Exact Intrinsic Localized Excitation of an Anisotropic Ferromagnetic Spin Chain in External Magnetic Field with Gilbert Damping, Spin Current and PT-Symmetry

TL;DR

This paper derives exact localized spin excitations in an anisotropic ferromagnetic chain under magnetic fields, damping, and spin currents, demonstrating stabilization via PT-symmetry and spin transfer effects.

Contribution

It provides the first exact solutions for intrinsic localized excitations in anisotropic ferromagnetic chains with damping and external fields, including stabilization mechanisms.

Findings

Exact localized excitation solutions derived

Spin current can stabilize damping effects

PT-symmetric structures can sustain excitations

Abstract

We obtain the exact one-spin intrinsic localized excitation in an anisotropic Heisenberg ferromagnetic spin chain in a constant/variable external magnetic field with Gilbert damping included. We also point out how an appropriate magnitude spin current term in a spin transfer nano-oscillator (STNO) can stabilize the tendency towards damping. Further, we show how this excitation can be sustained in a recently suggested PT-symmetric magnetic nanostructure. We also briefly consider more general spin excitations.