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MA: Fachverband Magnetismus

MA 22: Surface Magnetism (Joint Session with O)

MA 22.5: Vortrag

Dienstag, 21. März 2017, 11:00–11:15, HSZ 401

Probing short and long range magnetic interactions on the nanoskyrmion system Fe/Ir(111) with force spectroscopy — •Alexander Schwarz, Josef Grenz, and Roland Wiesendanger — Universität Hamburg, Institut für Nanostruktur- und Festkörperphysik, Jungiusstr. 11, 20355 Hamburg

With a lattice constant of just 1 nm the Fe monolayer on Ir(111) exhibits the smallest skyrmion lattice observed so far [1]. Utilizing magnetic exchange force microscopy (MExFM) [2] we are able to simultaneously resolve the atomic and magnetic structure. Unlike on antiferromagnetic surfaces studied previously with MExFM [2,3], the long range dipolar magnetic force does not cancel out completely above the surface.

To investigate the interplay between chemical, magnetic exchange and magnetic dipolar interactions, we recorded site specific force spectroscopy data. We find that the magnetic lattice can be detected before atomic resolution is achieved, indicating that long-range magnetic dipolar forces contribute significantly to the magnetic signal. This finding suggests that magnetic force microscopy (MFM) imaging of such a nanoskyrmion lattice is feasible. Since MFM is performed at larger tip sample separations than required for MExFM the magnetic structure is less perturbed by the presence of a magnetic tip.

[1] S. Heinze et al., Nature Physics 7, 713 (2011).

[2] U. Kaiser et al., Nature 446, 522 (2007).

[3] R. Schmidt et al., Nano Lett. 9, 200 (2009).