Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 64: Poster 1

MA 64.31: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-EG

Thin films of the room temperature antiferromagnet CuMnAs deposited by magnetron sputtering — •Tristan Matalla-Wagner, Dario Linsen, Jan-Michael Schmalhorst, Timo Kuschel, Markus Meinert, and Günter Reiss — Center for Spinelectronic Materials and Devices, Bielefeld University, Germany

Antiferromagnets (AFM) are barely affected by external magnetic fields and their magnetic properties are notoriously difficult to manipulate and detect. However, it was recently demonstrated that the metastable tetragonal phase of CuMnAs fulfills the symmetry requirements for an intrinsic spin-orbit torque, that allows magnetization switching with current pulses of moderate density and magnetization read-out by the planar Hall effect [1]. Therefore, this material holds promise to manufacture novel antiferromagnetic memory devices that are extraordinarily robust against external influences [2]. Tetragonal CuMnAs is specifically promising due to its Néel temperature being well above room-temperature [3]. It was demonstrated that high quality CuMnAs films can be grown in the tetragonal phase on GaAs and GaP substrates by molecular beam epitaxy [4]. Here, we present the results of our recent progress to deposit CuMnAs films on GaAs (001) substrates by magnetron sputtering and discuss structural, magnetic, and electrical properties of the films.

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

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

[3] F. Máca et al., J. Magn. Magn. Mater. 324 1606 (2012)

[4] P. Wadley et al., Nat. Commun. 4 2322 (2013)