Berlin 2024 – scientific programme

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DS: Fachverband Dünne Schichten

DS 14: Transport Properties

DS 14.2: Talk

Thursday, March 21, 2024, 09:45–10:00, A 060

Magneto-transport characterization of ultra-thin corrugated Cr2O3/Co/Pt layers — •Shahrukh Shakeel, Oleksandr Pylypovskyi, Pavlo Makushko, Denise Erb, Shengqiang Zhou, René Hübner, Jose Angel Fernandez Roldan, Olha Bezsmertna, Jürgen Faßbender, Oleksii Volkov, and Denys Makarov — Helmholtz-Zentrum Dresden-Rossendorf e. V., Dresden, Germany

Chiral magnetic textures are formed in low-dimensional ultra-thin magnetic systems due to the presence of intrinsic Dzyaloshinskii-Moriya interaction (iDMI), appearing due to the breaking or lack of inversion symmetry at the film interfaces [1]. Alternatively, in curvilinear magnetic systems, exchange-induced or extrinsic DMI (eDMI) emerges due to the geometrical breaking of local inversion symmetry [1]. The synergy between iDMI and eDMI, resulting into a mesoscale value of DMI (mDMI), enables the tunability of magnetochirality by selecting application specific material and geometry [1]. We studied this interplay by magneto-transport measurements of ultra-thin corrugated Cr2O3/Co/Pt layers with perpendicular magnetic anisotropy to calculate the effective spin-orbit torque (SOT) fields [4] and subsequently the mDMI strength for flat (reference) and corrugated samples. Whereby, a change in mDMI strength is observed due to the corrugations. Furthermore, the angular dependence of mDMI with respect to the angle between the crosses and corrugations was explored. References [1] O. Volkov et al., Sci. Rep. 8, 866 (2018). [2] J. Kim et al., Nat. Mat. 12, 240-5 (2012).

Keywords: Magneto-transport; Ultra-thin films; Dzyaloshinskii-Moriya Interaction (DMI); Curvilinear magnetism