Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 42: Posters Magnetism I
MA 42.40: Poster
Wednesday, March 18, 2020, 15:00–18:00, P3
Current induced switching of the Néel vector in CoO(001)/Pt bilayers — •Christin Schmitt1, Lorenzo Baldrati1, Romain Lebrun1, Andrew Ross1,2, Rafael Ramos3, Eiji Saitoh3,4, and Mathias Kläui1,2 — 1Institute of Physics, Johannes Gutenberg-University Mainz, Germany — 2Graduate School of Excellence Materials Science in Mainz, Germany — 3WPI-AIMR, Tohoku University, Sendai, Japan — 4Department of Applied Physics, The University of Tokyo, Japan
Spintronics using antiferromagnets is promising based on intrinsic dynamics in the THz range and absence of stray fields. However efficient electrical writing and reading is necessary. This was shown in the insulating antiferromagnet NiO/heavy metal Pt thin film system (see for instance [1] and references therein), however a signal stemming from non-magnetic switching was also identified [2]. Here, we probe current-induced switching of the Néel vector in Hall crosses patterned on CoO(001)/Pt bilayers. We detect the Néel order by Spin Hall magnetoresistance (SMR) in a Hall-like geometry and switching is induced by current pulses via spin orbit torques. By looking at the switching above and below the Neél temperature in the CoO/Pt bilayer we can separate the ``step-like" magnetic [1] and ``triangular-like" non-magnetic switching signals [1,2], as the signal related to the antiferromagnetism disappears above Néel temperature. The non-magnetic signal, possibly related to a local annealing process and electromigration in the Pt layer, does not disappear. [1] L. Baldrati et al., PRL 123, 177201 (2019). [2] T. Matalla-Wagner et al., arxiv:1910.8576.