Publication Date
2-4-2020
Document Type
Article
Publication Title
Physical Review B
Volume
101
Issue
5
DOI
10.1103/PhysRevB.101.054407
Abstract
We study the dynamics of domain walls (DWs) in a metallic, ferromagnetic nanowire. We develop a Keldysh collective coordinate technique to describe the effect of conduction electrons on rigid magnetic structures. The effective Lagrangian and Langevin equations of motion for a DW are derived. The DW dynamics is described by two collective degrees of freedom: position and tilt-angle. The coupled Langevin equations therefore involve two correlated noise sources, leading to a generalized fluctuation-dissipation theorem (FDT). The DW response kernel due to electrons contains two parts: one related to dissipation via FDT, and another `inertial' part. We prove that the latter term leads to a mass for both degrees of freedom, even though the intrinsic bare mass is zero. The electron-induced mass is present even in a clean system without pinning or specifically engineered potentials. The resulting equations of motion contain rich dynamical solutions and point toward a new way to control domain wall motion in metals via the electronic system properties. We discuss two observable co nsequences of the mass, hysteresis in the DW dynamics and resonant response to ac current.
Funding Number
DESC0001911
Funding Sponsor
Simons Foundation
Keywords
Fluctuation theorems, Magnetic domains, Magnetization dynamics, Spintronics
Department
Physics and Astronomy
Recommended Citation
Hilary M. Hurst, Victor Galitski, and Tero T. Heikkilä. "Electron-induced massive dynamics of magnetic domain walls" Physical Review B (2020). https://doi.org/10.1103/PhysRevB.101.054407
Comments
This article originally appeared in Physical Review B, volume 101, issue 5, 2020, published by the American Physical Society. ©2020 American Physical Society. The article can also be found online at this link.
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