Dynamic control of spin wave spectra using spin-polarized currents

TL;DR

This paper presents a method to dynamically control spin wave spectra in a nanostripe waveguide using spin-polarized currents, enabling fast switching of transmission properties for magnonic filters.

Contribution

It introduces a novel approach to modulate spin wave spectra via spin-polarized currents, demonstrating rapid switching and potential for low-dissipation magnonic devices.

Findings

Stable periodic magnetization structures can be induced by vertical spin-polarized currents.

A pronounced band gap in spin wave transmission is observed.

Switching between rejection and transmission occurs in less than 3 nanoseconds.

Abstract

We describe a method of controlling the spin wave spectra dynamically in a uniform nanostripe waveguide through spin-polarized currents. A stable periodic magnetization structure is observed when the current flows vertically through the center of nanostripe waveguide. After being excited, the spin wave is transmitted at the sides of the waveguide. Numerical simulations of spin-wave transmission and dispersion curves reveal a single, pronounced band gap. Moreover, the periodic magnetization structure can be turned on and off by the spin-polarized current. The switching process from full rejection to full transmission takes place within less than 3ns. Thus, this type magnonic waveguide can be utilized for low-dissipation spin wave based filters.