Isasa1, Edurne Sagasta1, Mikel Abadia2,3, Celia Rogero2,3, Luis Hueso1,4, Sebastian Bergeret2,3, and Fèlix Casanova1,4 — 1CIC nanoGUNE, 20018 Donostia-San Sebastián, Basque Country, Spain — 2Centro de Física de Materiales (CFM-MPC), Centro Mixto CSIC-UPV/EHU, 20018 Donostia-San Sebastián, Basque Country, Spain — 3Donostia International Physics Center (DIPC), 20018 Donostia-San Sebastián, Basque Country, Spain — 4IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Basque Country, Spain
The theory of Hanle magnetoresistance is worked out and applied to thin metal films with strong spin-orbit interaction, exhibiting the spin Hall effect. A correction to the resistivity tensor is derived and analyzed for the case of a classically weak magnetic field. The spin accumulation created at the surfaces of the film by the spin Hall effect decreases with the magnetic field because of the Hanle effect, resulting in an increase of the electrical resistance. The angular dependence of this magnetoresistance resembles the recently discovered spin Hall magnetoresistance in Pt/Y3Fe5O12 bilayers, although the presence of a ferromagnetic insulator is not required. We show that this Hanle magnetoresistance is an alternative, simple way to quantitatively study the coupling between charge and spin currents in metals with strong spin-orbit coupling. The theory is compared against experiments carried out for Pt and Ta thin films.