Damping-like effects in Heisenberg spin chain caused by the site-dependent bilinear interaction. (7th January 2021)

• Record Type: Journal Article
• Authors: Zhang, Yu-Juan; Zhao, Dun; Li, Zai-Dong
• Is Part Of: Communications in theoretical physics. Volume 73:Number 1(2021)
• Publication Date: 2021-01-07
• Subjects: Heisenberg spin chain -- site-dependent bilinear interaction -- spin-transfer torque -- magnetic soliton -- damping effect; Physics -- Periodicals; 530.105
• DOI: 10.1088/1572-9494/abc7ab
• Languages: English
• ISSNs: 0253-6102

Abstract

Abstract: We investigate a continuous Heisenberg spin chain equation which models the local magnetization in ferromagnet with time- and site-dependent inhomogeneous bilinear interaction and time-dependent spin-transfer torque. By establishing the gauge equivalence between the spin chain equation and an integrable generalized nonlinear Schrödinger equation, we present explicitly a novel nonautonomous magnetic soliton solution for the spin chain equation. The results display how the dynamics of the magnetic soliton can be controlled by the bilinear interaction and spin-polarized current. Especially, we find that the site-dependent bilinear interaction may break some conserved quantity, and give rise to damping-like effect in the spin evolution.