1. Current-Induced Domain Wall Motion in a Compensated Ferrimagnet
- Author
-
Caroline A. Ross, Jiahao Han, Saima Afroz Siddiqui, Joseph Finley, and Luqiao Liu
- Subjects
Physics ,Condensed Matter - Materials Science ,Angular momentum ,Condensed matter physics ,Spintronics ,Materials Science (cond-mat.mtrl-sci) ,FOS: Physical sciences ,General Physics and Astronomy ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Chirality (electromagnetism) ,Domain (software engineering) ,Magnetization ,Domain wall (magnetism) ,Ferrimagnetism ,0103 physical sciences ,Condensed Matter::Strongly Correlated Electrons ,010306 general physics ,0210 nano-technology ,Spin-½ - Abstract
Due to the difficulty in detecting and manipulating magnetic states of antiferromagnetic materials, studying their switching dynamics using electrical methods remains a challenging task. In this work, by employing heavy metal/rare earth-transition metal alloy bilayers, we experimentally studied current-induced domain wall dynamics in an antiferromagnetically coupled system. We show that the current-induced domain wall mobility reaches a maximum close to the angular momentum compensation. With experiment and modelling, we further reveal the internal structures of domain walls and the underlying mechanisms for their fast motion. We show that the chirality of the ferrimagnetic domain walls remains the same across the compensation points, suggesting that spin orientations of specific sublattices rather than net magnetization determine Dzyaloshinskii-Moriya interaction in heavy metal/ferrimagnet bilayers. The high current-induced domain wall mobility and the robust domain wall chirality in compensated ferrimagnetic material opens new opportunities for high-speed spintronic devices., Comment: 13 pages, 3 figures
- Published
- 2018