The temperature dependence of spin pumping in Py/W AND Py/Pt bilayers

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Abstract

The solid thin films of Py/Pt and Py/W heterostructures have been studied using the ferromagnetic resonance method. The temperature dependences of the Gilbert damping parameter and voltage of the the inverse spin Hall effect (ISHE) have been obtained in the 5–290 K temperature range. An anomalous increase in the Gilbert damping parameter in the vicinity of 50 K and a change in the voltage of ISHE has been found. It has been concluded that an increase in the Gilbert damping parameter is of spin-orbital nature.

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А. S. Pakhomov

Moscow Institute of Physics and Technology, Phystech; LLC New Spintronic Technologies

Author for correspondence.
Email: a.pakhomov@nst.tech

Center for Two-Dimensional Materials and Photonics

Russian Federation, 141701, Dolgoprudny; 121205, Moscow

P. N. Skirdkov

LLC New Spintronic Technologies; Prokhorov General Physics Institute, Russian Academy of Sciences

Email: a.pakhomov@nst.tech
Russian Federation, 121205, Moscow; 119991, Moscow

V. V. Yurlov

Moscow Institute of Physics and Technology, Phystech; LLC New Spintronic Technologies

Email: a.pakhomov@nst.tech

Center for Two-Dimensional Materials and Photonics

Russian Federation, 141701, Dolgoprudny; 121205, Moscow

A. I. Chernov

Moscow Institute of Physics and Technology, Phystech

Email: a.pakhomov@nst.tech

Center for Two-Dimensional Materials and Photonics

Russian Federation, 141701, Dolgoprudny

K. A. Zvezdin

LLC New Spintronic Technologies

Email: a.pakhomov@nst.tech
Russian Federation, 121205, Moscow

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2. Fig. 1. Dependence of the Hilbert attenuation parameter for samples Py/W (black full squares), Py/Pt (red full circles). An increase in the Hilbert parameter is clearly observed with a decrease in temperature from 100 K to 50 K, then down to 5 K there is a decrease in the parameter.

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3. Fig. 2. Voltage dependence of the sample compartment Py/W (black full squares), Py/Pt (red full circles). There is an increase in the AXIS voltage with a decrease in temperature from room temperature to ~130 K. Further, up to 50 K, the voltage is reduced. Then there is a sharp rise.

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