Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 26: Spin dynamics and transport
MA 26.4: Vortrag
Mittwoch, 3. April 2019, 10:15–10:30, H37
Electric-field control of spin-orbit torques CoFeB thin films — •Mariia Filianina1,2, Jan-Philipp Hanke1,3, Kyujoon Lee1, Dong-Soo Han1, Yuriy Mokrousov1,3, and Mathias Kläui1,2 — 1Institute of Physics, Johannes Gutenberg University, Mainz, Germany — 2Graduate School of Excellence Material Science in Mainz, Mainz, Germany — 3Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, Jülich, Germany
Energy-efficient control of magnetization via electric fields has attracted significant interest. These so-called magneto-electric effects have been studied in various systems with the focus put on the manipulations of magnetic anisotropies [1]. However, electric field effects to tune current-induced spin-orbit torques (SOTs) for magnetization switching, which is crucial for spintronics applications, has been little investigated [2].
Here we report on strain-controlled SOTs in perpendicularly magnetized W/CoFeB/MgO multilayers grown on a piezoelectric substrate. The SOTs are evaluated by magnetotransport and second-harmonic methods [3] under different in-plane strains. We find that the strain leads to a non-trivial change in field-like and damping-like torques. We compare our experimental results with theoretical ab initio calculations and uncover the microscopic origin of the observed strain effects on the magneto-electric coupling.
1. S. Finizio et al., Phys. Rev. Appl., Vol. 1, p. 021001 (2014). 2. K. Cai et al., Nat. Mater., Vol. 16, p. 712 (2017). 3. T. Schulz et al., Phys. Rev. B, Vol. 95, p. 224409 (2017).