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TT: Fachverband Tiefe Temperaturen
TT 88: Spin Transport and Orbitronics, Spin-Hall Effects II (joint session MA/TT)
TT 88.1: Vortrag
Donnerstag, 12. März 2026, 15:00–15:15, POT/0361
Spin-pumping and induced magnetic polarization in permalloy/platinum heterostructures — •Verena Ney1, Kilian Lenz2, Fabrice Wilhelm3, René Hübner2, Fabian Ganss2, Andrei Rogalev3, Jürgen Lindner2, and Andreas Ney1 — 1Johannes Kepler Universität Linz, Österreich — 2Helmholtz Zentrum Dresden-Rossendorf, Deutschland — 3ESRF, Grenoble, Frankreich
Spin pumping is the transfer of angular momentum across interfaces into a non-ferromagnetic material driven by the precessing magnetization of an adjacent ferromagnet. Using ferromagnetic resonance (FMR) the presence of spin pumping can be evidenced by an increase of the Gilbert damping parameter α [1]. Here we study platinum-permalloy (Pt/Py) heterostructures using temperature-dependent broadband FMR. A clear increase of α is seen in a temperature range from 10 to 300 K when Pt and Py are in direct contact. The temperature dependence of the spin-pumping contribution can be derived by comparing with an Al-sandwiched Py reference film from [2]. Surprisingly, upon insertion of a thin Al spacer layer between Pt and Py the increase in α is suppressed. X-ray magnetic circular dichroism at the Pt L3-edge reveals a clear magnetic polarization in Pt/Py whereas it is absent when a spacer layer of only 2 nm of Al is inserted. The induced polarization of Pt can thus be associated with spin pumping, while non-polarized Pt in proximity to Py shows an almost identical α(T) behavior as the Py reference sample in [2].
[1] Y. Tserkovnyak Phys. Rev. Lett. 88, 117601 (2002)
[2] V. Ney et al. Phys. Rev. Materials 7, 124403 (2023)
Keywords: spin pumping; Permalloy; platinum; ferromagnetic resonance; x-ray magnetic circular dichroism