Highly Efficient Domain Wall Motion in Ferrimagnetic Bi-layer Systems at the 
Angular Momentum Compensation Temperature

Bläsing, Robin

doi:10.25673/32178

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Highly Efficient Domain Wall Motion in Ferrimagnetic Bi-layer Systems at the Angular Momentum Compensation Temperature

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Bläsing, Robin
International Max Planck Research School for Science and Technology of Nano-Systems, Max Planck Institute of Microstructure Physics, Max Planck Society;
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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https://opendata.uni-halle.de//handle/1981185920/32341
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Citation

Bläsing, R. (2019). Highly Efficient Domain Wall Motion in Ferrimagnetic Bi-layer Systems at the Angular Momentum Compensation Temperature. PhD Thesis, Martin-Luther-Universität Halle-Wittenberg, Halle (Saale).

Cite as: https://hdl.handle.net/21.11116/0000-0010-801D-D

Abstract

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. In the present study this ECT mechanism is explored in a ferrimagnetic bi-layers consisting of a Co and a Gd 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. A low threshold current density is required to move DWs in this Co/Gd bi-layer. It is shown that the motion is most efficient at a certain temperature TA at which the angular momenta of both layers compensate each other. 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 this thesis can be used for the development of novel storage devices and improving their efficiency.