Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 22: Surface Magnetism (Joint Session with O)

MA 22.4: Vortrag

Dienstag, 21. März 2017, 10:45–11:00, HSZ 401

Tuning DMI in antiferromagnetic Fe/Ir interfaces — •Sebastian Meyer, Bertrand Dupé, Paolo Ferriani, and Stefan Heinze — Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel, Leibnizstr. 15, 24098 Kiel

Recently, magnetic skyrmions could be stabilized in ultrathin films at surfaces due to the interfacial Dzyaloshinskii-Moriya interaction (DMI) [1,2]. Their intriguing topological and dynamical properties make them interesting for future spintronic applications [3]. It has been predicted that skyrmions in antiferromagnets posses favorable transport properties compared to those in ferromagnets [4]. Here, we present a way to tune the DMI in antiferromagnetic Fe/Ir interfaces. We study Fe/Ir bilayers on Rh(001) using density functional theory as implemented in the FLEUR code (www.flapw.de). For both stackings of the bilayer, i.e. Fe/Ir/Rh(001) and Ir/Fe/Rh(001), the nearest-neighbor (NN) exchange is antiferromagnetic. Fe/Ir/Rh(001) has magnetic properties similar to Fe/Ir(001) [5] and for Ir/Fe/Rh(001), we find very large values of the DMI. Due to exchange frustration, the DMI even exceeds the NN exchange in absolute value. By adding a second Ir overlayer, the DMI is reduced by 60% emphasizing the impact of the Fe/Ir interface on the DMI.

[1] S. Heinze et al., Nature Phys. 7, 713 (2011).

[2] N. Romming et al., Science 341, 636 (2013).

[3] A. Fert et al., Nature Nano, 8, 3 (2013).

[4] J. Barker et al., Phys. Rev. Lett. 116, 147203 (2016).

[5] M. Hoffmann et al., Phys. Rev. B 92, 020401 (2015).