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MA: Fachverband Magnetismus

MA 22: Surface Magnetism (Joint Session with O)

MA 22.3: Vortrag

Dienstag, 21. März 2017, 10:30–10:45, HSZ 401

Repulsive Skyrmion Interaction observed in Pd/Fe-Nanoislands on Ir(111) — •Philipp Lindner, Johannes Friedlein, Jonas Harm, Stefan Krause, and Roland Wiesendanger — Department of Physics, University of Hamburg, Jungiusstraße 11A, 20355 Hamburg, Germany

Recently, the realization of a room temperature skyrmionic racetrack-style memory device was reported [1], opening the path to ultradense data storage and high speed processing applications with magnetic skyrmions as information carriers.

Using spin-polarized scanning tunneling microscopy, controlled writing and deleting of single atomic-scale magnetic skyrmions was demonstrated via local injection of spin-polarized tunnel electrons in the Pd/Fe/Ir(111) system [2]. To design and construct novel spintronic devices, one has to understand and tailor the interaction of skyrmions in close vicinity to each other.

For our study we epitaxially grew Pd nanoislands on the Fe-monolayer on top of Ir(111). For a perpendicular magnetic field above 2 T, an isolated skyrmion phase is observed. We report experimental evidence of a repulsive short range interaction between individual skyrmions, supported by complementary time-resolved and static scanning tunneling microscopy studies. The experimental findings are discussed in terms of displacement, structural changes and lowered stability of the affected skyrmions.

[1] S. Woo et al., Nature Materials 15, 501 (2016).

[2] N. Romming et al., Science 341, 713 (2013).