SKM 2021 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Posters Magnetism IV
MA 15.25: Poster
Donnerstag, 30. September 2021, 13:30–16:30, P
Large exchange coupling of Mn2Au/Ni81Fe19 for antiferromagnetic spintronics — •S. P. Bommanaboyena1, D. Backes2, L. Ishibe Veiga2, S. S. Dhesi2, Y. R. Niu3, B. Sarpi3, T. Denneulin4, A. Kovacs4, T. Mashoff1, O. Gomonoy1, J. Sinova1, K. Everschor-Sitte1, D. Schönke1, R. M. Reeve1, M. Kläui1, H.-J. Elmers1, and M. Jourdan1 — 1Institut für Physik, Johannes Gutenberg-Universität, Staudingerweg 7, D-55099 Mainz, Germany — 2Diamond Light Source, Chilton, Didcot, Oxfordshire, OX11 0DE, United Kingdom — 3MAX IV Laboratory, Fotongatan 8, 22484 Lund, Sweden — 4Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, FZ Jülich, D-52425 Jülich, Germany
Mn2Au is a prominent antiferromagnet (AFM) which possesses the requisite crystallographic symmetry to exhibit a current induced Néel spin-orbit torque [1]. We demonstrate an exceptionally strong exchange coupling of Mn2Au films with very thin Permalloy (Py) overlayers [2]. The AFM Mn2Au domain pattern is perfectly imprinted on the Py, which is attributed to a specific atomic termination of the Mn2Au(001) thin film. Ferromagnetic hysteresis loops of exchange coupled 2nm Py overlayers reveal a large coercive field of 0.5 T. This is associated with a coupled rotation of both the Py magnetization and the Néel order of the underlying Mn2Au. Our results unlock novel possibilities for the readout of next generation antiferromagnetic spintronics devices. [1] S. Yu. Bodnar et al, Nat. Commun. 9, 348 (2018). [2] S.P. Bommanaboyena et al, arXiv:2106.02333 (2021).