Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 8: Spin Excitations and Spin Torque
MA 8.1: Vortrag
Montag, 11. März 2013, 09:30–09:45, H23
Impact of Atomic Structure on the Magnon Dispersion Relation: Fe(111)/Au/W(110) and Fe(110)/W(110) — •Tzu-Hung Chuang1, Khalil Zakeri1, Arthur Ernst1, Leonid M. Sandratskii1, Pawel Buczek1, Yu Zhang1, Huajun Qin1, Waheed Adeagbo2, Wolfram Hergert2, and Jürgen Kirschner1 — 1Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany — 2Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Von-Seckendorff-Platz 1, D-06120 Halle, Germany
We present a combined experimental and theoretical study of the correlation between the atomic structure and magnon energies in ultrathin Fe films. High wave-vector magnon excitations in a 2 monolayer (ML) Fe(111) film grown in an fcc-like stacking on 2ML Au/W(110) are probed by spin-polarized electron energy loss spectroscopy. The results are compared to the ones of a bcc-like film directly grown on W(110). It is found that the magnon energies in Fe(111)/Au/W(110) are lower than the ones in Fe(110)/W(110). Our calculations confirm the experimental results revealing a strong dependency of exchange interaction on the atomic structure. In the Fe/Au/W structure, it is observed that the intralayer exchange interactions increase with increasing distance between Fe atomic layers. This effect can be understood based on the complexity of the electronic structure and the contribution of different orbitals to the hybridization and exchange interaction [1].
[1] T.-H. Chuang, Kh. Zakeri, A. Ernst, L. M. Sandratskii, P. Buczek, Y. Zhang, H. J. Qin, W. Adeagbo, W. Hergert, and J. Kirschner, Phys. Rev. Lett. 109, 207201 (2012).