Alternating Spintronics: Capacitive Behavior of Spin Valves and Resonator Applications

TL;DR

This paper investigates the behavior of spin transport in magnetic heterostructures under alternating currents, revealing capacitive-like impedance effects and proposing novel high-frequency spintronic devices such as a spin resonator.

Contribution

It introduces a time-dependent spin diffusion model to analyze AC spin transport and demonstrates capacitive behavior in spin valves, advancing the field of alternating spintronics.

Findings

Capacitive-like impedance observed in spin valves under AC conditions

Significant differences in spin accumulation patterns between AC and DC

Proposal of a spin resonator device functioning like an LC resonator without a capacitor

Abstract

This study explores the time-dependent spin transport phenomena in magnetic heterostructures under alternating currents (AC), advancing the relatively underdeveloped field of alternating spintronics. Employing a time-dependent spin diffusion model, we show that the interplay of AC frequencies and spin relaxation times reveals significant differences in spin accumulation patterns compared to conventional direct current (DC) scenarios. Of particular interest is the emergence of capacitive-like impedance in a spin valve under AC conditions, which is especially pronounced in antiparallel spin configurations. These findings open up possibilities for developing high-frequency spintronic devices, including the proposed "spin resonator", which functions like a standard LC resonator but without a traditional capacitor.