Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 34: Spintronics (joint session MA/TT)

MA 34.2: Vortrag

Mittwoch, 14. März 2018, 15:15–15:30, EB 202

Current induced Nèel vector manipulation in Mn₂Au and associated giant anisotropic magnetoresistance — •Bodnar Stanislav¹, Šmejkal Libor^1,2,3, Gomonay Olena¹, Sinova Jairo¹, Sapozhnik Alexey¹, Elmers Hans-Joachim¹, Kläui Mathias¹, Filianina Mariia¹, and Jourdan Martin¹ — ¹Mainz University, Staudinger Weg 7, 55128 Mainz, Germany — ²Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnicka 10, 162 00 Praha 6, Czech Republic — ³Faculty of Mathematics and Physics, Charles University, Department of Condensed Matter Physics, Ke Karlovu 5, 12116 Praha 2, Czech Republic

Antiferromagnetic materials could be used as active elements in spintronics. This requires the ability to switch and read-out the Néel vector state. In our work we demonstrate for Mn₂Au, a good conductor with a high ordering temperature suitable for applications, reproducible switching of the Nèel vector using current pulse generated bulk spin-orbit torques and read-out by magnetoresistance measurements. Reversible and consistent changes of the longitudinal resistance and planar Hall voltage of star-patterned epitaxial Mn₂Au(001) thin films were generated by pulse current densities of 10⁷ A/cm² . The symmetry of the torques agrees with theoretical predictions and a large read-out magnetoresistance effect of more than 6 % is reproduced by ab initio transport calculations.