Dresden 2020 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 7: Micro- and Nanostructured Materials (joint session MA/TT)
TT 7.3: Talk
Monday, March 16, 2020, 10:00–10:15, HSZ 403
Experimentally observable curvature-induced effects in parabolic nanostripes — •Oleksii M. Volkov1, Attila Kákay1, Florian Kronast2, Ingolf Mönch1, Mohamad-Assaad Mawass2, Jürgen Fassbender1, and Denys Makarov1 — 1Helmholtz-Zentrum-Dresden-Rossendorf, Dresden, Germany — 2Helmholtz-Zentrum Berlin für Materialen und Energie, Berlin, Germany
Dzyaloshinskii-Moriya interaction (DMI) is a key aspect in magnetism that can lead to the appearance of chiral effects, such as the topological Hall effect [1], or to the formation of chiral noncollinear magnetic textures, as skyrmions or chiral domain walls [1]. Curvature effects in magnetism offer means to create chiral interactions like DMI based on the geometry of thin films [2]. This extrinsic tailoring of the DMI (strength and spatial orientation) is in stark contrast to conventional approaches, where chiral interactions are tuned relying on extensive material screening. Very recently, we provide the very first experimental confirmation of the existence of curvature-induced DMI in parabola-shaped Permalloy nanostripes [3,4]. The magnitude of the effect can be tuned by the parabola’s curvature and width, while its value is comparable with those experimentally reported for asymmetric Co sandwiches.
[1] N. Nagaosa and Y. Tokura, Nat. Nanotechnol. 8, 899 (2013).
[2] Y. Gaididei et al., PRL 112, 257203 (2014).
[3] O. Volkov et al., PRL 123, 077201 (2019).
[4] O. Volkov et al., PSS-RRL 13, 1800309 (2019).