Intrinsic and extrinsic contributions to spin scattering in Pt
Ryan Freeman, Andrei Zholud, Zhiling Dun, Haidong Zhou, Sergei, Urazhdin
TL;DR
This study investigates spin scattering mechanisms in platinum using nanoscale spin valves, revealing temperature-dependent dominance of extrinsic and intrinsic processes, with implications for spintronic device performance.
Contribution
It provides experimental evidence distinguishing extrinsic and intrinsic spin scattering contributions in Pt across different temperatures.
Findings
Extrinsic Elliot-Yafet scattering dominates at room temperature.
Intrinsic Dyakonov-Perel mechanism dominates at cryogenic temperatures.
Spin relaxation is suppressed in Pt interfaced with ferromagnets.
Abstract
We utilize nanoscale spin valves with Pt spacer layers to characterize spin scattering in Pt. Analysis of the spin lifetime determined from our measurements indicates that the extrinsic Elliot-Yafet spin scattering is dominant at room temperature, while the intrinsic Dyakonov-Perel mechanism dominates at cryogenic temperatures. The significance of the latter is supported by the suppression of spin relaxation in Pt layers interfaced with a ferromagnet, likely caused by the competition between the effective exchange and spin-orbit fields.
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