Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 2: Focus Session: Antiferromagnetic Spintronics
MA 2.6: Hauptvortrag
Montag, 20. März 2017, 11:45–12:15, HSZ 01
Current induced switching of an antiferromagnet — Peter Wadley1, Michal J. Grzybowski2, Carl Andrews1, Sonka Reimers1, Richard P. Campion1, Vit Novak3, Francesco Maccherozzi4, Sarnjeet S. Dhesi4, •Kevin W. Edmonds1, Bryan L. Gallagher1, Jakub Zelezny3, and Tomas Jungwirth3 — 1University of Nottingham, Nottingham, UK — 2Institute of Physics, Polish Academy of Sciences, Warsaw, Poland — 3Institute of Physics, Czech Academy of Sciences, Prague — 4Diamond Light Source, Oxford, UK
The pioneer of the field of antiferromagnetism, Louis Neel, noted in his Nobel lecture that while abundant and interesting from the theoretical viewpoint, antiferromagnets did not seem to have any applications. The alternating directions of magnetic moments and the resulting zero net magnetization make them difficult to detect and manipulate. Remarkably, Neel also pointed out the equivalence of antiferromagnets with ferromagnets in effects that are an even function of the magnetic moment, but an efficient means of controlling the magnetic order has been elusive. Zelezny et al predicted a mechanism, by which an alternating field-like torque can be produced in crystals of specific symmetries [1]. In some materials these torques can coincide with the spin sub-lattices of the AF, and offer the prospect of current induced switching of the spin axis. This talk reports the demonstration of electrical reading and writing of an all-AF memory device, and complementary X-PEEM imaging[2]. [1] J. Zelezny, et al., Physical Review Letters 113, 157201 (2014). [2] P. Wadley, et al., Science 351, 587-590 (2016)