Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 35: Poster 2
MA 35.36: Poster
Thursday, September 8, 2022, 16:00–18:00, P4
Spin pumping in embedded lateral nanostructures in Fe60Al40 — Tanja Strusch1, Ralf Meckenstock1, Rantej Bali2, Jonathan Ehrler2, Kay Potzger2, Kilian Lenz2, Jürgen Lindner2, Michael Farle1, and •Anna Semisalova1 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen, Duisburg, Germany — 2Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Dresden, Germany
The magnetic properties of an Fe60Al40 (FeAl) alloy are tailorable from paramagnetic (PM) to ferromagnetic (FM) state by variation of the structure through ion beam irradiation, making it a promising material for the fabrication of magnetic landscapes and magnonic crystals. Here, we report on ferromagnetic resonance (FMR) detected spin pumping in FeAl/Pd and Py/FeAl bilayers and laterally patterned nanostructures and show that FeAl can be used as spin source and as spin sink. Using FMR, we estimate the spin pumping efficiency and find a spin-mixing conductance of g_FeAl=2.1(+/-0.2) nm^(-2) and a spin diffusion length of λ_FeAl=11.9(+/-0.2) nm for paramagnetic FeAl, and g_Pd=3.8(+/-0.5) nm^(-2) and λ_Pd=9.1(+/-2.0) nm for Pd. Further, we investigate the spin pumping in laterally patterned FeAl nanostructures representing 500 nm wide FM strips separated by PM strips of different width (100-400 nm) produced in a 40 nm thick FeAl film. We find an enhancement of the damping parameter with decreasing width of the PM FeAl areas due to an increase of the number of FM/PM interfaces. Financial support from DFG is gratefully acknowledged (project No. 392402498 (SE 2852/1-1 | AL 618/37-1)).