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MA: Fachverband Magnetismus

MA 16: Poster I

MA 16.17: Poster

Dienstag, 12. März 2013, 10:30–13:30, Poster D

Magnetic Order and Magnon Dispersion Relation in Ultrathin Fe and FePd Alloy Films Grown on Pd(100) — •Huajun Qin, Tzu-Hung Chuang, Yu Zhang, Khalil Zakeri Lori, and Jürgen Kirschner — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany

Ultrathin Fe films with thicknesses of one and two atomic layers were grown on Pd(100) substrate at room temperature. Spin-polarized electron energy loss spectroscopy (SPEELS) has been utilized to measure the magnon dispersion relation. The results are compared to the ones of a chemically disordered FePd alloy film, with a thickness of two atomic layers, prepared by mild annealing of an Fe monolayer on Pd(100) surface at the temperature of 400 K [1]. All SPEELS measurements are performed at T=13 K. It is found that the magnon energies in the 2 ML FePd alloy film are considerably higher than the ones in the Fe monolayer, but are comparable to the ones in the 2 ML Fe film. This observation may be attributed to the enhanced Pd magnetic moment in the FePd alloy film and the role of interlayer exchange coupling. Our dynamic measurements predict that the alloy films shall have a higher Curie temperature than the Fe monolayer, in good agreement with our static measurements obtained by means of magneto-optical Kerr effect.

[1] H.L. Meyerheim, R. Popescu, and J. Kirschner, Phys. Rev. B 73, 245432 (2006).