Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 67: Competition for the Gerhard Ertl Young Investigator Award

O 67.1: Vortrag

Donnerstag, 14. März 2013, 10:30–11:00, H45

Magnon Rashba effect at ferromagnetic surfaces — •Khalil Zakeri Lori — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany

Rashba effect refers to as a spin–splitting phenomenon of the electronic band structure in the absence of any external magnetic field. It originates from a fundamental effect known as spin–orbit coupling. Basically, the relativistic motion of electrons produces a magnetic field, which couples to their spins and causes a splitting in the energy levels of electrons with different spins. It offers a way to control and manipulate the electrons spin and thus lies in the central idea of spintronics. We report a similar effect on the spin integer quasi-particles i.e. magnons at a ferromagnetic surface. We provide the first direct experimental evidence, which demonstrates that the dispersion relation of surface magnons in the presence of spin–orbit coupling and in the absence of time-reversal symmetry shows a splitting for different magnetization directions, similar to the electron dispersion relation at metal surfaces [1]. Moreover, we will show that the lifetime, amplitude, group and phase velocity of surface magnons propagating along two opposite (but equivalent) directions perpendicular to the magnetization are different [2]. Our findings can inspire ideas for designing new spintronic devices based on this new effect. [1] Zakeri et al., Phys. Rev. Lett. 104, 137203 (2010). [2] Zakeri et al., Phys. Rev. Lett. 108, 197205 (2012).