Spin pumping of two-dimensional electron gas with Rashba and Dresselhaus spin-orbit interactions

TL;DR

This paper presents a theoretical study of spin pumping in a ferromagnetic insulator and two-dimensional electron gas with Rashba and Dresselhaus spin-orbit interactions, revealing how FMR linewidth relates to spin texture.

Contribution

It introduces a theoretical framework for analyzing spin pumping effects in 2DEG with combined Rashba and Dresselhaus interactions, linking FMR linewidth to spin texture insights.

Findings

Linewidth increases due to interfacial exchange coupling.

Enhancement of Gilbert damping depends on FMR frequency and spin orientation.

FMR setup can probe the spin texture of 2DEG at the Fermi surface.

Abstract

We theoretically consider spin pumping in a junction between a ferromagnetic insulator (FI) and a two-dimensional electron gas (2DEG) in which the Rashba and Dresselhaus spin-orbit interactions coexist. Using second-order perturbation theory, we derive an increase in linewidth in the case of an interfacial exchange coupling in a ferromagnetic resonance (FMR) experiment. We clarify how the enhancement of Gilbert damping depends on the resonant frequency and spin orientation of the FI. We show that this setup of an FMR experiment can provide information on the spin texture of 2DEG at the Fermi surface.