Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 46: Magnonics II

MA 46.9: Vortrag

Donnerstag, 15. März 2018, 17:15–17:30, H 0110

Spin-wave transport in hexagonal nanotubes — Michael Zimmermann¹, Jorge Otálora², Sebastian Wintz³, Elisabeth Josten⁴, Tobias Schneider⁴, Helmut Schultheiss⁴, Jürgen Lindner⁴, Christian Back¹, Jürgen Fassbender⁴, and •Attila Kákay⁴ — ¹Physics Department, University of Regensburg, 93040 Regensburg, Germany — ²Leibniz Institute for Solid State and Materials Research Dresden (IFW Dresden), Institute for Metallic Materials, 01069 Dresden, Germany — ³Paul Scherrer Institut, Villigen PSI, Switzerland — ⁴Helmholtz-Zentrum Dresden - Rossendorf, Institute of Ion Beam Physics and Materials Research, 01328 Dresden, Germany

Spin-wave propagation in ferromagnetic nanotubes is fundamentally different than in flat thin films as shown recently[1]. In particular, the dispersion relation is asymmetric regarding the sign of the wave vector. As a consequence, spin waves traveling in opposite directions have different wavelengths. This purely curvature induced effect originates from the dipole-dipole interaction. Such non-reciprocal spin-wave propagation[2] is known for flat thin films with interfacial Dzyalonshiinsky-Moriya interaction. In this work we investigate spin-wave transport in nanotubes with hexagonal cross section using micromagnetic simulations and Scanning Transmission X-ray Microscopy. In contrast to round tubes the hexagonal tubes provide more channels - reciprocal and non-reciprocal ones - for spin-wave transport. [1] J.A. Otálora, et. al., Phys. Rev. Lett. 117, 227203 (2016). [2] K. Zakeri, et. al., Phys. Rev. Lett. 104, 137203 (2010).