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O: Fachverband Oberflächenphysik

O 110: Poster Session VIII: Poster to Mini-Symposium: Dzyaloshinskii-Moriya Interaction (DMI) in magnetic layered systems

O 110.3: Poster

Thursday, March 4, 2021, 13:30–15:30, P

First-principles study of exchange frustration and DMI in Rh/Co/Fe/Ir multilayers — •Felix Nickel, Sebastian Meyer, and Stefan Heinze — Institute of Theoretical Physics and Astrophysics, University of Kiel

Magnetic skyrmions are promising for data storage, logic devices, and neuromorphic computing. Materials, which can host nanoscale skyrmions in zero magnetic field at room temperature, are desirable for such applications. Recently, it has been shown that ultrathin Rh/Co films on Ir(111) exhibit skyrmions with diameters below 10   nm at zero magnetic field [1]. In magnetic multilayers, room temperature skyrmion with diameters of 30   nm - 90   nm have been reported [2]. The Dzyaloshinskii-Moriya interaction (DMI), the exchange interaction, and the magnetocrystalline anisotropy are the main characteristics that make materials capable of hosting such complex spin structures. Here, we present density functional theory calculations for transition-metal multilayers consisting of Co, Fe, Ir, and Rh layers. We varied the thickness and material for the magnetic layer (Co and Fe) and the spacer layer (Ir and Rh), as well as the stacking of the individual layers. We present how the magnetic interactions depend on those structural conditions. We demonstrate that it is possible to transfer the properties of the ultrathin film system Rh/Co/Ir(111) [1] to a multilayer system.
[1] Meyer et al., Nat. Commun. 10, 3823 (2019)
[2] Moreau-Luchaire et al., Nat. Nanotechnol. 11, 444 (2016)