Berlin 2018 – scientific programme

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.3: Poster

Tuesday, March 13, 2018, 09:30–13:00, Poster A

Spin-resolved inelastic electron scattering by spin-waves in non-collinear magnets — •Flaviano José dos Santos, Manuel dos Santos Dias, Filipe S.M. Guimarães, Juba Bouaziz, and Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, D-52425 Jülich, Germany

So far, no experimental technique has attempted to probe large wave-vector spin-waves in non-collinear low-dimensional systems. In this work, we explain how inelastic electron scattering, being suitable for investigations of surfaces and thin films, can detect the collective spin-excitation spectra of non-collinear magnets. We propose a measurement protocol to reveal the particularities of spin-waves in such non-collinear samples, by utilizing spin-polarized electron-energy-loss spectroscopy augmented with a spin-analyzer. With the spin-analyzer detecting the polarization of the scattered electrons, four spin-dependent scattering channels are defined, which allow to filter and select specific spin-wave modes. We take as examples a topological non-trivial skyrmion lattice, a spin-spiral phase and the conventional ferromagnet. Then we demonstrate that, counter-intuitively and in contrast to the ferromagnetic case, even non spin-flip processes can generate spin-waves in non-collinear substrates.

Work supported by the Brazilian agency CAPES under Project No. 13703/13-7 and the European Research Council under ERC-consolidator Grant No. 681405-DYNASORE.