Chaotic dynamics of magnetic domain walls in nanowires

Abstract

The nonlinear dynamics of a transverse domain wall (TDW) in Permalloy and Nickel nanostrips with two artificially patterned pinning centers is studied numerically up to rf frequencies. The phase diagram frequency - driving amplitude shows a rich variety of dynamical behaviors depending on the material parameters and the type and shape of pinning centers. We find that T-shaped traps (antinotches) create a classical double well Duffing potential that leads to a small chaotic region in the case of Nickel and a large one for Py. In contrast, the rectangular constrictions (notches) create an exponential potential that leads to larger chaotic regions interspersed with periodic windows for both Py and Ni. The influence of temperature manifests itself by enlarging the chaotic region and activating thermal jumps between the pinning sites while reducing the depinning field at low frequency in the notched strips.

References in corpus (7)

• Identification of the dominant precession damping mechanism in Fe, Co, and Ni by first-principles calculations
• Domain wall pinning and potential landscapes created by constrictions and protrusions in ferromagnetic nanowires
• Current-driven and field-driven domain walls at nonzero temperature
• Domain wall pinning and interaction in rough cylindrical nanowires
• Chaotic dynamics of superconductor vortices in the plastic phase
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Cited by in corpus (4)

• Systematic motion of magnetic domain walls in notched nanowires under ultra-short current pulses
• Signal detection based on the chaotic motion of an antiferromagnetic domain wall
• Chaotic spin precession in antiferromagnetic domain walls
• Breather bound states in a parametrically driven magnetic wire