Current polarity-dependent manipulation of antiferromagnetic domains

Wadley, Peter; Reimers, Sonka; Grzybowski, Michal J.; Andrews, Carl; Wang, Mu; Chauhan, Jasbinder; Gallagher, Bryan L.; Campion, Richard P.; Edmonds, Kevin W.; Dhesi, Sarnjeet S.; Maccherozzi, Francesco; Nov�k, V.; Wunderlich, Joerg; Jungwirth, Tomas

Abstract

Antiferromagnets have several favourable properties as active elements in spintronic devices, 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. In previous experiments, orthogonal in-plane current pulses were used to induce 90° rotations of antiferromagnetic domains and demonstrate the operation of all-electrical memory bits in a multi-terminal geometry. Here, we demonstrate that antiferromagnetic domain walls can be manipulated to realize stable and reproducible domain changes using only two electrical contacts. This is achieved by using the polarity of the current to switch the sign of the current-induced effective field acting on the antiferromagnetic sublattices. The resulting reversible domain and domain wall reconfigurations are imaged using X-ray magnetic linear dichroism microscopy, and can also be detected electrically. Switching by domain-wall motion can occur at much lower current densities than those needed for coherent domain switching.

Citation

Wadley, P., Reimers, S., Grzybowski, M. J., Andrews, C., Wang, M., Chauhan, J., Gallagher, B. L., Campion, R. P., Edmonds, K. W., Dhesi, S. S., Maccherozzi, F., Novák, V., Wunderlich, J., & Jungwirth, T. (2018). Current polarity-dependent manipulation of antiferromagnetic domains. Nature Nanotechnology, 13(5), 362-365. https://doi.org/10.1038/s41565-018-0079-1

• Journal Article Type: Article
• Acceptance Date: Jan 25, 2018
• Online Publication Date: Mar 12, 2018
• Publication Date: 2018-05
• Deposit Date: Mar 14, 2018
• Publicly Available Date: Sep 13, 2018
• Journal: Nature Nanotechnology
• Print ISSN: 1748-3387
• Electronic ISSN: 1748-3395
• Publisher: Nature Publishing Group
• Peer Reviewed: Peer Reviewed
• Volume: 13
• Issue: 5
• Pages: 362-365
• DOI: https://doi.org/10.1038/s41565-018-0079-1
• Keywords: Applied physics; Condensed-matter physics; Electronics, photonics and device physics; Nanoscale devices; Nanoscale materials
• Public URL: https://nottingham-repository.worktribe.com/output/919562
• Publisher URL: https://www.nature.com/articles/s41565-018-0079-1
• Additional Information: Received: 7 November 2017; Accepted: 25 January 2018; First Online: 12 March 2018; : The authors declare no competing interests.
• Contract Date: Mar 14, 2018