Quantum dynamics of vortices in mesoscopic magnetic disks

Abstract

Model of quantum depinning of magnetic vortex cores from line defects in a disk geometry and under the application of an in-plane magnetic field has been developed within the framework of the Caldeira-Leggett theory. The corresponding instanton solutions are computed for several values of the magnetic field. Expressions for the crossover temperature Tc and for the depinning rate Γ(T) are obtained. Fitting of the theory parameters to experimental data is also presented.

8 pages

References in corpus (4)

• Low-frequency vortex dynamic susceptibility and relaxation in mesoscopic ferromagnetic dots
• Quantum depinning of the magnetic vortex core in micron-size permalloy disks
• Excitation modes of vortices in sub-micron magnetic disks
• Quantum Tunneling of Normal-Superconducting Interfaces in a Type-I Superconductor

Cited by in corpus (4)

• Topological magnetic solitons on a paraboloidal shell
• Localized magnetic fields enhance the field-sensitivity of the gyrotropic resonance frequency of a magnetic vortex
• Quantum Depinning of a Magnetic Skyrmion
• Broadband optomechanical transduction of nanomagnetic spin modes