Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 16: Poster I

MA 16.21: Poster

Dienstag, 12. März 2013, 10:30–13:30, Poster D

A theoretical analysis of the spin dynamics of magnetic adatoms traced by pump-probe scanning tunneling spectroscopy — •Michael Schüler, Yaroslav Pavlyukh, and Jamal Berakdar — Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Heinrich-Damerow-Straße 4, 06120 Halle

The inelastic tunneling spectroscopy (IETS) provides a very suitable tool for the detailed analysis of the magnetic properties of adatoms and molecules. Furthermore, the inelastic scanning tunneling microscopy (STM) using a spin-polarized tip also allows for manipulating the spin configuration and for tracing the nanosecond spin dynamics of the magnetic adsorbates in a pump-probe manner. Based on a non-perbutative model, we theoretically investigate the excitation mechanism of the sample spin, its dependence on the anisotropic environmentand demonstrate how the relaxation dynamics can be monitored with the help of the tunnelling current. The predictions of a simple analytical model support our numerical findings and reveal the underlying physics. We also compare our results to recent experiments.