Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 12: Skyrmions I

MA 12.11: Talk

Monday, March 18, 2024, 17:45–18:00, EB 301

Skyrmonic device for three dimensional magnetic field sensing enabled by spin-orbit torques — •Sabri Koraltan and Dieter Suess — Physics of Functional Materials, Faculty of Physics, University of Vienna, Vienna, Austria

Magnetic skyrmions are topologically protected magnetic solitons that are promising for storage or computing applications. In this work, we demonstrate that we can use a skyrmion device based on [W/CoFeB/MgO]xN multilayers for three-dimensional field sensing enabled by spin-orbit torques (SOT). We stabilize isolated chiral skyrmions and stripe domains in the multilayers, as shown by magnetic-force microscopy images and micromagnetic simulations. We perform magnetic transport measurements to show that we can sense both in and out-of-plane magnetic fields by a differential measurement scheme in which the symmetry of the SOT leads to cancellation of the DC offset. With the magnetic parameters obtained with vibrating sample magnetometry and ferromagnetic resonance measurements, we perform micromagnetic simulations where we investigate the fundamental origin of the sensing signal. That is, the topological transformation between skyrmions and stripes leading to an increase in the transverse voltage due to the anomalous and topological Hall effects.

Keywords: Skyrmions; Spin-Orbit Torques; Magnetic Field Sensing