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MA: Fachverband Magnetismus
MA 46: Magnetic Thin Films I
MA 46.7: Talk
Thursday, March 19, 2015, 16:45–17:00, H 1012
Evidenceof Antiferromagnetic Exchange Interaction in Fe Films on Rh(001) — •Yang Meng1, Khalil Zakeri Lori1, Arthur Ernst1,2, Tzu-Hung Chuang1, Huajun Qin1, Ying-Jiun Chen1, and Jürgen Kirschner1,3 — 1Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany — 2Wilhelm Ostwald Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstr. 2, 04103 Leipzig, Germany — 3Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle, Germany
Magnetic properties and high-energy magnon excitations in ultrathin Fe films on Rh(001) are studied by means of magneto-optical Kerr effect and spin polarized high resolution electron energy loss spectroscopy, respectively. The magnon dispersion relation is probed over a large region of the surface Brillouin zone. A strong magnon softening is observed at the high symmetry M–point, indicating a large antiferromagnetic (AFM) exchange interaction in the films. First-principles calculations showed that this unusual AFM exchange interaction has its origin not only in the strong interfacial electronic hybridizations between the Fe film and the Rh substrate but also in the tetragonal distortion of the film, caused by the film epitaxy. Our results shed light on the long standing question regarding the possibility of having an AFM exchange interaction in Fe films.