Spin-torque effect on spin wave modes in magnetic nanowires

TL;DR

This paper investigates how spin-polarized currents influence spin wave modes in magnetic nanowires, revealing mode suppression, propagation, and mode conversion phenomena near critical current levels.

Contribution

It provides new insights into current-induced control of spin wave modes, highlighting the transition from edge to uniform modes in nanowires.

Findings

Uniform mode is suppressed near critical current

Edge mode propagates into the sample at critical current

Higher spin wave modes are pushed away by the current

Abstract

The interaction between a spin polarized dc electrical current and spin wave modes of a cylindrical nanowire is investigated in this report. We found that close to the critical current, the uniform mode is suppressed, while the edge mode starts to propagate into the sample. When the current exceeds the critical value, this phenomenon is even more accentuated. The edge mode becomes the uniform mode of the nanowire. The higher spin wave modes are slowly pushed away by the current until the propagating mode remains.