Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 42: Posters Magnetism I
MA 42.37: Poster
Wednesday, March 18, 2020, 15:00–18:00, P3
Piezoelectric Strain Control of Spin-Orbit Torques in CoFeB Thin Films — •M. Filianina1, J.-P. Hanke1,3, K. Lee1, D.-S. Han1, S. Jaiswal1,4, G. Jakob1, A. Rajan1, Y. Mokrousov1,3, and M. 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 — 4Singulus Technology AG, Kahl am Mainz, Germany
Energy-efficient control of magnetization in nanoscale is fundamental for designing future generation spintronic devices. In recent years current-induced magnetization switching via spin-orbit torques (SOTs), realized in ferromagnet/heavy metal bilayers, has emerged as one of the most promising approaches. The magnitude and the sign of the SOTs can be engineered by adjusting the system parameters. However, the SOTs are set once the device is fabricated, while in the light of potential applications the dynamical control of the SOTs is desired.
Here we demonstrate dynamic control of SOTs in perpendicularly magnetized W/CoFeB/MgO multilayers by electric field-induced strain. We find that modulated by an electric field tensile strain leads to a significant increase of the damping-like (DL) torque, while the compressive strain leads to its decrease. The field-like (FL) torque remains largely unaffected by strain. We compare our experimental results with theoretical ab initio calculations which explain the difference in the response of the FL and DL torques to the strain.