Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 2: Focus Session: Antiferromagnetic Spintronics

MA 2.4: Hauptvortrag

Montag, 20. März 2017, 11:00–11:30, HSZ 01

Staggering antiferromagnetic domain wall velocity in a staggered spin-orbit field — •Olena Gomonay — Institut für Physik, Johannes Gutenberg Universität Mainz, D-55099 Mainz, Germany

Future applications of antiferromagnets (AFs) in many spintronics devices rely on the precise manipulation of domain walls. Here we discuss different approaches to manipulate and control the domain walls in AF. We demonstrate the possibility to drive an AF domain-wall at high velocities by field-like Néel spin-orbit torques. Such torques arise from the current-induced local fields that alternate their orientation on each sub-lattice of the AF and whose orientation depend primarily on the current direction, giving them their field-like character. The domain-wall velocities that can be achieved by this mechanism are two orders of magnitude greater than the ones in ferromagnets. This arises from the efficiency of the staggered spin-orbit fields to couple to the order parameter and from the exchange-enhanced phenomena in AF texture dynamics, which leads to a low domain-wall effective mass and the absence of a Walker break-down limit. We also discuss other possibilities based on application of spin-polarised current and/or time-dependent magnetic field. We believe that our approaches pave a way for the development of AF-based devices based on controlled motion of AF domain walls.