Hanle Magnetoresistance in Thin Metal Films with Strong Spin-Orbit Coupling

We report measurements of a new type of magnetoresistance in Pt and Ta thin films. The spin accumulation created at the surfaces of the film by the spin Hall effect decreases in a magnetic field because of the Hanle effect, resulting in an increase of the electrical resistance as predicted by Dyakonov [Phys. Rev. Lett. 99, 126601 (2007)]. 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.Received 16 February 2015DOI:https://doi.org/10.1103/PhysRevLett.116.016603© 2016 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasMagnetoresistanceSpin-orbit couplingPhysical SystemsMagnetic insulatorsThin filmsTechniquesTransport techniquesCondensed Matter, Materials & Applied Physics