Step-Edge-Induced Anisotropic Chiral Spin Coupling in Ultrathin Magnetic Films

Physical Review Letters
A SchlenhoffR Wiesendanger

Abstract

Step edges represent a local break of lateral symmetry in ultrathin magnetic films. In our experiments, we investigate the spin coupling across atomic step edges on Fe/W(110) by means of spin-polarized scanning tunneling microscopy and spectroscopy. Local modifications of the spin texture toward step edges separating double from single layer areas are observed, and selection rules indicate a chiral spin coupling that significantly changes with the propagation along the [11[over ¯]0] or the [001] crystallographic direction. The findings are explained via anisotropic Dzyaloshinskii-Moriya interactions arising from the broken lateral symmetry at atomic step edges.

References

Dec 1, 1996·Physical Review. B, Condensed Matter·H J ElmersU Gradmann
Oct 3, 2001·Physical Review Letters·M PratzerR Wiesendanger
Feb 28, 2002·Physical Review Letters·A KubetzkaR Wiesendanger
Aug 10, 2013·Science·Niklas RommingRoland Wiesendanger
Aug 23, 2017·Nature Communications·Markus HoffmannStefan Blügel

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