Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 48: Poster Session II

MA 48.40: Poster

Donnerstag, 10. März 2016, 15:00–18:00, Poster B1

Time Resolved Scanning Tunnelling Spectroscopy on Magnetic Vortex Cores — Christian Saunus, •Marco Pratzer, Lukas Deutz, and Markus Morgenstern — II. Physikalisches Institut B, RWTH Aachen University and JARA-FIT, 52074 Aachen, Germany

A magnetic vortex is the simplest non-trivial magnetic order showing up in a magnetic disk with no magnetic anisotropy. The centre of this chiral magnetic structure features an out of plane magnetic moment called the vortex core. The vortex core can be driven to a resonant gyration by radio-frequency magnetic fields or spin polarized currents [1,2].
We performed spin polarized scanning tunnelling spectroscopy on Fe nano islands prepared on a W(110) crystal. The magnetic vortices are mapped using an anti-ferromagnetic tip made of bulk chromium. In order to excite the gyro mode we superimpose the bias voltage of the STM with a tunable high frequency voltage up to 3 GHz. We measure the resulting dc current as a function of frequency, which is interpreted in terms of the gyro mode.
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