Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 16: Magnetic Excitations: from surfaces down to adatoms (jointly with MA)

O 16.3: Topical Talk

Monday, March 11, 2013, 16:00–16:30, H23

Magnetic excitations in all metallic nanostructures — •Wulf Wulfhekel — Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany

The spins in magnetic nanostructures can be excited, when passing an electric current through them. In the inelastic scattering events, the spin of a hot electron of the current provided by a scanning tunneling microscope may be flipped and angular momentum is transferred to the magnetic system [1]. We used this technique to determine magnon dispersions and life times in thin itinerant magnetic films [2] and to determine the magnetic anisotropy and exchange coupling in atomically assembled magnetic clusters [3]. Finally, we show that the technique is capable to detect spin flips also in rare earth clusters and that the anisotropy as well as the life times of the states in the 4f-systems require a fully relativistic treatment [4].

[1] T. Balashov et al., Phys. Rev. Lett. 97, 187201 (2006), Phys. Rev. B 78, 174404 (2008). [2] C.L. Gao et al., Phys. Rev. Lett. 101, 167201 (2008). [3] T. Balashov et al., Phys. Rev. Lett 102, 257203 (2009). [4] T. Schuh et al., Phys. Rev. B 84, 104401 (2011), Nano Lett. 12, 4805 (2012).