Magnetic rogue wave in a perpendicular anisotropic ferromagnetic nanowire with spin-transfer torque

TL;DR

This paper investigates the formation and control of magnetic rogue waves in ferromagnetic nanowires, revealing how spin-transfer torque influences their dynamics and energy accumulation.

Contribution

It introduces a novel magnetic rogue wave formation mechanism and analytically determines the critical current controlling magnon exchange in ferromagnetic nanowires.

Findings

Magnetic rogue waves are generated from energy and magnon accumulation.

Spin-polarized current controls magnon exchange rate.

Spin-transfer torque has opposite effects below and above critical current.

Abstract

We present the current controlled motion of dynamic soliton embedded in spin wave background in ferromagnetic nanowire. With the stronger breather character we get the novel magnetic rogue wave and clarify its formation mechanism. The generation of magnetic rogue wave is mainly arose from the accumulation of energy and magnons toward to its central part. We also observe that the spin-polarized current can control the exchange rate of magnons between envelope soliton and background, and the critical current condition is obtained analytically. Even more interesting is that the spin-transfer torque plays the completely opposite role for the cases of below and above the critical value.