Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.7: Poster

Dienstag, 13. März 2018, 09:30–13:00, Poster A

Spin textures in Fe/Rh/Ir(111) investigated by spin-polarized STM — •Andre Kubetzka, Kirsten von Bergmann, and Roland Wiesendanger — Department of Physics, University of Hamburg, Germany

We employ low temperature spin-polarized STM to investigate heterogeneous bilayer films on the heavy substrate Ir(111). While Pd/Fe/Ir(111) shows a magnetic spin spiral of  6 nm, which forms a skyrmion lattice in an applied field of 1.5 Tesla [1], exchanging Pd with Rh results in spiral periods of only 1-1.5 nm in Rh/Fe/Ir(111) [2]. Here, we investigate the magnetism of the reversed system, Fe/Rh/Ir(111), where the Fe layer is moved away from the heavy substrate. Depending on the stacking of the Fe layer (hcp or fcc), we find a spiral of period 1.1 nm and a hexagonal spin texture with a period of 1.3 nm. The magnetic periods are surprisingly close to the reversed system, Rh/Fe/Ir(111), but interestingly, the stacking of the Fe layer alone determines whether the spin texture is one- or two-dimensional.

[1] N. Romming et. al, Writing and deleting single magnetic skyrmions, Science 341, 636 (2013).

[2] N. Romming et. al, Spin spirals in ultra-thin films driven by frustration of exchange interactions: Rh/Fe/Ir(111), arXiv:1610.07853 (2016).