Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 67: Poster 4

MA 67.13: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG3

Magneto-optic investigation of spin-orbit torques in metallic bilayers — •Robert Islinger, Martin Decker, Johannes Stigloher, Martin Buchner, and Christian Back — Universität Regensburg, Deutschland

We study the spin-orbit torque (SOT) generated when applying a current to micrometer-sized ferromagnetic metal/heavy metal (FM/HM) stripes. We use the magneto-optic Kerr effect in a static experiment. A polarized laser beam is used to probe the out-of-plane component of the magnetization while scanning across the sample [1]. When applying an alternating current to the stripe, the equilibrium position of the magnetization changes which we detect magneto-optically. The field generated by the SO-interaction switches sign when inverting the equilibrium direction of the magnetization using an externally applied magnetic field while the contribution from the current induced Oersted field remains unchanged. Subtracting the detected voltage signals give access to the magnitude of the SOT. The material-related SOT coefficient beta can be derived and is compared for different FM/HM systems. Temperature dependent measurements down to 10K are performed to provide an insight into the temperature behavior of the SOTs. [1] Fan et al. Quantifying interface and bulk contributions to spin-orbit torque in magnetic bilayers, Nat.Comm 5, 3042 (2014)