Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 4: Topological insulators and spin-dependent transport phenomena

MA 4.12: Vortrag

Montag, 1. April 2019, 12:30–12:45, H52

Current induced Néel-order switching in antiferromagnetic CuMnAs deposited by magnetron sputtering — •Tristan Matalla-Wagner, Matthias Rath, Jan-Michael Schmalhorst, Günter Reiss, and Markus Meinert — Center for Spinelectronic Materials and Devices, Bielefeld University, Germany

Antiferromagnets which fulfill certain symmetry properties allow for an intrinsic relativistic Néel-order spin-orbit torque (NSOT) driven by an electrical current [1]. The antiferromagnetically coupled sublattices of tetragonal CuMnAs are inversion partners and, thus, can experience a NSOT which can reorient the Néel-vector L perpendicular to the applied charge current [2]. Therefore, this material is suitable to manufacture novel antiferromagnetic memory devices that are extraordinarily robust against external influences [3]. Here, we report on our experiments on the electrical switching of the Néel-order using short current pulses in highly oriented films of CuMnAs, deposited using dc-magnetron sputtering. The dependence of the switching efficiency on the sample temperature, current density and pulse width is examined. Our findings corroborate the hypothesis of a thermally activated switching of L in sputtered CuMnAs, similar to the switching of sputtered Mn2Au [4].

[1] J. Železný et al., Phys. Rev. Lett. 113, 157201 (2014)

[2] P. Wadley et al., Science 351, 587 (2016)

[3] T. Jungwirth et al., Nat. Nanotechn. 11, 231 (2016)

[4] M. Meinert et al., Phys. Rev. Applied 9, 064040 (2018)

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