Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session F40: Transport in Magnetic Materials
11:15 AM–2:15 PM,
Tuesday, March 5, 2019
BCEC
Room: 208
Sponsoring
Units:
GMAG DMP
Chair: Qiming Shao, University of California, Los Angeles
Abstract: F40.00001 : Current polarity-dependent manipulation of antiferromagnetic domains
11:15 AM–11:51 AM
Presenter:
Peter Wadley
(School of Physics and Astronomy, University of Nottingham)
Authors:
Peter Wadley
(School of Physics and Astronomy, University of Nottingham)
Sonka Reimers
(School of Physics and Astronomy, University of Nottingham)
Stuart Poole
(School of Physics and Astronomy, University of Nottingham)
Oliver Amin
(School of Physics and Astronomy, University of Nottingham)
Mu Wang
(School of Physics and Astronomy, University of Nottingham)
Joao Godinho
(Department of Spintronics and Nanoelectronics, Institute of Physic, ASCR, Prague)
Kevin Edmonds
(School of Physics and Astronomy, University of Nottingham)
Richard Champion
(School of Physics and Astronomy, University of Nottingham)
Vít Novák
(Department of Spintronics and Nanoelectronics, Institute of Physic, ASCR, Prague)
Joerg Wunderlich
(Department of Spintronics and Nanoelectronics, Institute of Physic, ASCR, Prague)
Tomas Jungwirth
(Department of Spintronics and Nanoelectronics, Institute of Physic, ASCR, Prague)
Bryan Gallagher
(School of Physics and Astronomy, University of Nottingham)
Tetragonal CuMnAs is a testbed system in which the antiferromagnetic order parameter can be switched reversibly using electrical currents (1). Previously, orthogonal in-plane current pulses were used to induce 90 degree rotations of antiferromagnetic domains in a multi-terminal geometry(2). This type of switching has now also been demonstrated in another antiferromagnet system with similar symmetry properties (4,5).
Here, we demonstrate a new mechanism by which antiferromagnetic domain walls in CuMnAs can be manipulated to realize stable and reproducible domain changes using only two electrical contacts. In this geometry, current polarity is reversed changing the sign of the current-induced fields. The resulting Néel spin orbit torque acts primarily on the domain wall. The reconfigurations are imaged using x-ray magnetic linear dichroism microscopy, and detected electrically. The switching by domain wall motion can occur at much lower current densities than coherent domain switching.
1)Jungwirth et al Nat. Nano. 11, 231–241 (2016).
2)Wadley et al. Science 351, 587-590 (2016).
4) S. Y. Bodnar et al. Nat. Commun. 9, 348 (2018)
5)Meinert et al arXiv:1706.06983
6) Wadley, P et al Nat. Nano.13, 362–365 (2018)
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