Dresden 2017 – scientific programme

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MA: Fachverband Magnetismus

MA 54: Spin Hall Effects and Skyrmions II

MA 54.8: Talk

Thursday, March 23, 2017, 17:00–17:15, HSZ 04

Theory of inelastic electron scattering by spin waves in non-collinear magnets — •Flaviano José Dos Santos, Manuel Dos Santos Dias, and Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, D-52428 Jülich, Germany

Electron Energy Loss Spectroscopy is an invaluable tool for probing the spin wave excitations of thin ferromagnetic films [1]. However, to our knowledge no EELS experiment has been attempted for antiferromagnetic or non-collinear magnetic systems. With the aim to characterize the spin wave excitations in novel magnetic phases of matter, we developed and implemented a quantum mechanical description of inelastic electron scattering for arbitrary magnetic structures, using information from first principles calculations. We discuss the role of the spin polarization of the incoming and outgoing electrons, and the contribution from the four possible scattering channels to the inelastic cross-section. We illustrate the formalism for three model systems: a ferromagnet with Dzyaloshinksii-Moriya interaction, its spin spiral counterpart, and a skyrmionic lattice. For the latter we also make use of first-principles calculations for the experimentally well-characterized Pd/Fe/Ir(111) bilayer [2,3].

This work is supported by the HGF-YIG Programme VH-NG-717 (Funsilab) and by the Brazilian funding agency CAPES.

References: [1] Ibach, H., Surf. Sci. 630, 301-310 (2014) [2] Romming, N., et al. Phys. Rev. Lett. 114, 177203 (2015) [3] Crum, D., et al. Nat. Commun. 6, 8541 (2015)