Response of the chiral soliton lattice to spin polarized currents

TL;DR

This paper theoretically investigates how spin-polarized currents influence a chiral soliton lattice in a helimagnet, revealing steady motion at low currents and destabilization at high currents, with implications for spintronic device control.

Contribution

It provides a theoretical analysis of the dynamic response of a chiral soliton lattice to spin-polarized currents, including motion and destabilization mechanisms.

Findings

Steady lattice motion with velocity proportional to current at low densities.

Destabilization of the lattice leading to ferromagnetic state at high currents.

Potential application as an erasure mechanism in spintronics.

Abstract

Spin polarized currents originate a spin-transfer torque that enables the manipulation of magnetic textures. Here we theoretically study the effect of a spin-polarized current on the magnetic texture corresponding to a chiral soliton lattice in a monoaxial helimagnet under a transverse magnetic field. At sufficiently small current density the chiral soliton lattice reaches a steady motion state with a velocity proportional to the intensity of the applied current, the mobility being independent of the density of solitons and the magnetic field. This motion is accompanied with a small conical distortion of the chiral soliton lattice. At large current density the spin-transfer torque destabilizes the chiral soliton lattice, driving the system to a ferromagnetic state parallel to the magnetic field. We analyze how the deformation of the chiral soliton lattice depends on the applied current density. The destruction of the chiral soliton lattice under current could serve as a possible erasure mechanisms for spintronic applications.