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MA: Fachverband Magnetismus

MA 45: Magnetic Relaxation and Gilbert Damping

MA 45.4: Vortrag

Donnerstag, 12. März 2026, 10:15–10:30, POT/0351

Temperature dependence of volume and interface contributions to the magnetic damping of Permalloy thin films — Verena Ney¹, Kilian Lenz², Fabian Ganss², René Hübner², Jürgen Lindner², and •Andreas Ney¹ — ¹Johannes Kepler Universität, Linz, Österreich — ²Helmholtz-Zentrum Dresden-Rossendorf, Deutschland

The magnetic damping of Ni₈₀Fe₂₀ (Permalloy, Py) thin films has been reported to be lowest when sandwiched in Al cap and spacer layers [1]. Here we study the Gilbert damping parameter α as a function of Py layer thickness via temperature- and frequency-dependent ferromagnetic resonance (FMR) experiments. The full FMR dataset allows to separate the Gilbert-like contributions to the FMR linewidth from non-Gilbert-like ones like two magnon scattering processes. In addition, the Py thickness series allows to deconvolute α into its respective bulk and interfacial contributions and their respective temperature dependencies. While the bulk contribution monotonously decreases with temperature from 0.0061(1) down to 0.0054(1), the interfacial contribution shows a subsequent increase at low temperature. The remaining bulk contribution, which is only of resistivity-like character, can be considered to reflect the intrinsic magnetic damping properties of Py thin films, while the interface contribution contains both resistivity- and conductivity-like contributions [2].

[1] V. Ney et al. Phys. Rev. Materials 8, 124410 (2024)

[2] V. Ney et al. Phys. Rev. Materials (submitted, 2025)

Keywords: Ferromagnetic resonance; Gilbert damping; Permalloy; bulk and interface contribution