Electrical measurement of magnetic-field-impeded polarity switching of a ferromagnetic vortex core

Abstract

Vortex core polarity switching in NiFe disks has been evidenced using an all-electrical rectification scheme. Both simulation and experiments yield a consistent loss of the rectified signal when driving the core at high powers near its gyrotropic resonant frequency. The frequency range over which the loss occurs grows and shifts with increasing signal power, consistent with non-linear core dynamics and periodic switching of the core polarity induced by the core attaining its critical velocity. We demonstrate that core polarity switching can be impeded by displacing the core towards the disk's edge where an increased core stiffness reduces the maximum attainable core velocity.

6 pages, 5 figures

References in corpus (8)

• Magnetic Vortex Resonance in Patterned Ferromagnetic Dots
• Magnetic Vortex Core Reversal by Excitation of Spin Waves
• Current-driven resonant excitation of magnetic vortex
• A Frequency-Controlled Magnetic Vortex Memory
• Bistability of vortex core dynamics in a single perpendicularly magnetized nano-disk
• Universal criterion and phase diagram for switching a magnetic vortex core in soft magnetic nanodots
• Optimal control of vortex core polarity by resonant microwave pulses
• Localized magnetic fields enhance the field-sensitivity of the gyrotropic resonance frequency of a magnetic vortex

Cited by in corpus (3)

• Temperature-Dependent Anisotropic Magnetoresistance and Spin-Torque-Driven Vortex Dynamics in a Single Microdisk
• Chirality-mediated bistability and strong frequency downshifting of the gyrotropic resonance of a dynamically de-stiffened magnetic vortex
• Effects of the rf current and bias field direction on the transition from linear to non-linear gyrotropic dynamics in magnetic vortex structures