Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 31: Focus Session: Spin-Orbit Torque at Surfaces and Interfaces

MA 31.1: Topical Talk

Mittwoch, 2. April 2014, 15:00–15:30, BEY 118

Magnetization switching and spin-orbit torques in AlOx/Co/Pt and MgO/CoFeB/Ta layers — •Pietro Gambardella — Department of Materials, ETH Zurich

Spin-orbit torques induced by spin Hall and Rashba-like effects in heavy metal/ferromagnetic bilayers allow for magnetization switching based on in-plane current injection. Using this geometry, we demonstrate deterministic magnetization reversal induced by sub-ns current pulses in 100 to 200 nm sized dots and discuss the switching efficiency as a function of pulse duration. Further, we present vector measurements of the longitudinal and transverse spin-orbit torques in AlOx/Co/Pt and MgO/CoFeB/Ta trilayers using harmonic analysis of the anomalous and planar Hall effects, providing evidence for strongly anisotropic field-like and spin transfer-like components that are compatible with the symmetry of the trilayers. The switching efficiency and relative magnitude of the longitudinal and transverse torques are analyzed in annealed MgO/CoFeB/Ta trilayers as a function of magnetization, magnetic anisotropy, and resistivity.