Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: POSTER Ib
MA 20.36: Poster
Dienstag, 17. März 2015, 09:30–13:00, Poster A
Spin-curvature and local density of states in PdFe/Ir(111) — Christian Hanneken1, •André Kubetzka1, Niklas Romming1, Kirsten von Bergmann1, Roland Wiesendanger1, Fabian Otte2, Bertrand Dupé2, and Stefan Heinze2 — 1Department of Physics, University of Hamburg — 2Institute of Theoretical Physics and Astrophysics, University of Kiel
In many magnetic systems the spin-averaged local density of states (LDOS) depends on the magnetization direction due to spin-orbit interaction. This effect can be measured e.g. with scanning tunneling spectroscopy and is typically on the order of 10% [1].
Here we employ the same technique to investigate the influence of the magnetic non-collinearity (spin-curvature) in a PdFe bilayer on Ir(111) [2,3] onto the LDOS measured in the vaccum above the surface. The effect is surprisingly strong and can be tuned by changing the spin-curvature of a skyrmion in applied magnetic fields. Tight-binding calculations show that it stems from the mixing between majority and minority spin bands which scales with the local spin-curvature.
[1] M. Bode et al., Phys. Rev. Lett. 89, 237205 (2002).
[2] N. Romming et al., Science 341, 636 (2013).
[3] B. Dupé et al., Nature Commun. 5, 4030 (2014).