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.
Highlights
The magnetization dynamics of magnetic thin films is an important direction in the field of spin electronics, which is relevant to the applications in spintronic devices such as magnetic sensor, high density storage, and nano-oscillator.[1,2,3]
It is well known that the orbital moment and orbit-spin interactions in traditional transition metals and alloys are substantially quenched due to the influence of the crystal field, the spin damping coefficient is very small, for instance, the magnetization damping coefficient of permalloy (Py) films is reported ranging only 7-10×10-3.6,7 The rare earth metal with un-fulled f electrons located in the inner atom shell is not affected by the crystal field, it possesses strong spin-orbit coupling[8,9] and could enhance the dynamic damping of RE-TM combined systems
In this paper, focusing on rare earth Nd layer with Cu dopants, the interfacial spin-pump effect in Py/Nd-Cu bilayer is investigated by Ferromagnetic Resonance (FMR)
Summary
Damping of FM layer can be realized by the spin pumping effect using RE film inserted instead of normal-metal. In this paper, focusing on rare earth Nd layer with Cu dopants, the interfacial spin-pump effect in Py/Nd-Cu bilayer is investigated by Ferromagnetic Resonance (FMR).
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