Observing the spin-Coulomb drag in spin-valve devices

TL;DR

This paper discusses methods to observe and separate the spin-Coulomb drag effect from other resistivity mechanisms in spin-valve devices, advancing understanding of spin-dependent electron interactions.

Contribution

It introduces two novel methods to isolate the spin-Coulomb drag contribution in spin-valve devices, addressing a key experimental challenge.

Findings

Proposed methods enable clearer observation of spin-Coulomb drag.

Demonstrated separation of spin-drag resistivity from conventional resistivity.

Enhanced understanding of spin-dependent electron interactions in metals and semiconductors.

Abstract

The Coulomb interaction between electrons of opposite spin orientations in a metal or in a doped semiconductor results in a negative off-diagonal component of the electrical resistivity matrix -- the so-called "spin-drag resistivity". It is generally quite difficult to separate the spin-drag contribution from more conventional mechanisms of resistivity. In this paper I discuss two methods to accomplish this separation in a spin-valve device.