Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 45: Focus Session: Magnon Transport in Metallic Spin Textures

MA 45.2: Hauptvortrag

Mittwoch, 22. März 2017, 16:15–16:45, HSZ 04

Spin wave caustics and channelling in chiral spin systems — •Joo-Von Kim — Centre for Nanoscience and Nanotechnology (C2N), CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91405 Orsay, France

Spin waves are elementary excitations in magnetic systems and have attracted renewed attention due to possible applications in information processing. In ultrathin films and nanostructures, the presence of chiral interactions of the Dzyaloshinskii-Moriya form can lead to a number of interesting phenomena such as nonreciprocal propagation and channelling. We will present some recent theoretical work in this area, namely the appearance of caustics and interference patterns generated by a point source in continuous films [1], nonreciprocal channelling along chiral domain walls [2], and edge channelling states in nanostructured media [3]. These results may benefit future device development by illustrating how unidirectional flow of spin wave power can be achieved in realistic material systems.

This work was partially supported by the Agence Nationale de la Recherche (France) under contract numbers ANR-14-CE26-0012 (Ultrasky) and ANR-16-CE24-0027 (Swangate).

[1] J.-V. Kim et al., Phys. Rev. Lett. 117, 197204 (2016).

[2] F. Garcia-Sanchez et al., Phys. Rev. Lett. 114, 247206 (2015).

[3] F. Garcia-Sanchez et al., Phys. Rev. B 89, 224408 (2014).