Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 51: Spin Excitations/ Spin Torque

MA 51.7: Vortrag

Freitag, 30. März 2012, 11:00–11:15, H 1012

Magnon Excitations in Epitaxial Fe Films on Ir(001) — •Tzu-Hung Chuang, Yu Zhang, Huajun Qin, Khalil Zakeri, and Jürgen Kirschner — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany

Fe(001) films with a thickness of up to 10 monolayers (ML) grow pseudomorphically on Ir(001) with a constant in-plane film strain [1]. The room temperature ferromagnetic hysteresis loop is observed only above 5 ML. The Fe films with a thickness of 6 ML show a very small magnetic anisotropy. Here we report the experimental results of high wave-vector magnon excitations probed on a 6 ML Fe film by spin-polarized electron energy loss spectroscopy (SPEELS). The magnon dispersion relation is measured along the [100]- and [110]- directions of the Fe film. It is found that the magnon dispersion relation is anisotropic. The results cannot be explained by the classical Heisenberg spin Hamiltonian taking only the isotropic Heisenberg exchange interaction into account.

[1] V. Martin, W. Meyer, C. Giovanardi, L. Hammer, K. Heinz, Z. Tian, D. Sander, and J. Kirschner, Phys. Rev. B 76, 205418 (2007).