Regensburg 2019 – scientific programme

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MA: Fachverband Magnetismus

MA 26: Spin dynamics and transport

MA 26.10: Talk

Wednesday, April 3, 2019, 12:00–12:15, H37

Frequency and angular dependencies of spin-orbit-induced magnetic fields and torques — •Filipe Souza Mendes Guimarães, Manuel dos Santos Dias, and Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

Magnetization dynamics can be driven by ac electric currents through effective magnetic fields induced by the spin-orbit interaction [1]. In metallic multilayers, the precessing magnetic moment pumps spin currents to the normal metal, which is then converted back to charge currents. We have previously shown how these dynamical processes contribute to the different magnetoresistances and Hall currents of Fe/W(110) and Co/Pt(001) bilayers [2]. In this contribution, we analyze how the effective magnetic fields and the different torques acting on the magnetic moment of these bilayers depend on their rotation angle and on the frequency of the electric field. Even though the effective field acting on the magnetic layer has an ordinary non-resonant behavior, the resulting spin-orbit and external torques present complex responses in all directions. These dynamical results may help to understand switching processes and give guidance for the design of efficient heterostructures.
[1] D. Fang et al., Nat. Nanotechnol. 6, 413 (2011)
[2] F. S. M. Guimarães et al., Sci. Rep. 7, 3686 (2017)
– Funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (ERC-consolidator grant 681405 – DYNASORE).