Regensburg 2019 – wissenschaftliches Programm
MA 36.1: Vortrag
Mittwoch, 3. April 2019, 15:00–15:15, H53
Electrical control of antiferromagnetic domain walls — •Sonka Reimers1,2, Peter Wadley1, Richard P. Campion1, Francesco Maccherozzi2, Sarnjeet S. Dhesi2, and Kevin W. Edmonds1 — 1University of Nottingham, United Kingdom — 2Diamond Light Source, United Kingdom
Antiferromagnets have a number of favourable properties as active elements including ultra-fast dynamics, zero stray fields and insensitivity to external magnetic fields. Tetragonal CuMnAs is a testbed system in which the antiferromagnetic order parameter can be switched reversibly at ambient conditions using electrical currents. Previous experiments used orthogonal in-plane current pulses to induce 90° rotations of antiferromagnetic domains and terahertz electrical writing speeds have been demonstrated.
Here, we demonstrate that antiferromagnetic domain walls can be manipulated to realize stable and reproducible domain changes by reversing the polarity of the current only. The resulting Néel spin orbit torque acts primarily on the domain wall. The reversible domain and domain wall reconfigurations are imaged using x-ray magnetic linear dichroism microscopy, and can also be detected electrically. The switching by domain wall motion can occur at much lower current densities than those needed for coherent domain switching.
References:  Jungwirth, T. et al., Nat. Nanotechnol. 11 (2016).  Wadley, P. et al., Science 351 (2016).  Olejník, K. et al., Science Advances 4(3), (2018).  Wadley, P., Reimers, S. et al., Nat. Nanotechnol. 13(5), (2018).