Simulation study of the Gilbert Damping in Ni80Fe20/Nd Bilayers: comparison with experiments.

CAO, LuLu, RUTA, Sergiu, KHAMTAWI, Rungtawan, CHUREEMART, Phanwadee, ZHAI, Ya, EVANS, Richard FL and CHANTRELL, Roy W (2024). Simulation study of the Gilbert Damping in Ni80Fe20/Nd Bilayers: comparison with experiments. Journal of physics. Condensed matter, 36 (30): 305901.

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We present an experimental and computational investigation the Neodymium thickness dependence of the effective damping constant (α_eff) in Ni80Fe20/Neodymium (Py/Nd) bilayers. The computational results show that the magnetic damping is strongly dependent on the thickness of Nd, which is in agreement with experimental data. Self consistent solutions of the spin accumulation model and the local magnetisation were used in the simulations. It was not possible to obtain agreement with experiment under the assumption of an enhanced damping in a single Py monolayer. Instead, it was found that the enhanced damping due to spin pumping needed to be spread across two monolayers of Py. This is suggested to arise from interface mixing. Subsequently, the temperature dependence of the effective damping was investigated. It is found that, with increasing temperature, the influence of thermally-induced spin fluctuations on magnetic damping becomes stronger with increasing Nd thickness.

Item Type: Article
Uncontrolled Keywords: Atomistic spin model; spin accumulation model; spin pumping; 0204 Condensed Matter Physics; 0912 Materials Engineering; 1007 Nanotechnology; Fluids & Plasmas; 4016 Materials engineering; 4018 Nanotechnology; 5104 Condensed matter physics
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SWORD Depositor: Symplectic Elements
Depositing User: Symplectic Elements
Date Deposited: 27 Mar 2024 09:33
Last Modified: 06 May 2024 12:45

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