Spin-scattering rates in metallic thin films measured by ferromagnetic resonance damping enhanced by spin-pumping

被引：54
作者：
Boone, C. T. [1 ]
Shaw, J. M. [1 ]
Nembach, H. T. [1 ]
Silva, T. J. [1 ]
机构：
[1] NIST, Boulder, CO 80305 USA
来源：
JOURNAL OF APPLIED PHYSICS | 2015年 / 117卷 / 22期
关键词：
ELECTRICAL-RESISTIVITY; OSCILLATOR DRIVEN; MEMORY LOSS; HALL; MODEL; RELAXATION; INTERFACES; PARTICLES; DYNAMICS; CHARGE;
D O I：
10.1063/1.4922581
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We determined the spin-transport properties of Pd and Pt thin films by measuring the increase in ferromagnetic resonance damping due to spin-pumping in ferromagnetic (FM)-nonferromagnetic metal (NM) multilayers with varying NM thicknesses. The increase in damping with NM thickness depends strongly on both the spin-and charge-transport properties of the NM, as modeled by diffusion equations that include both momentum-and spin-scattering parameters. We use the analytical solution to the spin-diffusion equations to obtain spin-diffusion lengths for Pt and Pd. By measuring the dependence of conductivity on NM thickness, we correlate the charge-and spin-transport parameters, and validate the applicability of various models for momentum-scattering and spin-scattering rates in these systems: constant, inverse-proportional (Dyakanov-Perel), and linear-proportional (Elliot-Yafet). We confirm previous reports that the spin-scattering time appears to be shorter than the momentum scattering time in Pt, and the Dyakanov-Perel-like model is the best fit to the data.
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页数：8
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