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MA: Fachverband Magnetismus
MA 35: Spintronics (other effects) (joint session MA/TT)
MA 35.3: Vortrag
Mittwoch, 11. März 2026, 15:45–16:00, POT/0112
Magnetic Domain Wall Motion under Microwave Excitation — •Lukas Fischer1, Rouven Dreyer2, Jae-Chun Jeon1, Georg Woltersdorf2, and Stuart Parkin1 — 1Max-Planck Institute of Microstructure Physics, Halle (Saale), Germany — 2Martin-Luther-University Halle-Wittenberg, Halle (Saale), Germany
Chiral domain walls (DWs) and their synchronous motion via current pulses in magnetic conduits (so-called magnetic racetracks) are of enormous interest due to their fast speed, non-volatility, and capability of creating high bit-density for advanced memory and logic technologies. Most experimental and numerical studies have focused on the motion of the DWs by spin-orbit torque using nanosecond-long current pulses which are not efficient in coupling to magnetization precessions of the magnetic material, typically occurring in the GHz regime.
Here we present that the microwave excitation of chiral Néel DWs in a magnetic microwire with perpendicular magnetic anisotropy significantly impacts the DW motion. We use either magnetic fields or electrical currents at RF-frequencies to explore the pronounced impact on the DW motion. Firstly, we directly visualize the high-frequency response of the DW by using the Super-Nyquist sampling magneto-optical Kerr effect. We then determine the effect of this excitation on the DW motion. When the DW is excited in the presence of a static, transverse magnetic field, it exhibits unidirectional self-propulsion. Moreover, the resonant excitation in a static, longitudinal field leads to a current-triggered, sustained DW motion over micrometer distances, which dramatically increases the effective DW displacement.
Keywords: Spintronics; Spin dynamics; Magnetic domain wall; Microwave excitation; Magnetic thin films