Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Organic films and electronics, photoorganics; Nanostructures; Plasmonics and nanooptics, Surface chemical reactions and heterogeneous catalysis, Surface dynamics )

O 36.83: Poster

Dienstag, 12. März 2013, 18:15–21:45, Poster B2

Nanomagnets affected by spin-polarized tunneling and field-emission — •Johannes Friedlein, Anika Schlenhoff, Stefan Krause, Andreas Sonntag, and Roland Wiesendanger — Institute of Applied Physics, University of Hamburg

Understanding the interaction of spin-polarized electrons with magnetic solids is a key aspect in advanced spin-electronic applications.
In general, a spin-polarized current affects a nanomagnet by Joule heating and magnon generation. In order to investigate similarities and differences of the interaction of tunneling and field-emitted electrons with magnetic matter on the atomic scale, we performed a combined spin-polarized tunneling microscopy (SP-STM) and spin-polarized scanning field-emission microscopy (SP-SFEM) study [1,2]. From a detailed lifetime analysis of a thermally switching nanomagnet, we extract the impact of spin-polarized tunneling and field-emitted electrons on Joule heating and spin-transfer torque. Whereas tunneling electrons carry low-energy into the magnet, high-energy field-emitted electrons are injected into the spin-dependent image potential states located in the vacuum in front of the magnet and subsequently relax into the sample [3]. We will present the experimental results in terms of current-dependent generation of Joule heating, magnons and Stoner excitations.
S. Krause et al., Phys. Rev. Lett. 107, 186601 (2011).
A. Schlenhoff et al., Phys. Rev. Lett. 109, 097602 (2012).
A. Kubetzka et al., Appl. Phys. Lett. 91, 012508 (2007).