Estimation of spin-diffusion length from the magnitude of spin current absorption

TL;DR

This paper introduces a method to estimate the spin diffusion length in ferromagnetic/nonmagnetic structures by analyzing spin current absorption, using an electro-transmission line model that aligns well with experimental data.

Contribution

It presents a novel approach to determine spin diffusion length from spin signal reduction in complex structures, enhancing measurement accuracy.

Findings

The method accurately predicts spin diffusion length from experimental data.

Good agreement between theoretical calculations and experimental results.

The approach enables analysis of electrically floating wires in spintronic devices.

Abstract

We demonstrate the method to calculate the spatial distributions of the spin current and accumulation in the multi-terminal ferromagnetic/nonmagnetic hybrid structure using an approximate electro-transmission line. The analyses based on the obtained equation yield the results in good agreement with the experimental ones. This implies that the method allows us to determine the spin diffusion length of additionally connected electrically floating wire from the reduction of the spin signal.