SKM 2021 – scientific programme
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MA: Fachverband Magnetismus
MA 8: INNOMAG e.V. Dissertationspreis / Ph.D. Thesis Prize (2020)
MA 8.2: Talk
Wednesday, September 29, 2021, 10:25–10:50, H2
Highly Efficient Domain Wall Motion in Ferrimagnetic Bi-layer Systems at the Angular Momentum Compensation Temperature — •Robin Bläsing — RWTH Aachen University, Aachen, Germany
Within the last decade, the efficiency of current-induced motion of magnetic domain walls (DWs) has been enhanced tremendously by utilizing the exchange coupling torque (ECT) in synthetic antiferromagnetic structures. The focus of the present study is on exploring this mechanism in ferrimagnetic layers consisting of a transition metal layer and a rare earth metal layer which couple antiferromagnetically. The DWs are moved by nanosecond-long current pulses and their velocity is determined by using Kerr microscopy at various temperatures. It is shown here that the motion is most efficient at a certain temperature TA at which the angular momenta of both layers compensate each other and the ECT is maximized. Since the device temperature is significantly increased by the current pulses, taking into account Joule heating is of major importance when determining TA. The results of current-induced domain wall motion in the present thesis can be used for the development of novel storage devices and improving their efficiency.