Investigation of magnetization dynamics damping in Ni80Fe20/Nd-Cu bilayer at room temperature

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Abstract

Focusing on the Ni80Fe20 (Py)/Nd-Cu bilayers, the magnetization dynamic damping from spin pumping effect is investigated systematically by doping itinerant Cu in rear earth metal Nd. Various Ta/Py/Nd1-xCux/Ta/Si films with x = 0%, 16%, 38%, 46% and 58% are prepared by magnetron sputtering. For every content of Cu, the thickness of Nd-Cu layer is changed from 1 nm to 32 nm. The damping coefficient increases with increasing the thickness of Nd-Cu layer, which shows the trend of the spin pumping behavior. Also, with increasing Cu concentration in the Nd-Cu layer, the damping coefficient decreases, implying that the spin-orbit coupling in Nd-Cu layer is indeed cut down by high itinerant of Cu dopants. It is interesting that the spin diffusion length (λSD) in the Nd-Cu layer for different Cu dopants is not found to increase monotonously.

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Fan, W., Fu, Q., Qian, Q., Chen, Q., Liu, W., Zhou, X., … Zhai, Y. (2018). Investigation of magnetization dynamics damping in Ni80Fe20/Nd-Cu bilayer at room temperature. AIP Advances, 8(5). https://doi.org/10.1063/1.5006735

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