Stability of precessing domain walls in ferromagnetic nanowires

Stability for Static Walls in Ferromagnetic Nanowires

The goal of this article is to analyze the time asymptotic stability of one dimensional Bloch walls in ferromagnetic materials. The equation involved in modelling such materials is the Landau-Lifchitz system which is non-linear and parabolic. We demonstrate that the equilibrium states called Bloch walls are asymptotically stable modulo a rotation and a translation transverse to the wall. The li...

Dynamic Notch Pinning Fields for Domain Walls in Ferromagnetic Nanowires

Stability of 2 π domain walls in ferromagnetic

Gabriel D. Chaves-O'Flynn, Daniel Bedau, Eric Vanden-Eijnden, A. D. Kent D. L. Stein Department of Physics, New York University, 4Washington Place, New York, New York 10003, USA and Courant Institute of Mathematical Sciences, New York University, New York, New York, 10012 The stability of 2π domain walls in ferromagnetic nanorings is investigated via the calculation of the energy barrier that s...

Metastable magnetic domain walls in cylindrical nanowires

The stability of the asymmetric domain wall (ATDW) in soft magnetic cylindrical nanowires and nanotubes is investigated using micromagnetic simulations. Our calculated phase diagram shows that for cylindrical permalloy nanowires, the transverse domain wall (TDW) is the ground state for radii below 20 nm whilst the Bloch point wall (BPW) is favoured in thicker wires. The ATDW stabilises only as ...

Direct imaging of current-driven domain walls in ferromagnetic nanostripes

To better understand the response of domain walls to current-induced spin transfer torques, we have directly imaged the internal magnetic structure of domain walls in current-carrying ferromagnetic nanostripes. Domain wall images were acquired both while a constant current was flowing through the wire, and after applying current pulses. Domain walls ranging from vortex walls in wide 1 m wires t...