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Dresden 2020 – scientific programme

The DPG Spring Meeting in Dresden had to be cancelled! Read more ...

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O: Fachverband Oberflächenphysik

O 118: Surface Magnetism II (joint session O/MA)

O 118.6: Talk

Friday, March 20, 2020, 11:45–12:00, GER 38

Bloch-type spin helix in bilayer Fe islands on Ir(110) by spin polarized STMJeison A. Fischer1, •Timo Knispel1, Mahasweta Bagchi1, Jens Brede1, Vasily Tseplyaev2, Markus Hoffmann2, Stefan Blügel2, and Thomas Michely11II. Physikalisches Institut, Universität zu Köln, 50937 Cologne, Germany — 2Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich, 52425 Jülich, Germany

Most work on interfacial chiral spin textures focused on films exhibiting C3v symmetry and isotropic Dzyaloshinskii-Moriya interaction (DMI), known to only support Néel-type spin helices and skyrmions [1]. In contrast, C2v symmetry systems such as the (110) surface of an fcc crystal, are predicted to show anisotropic DMI leading to various scenarios of topological pattern formation [2]. Fully unexpectedly, our spin-polarized STM/STS study reveals a magnetic stripe phase, due to a spin helix with a period of 1.2 nm along the [-1 1 0] direction in bilayer Fe islands on unreconstructed Ir(110). Based on detailed field dependent measurements with a vector magnet, we conclude that the chirality of the spin helix is of Bloch-type, where the rotation is perpendicular with the propagation direction. This contradicts the assumption of the spin helix being induced by an interface in-plane DMI vector. Combined with theoretical insights, we discuss our findings in terms of the formation energy in systems with C2v symmetry. Funding: CRC1238 and the Jülich Supercomputing Center project CJIAS1F

[1] S. Heinze et al. Nat. Phys. Vol.7, p.713 (2011).

[2] M. Hoffmann et al. Nat. Commun. Vol.8, p.308 (2017).

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