Dresden 2017 – scientific programme
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MA: Fachverband Magnetismus
MA 34: Spin Dynamics and Transport: Magnonics
MA 34.3: Talk
Wednesday, March 22, 2017, 10:00–10:15, HSZ 04
Spin-Wave Mode Conversion via Optically Induced Landscapes of the Saturation Magnetization — •Marc Vogel1, Rick Aßmann1, Andrii V. Chumak1, Burkard Hillebrands1, and Georg von Freymann1,2 — 1Department of Physics and State Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger-Str. 56, 67663 Kaiserslautern, Germany — 2Fraunhofer-Institute for Physical Measurement Techniques IPM, Fraunhofer-Platz 1, 67663 Kaiserslautern, Germany
Magnons - eigen excitations of the electrons’ spin system - are seen as a potential candidate for future data processing. For this, in-plane magnetized samples are the first choice because they do not require a large biasing field. However, due to a strong spin-wave anisotropy the backward volume magnetostatic spin waves (BVMSW) propagating along the biasing field and the magnetostatic surface spin waves (MSSW), propagating perpendicularly, exist in different frequency ranges.
Here, we use our recently reported technique of laser modified magnetic media [Nature Physics 11, 487 (2015)] to realize a highly efficient method to convert BVMSW to MSSW. Computer generated holograms are used to heat up the sample locally (due to the optical absorption). A temperature gradient evolves inside the waveguide resulting in a shift of the dispersion relations to lower frequencies. Thus, MSSW- and BVMSW-bands are formed. Both intersect with each other leading to the BVMSW-MSSW-mode conversion.
Financial support by DFG collaborative research center SFB/TTR 173 "Spin+X" (project B04) is gratefully acknowledged.