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

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