Polarization-selective vortex-core switching by tailored orthogonal Gaussian-pulse currents

Abstract

We experimentally demonstrate low-power-consumption vortex-core switching in magnetic nanodisks using tailored rotating magnetic fields produced with orthogonal and unipolar Gaussian-pulse currents. The optimal width of the orthogonal pulses and their time delay are found, from analytical and micromagnetic numerical calculations, to be determined only by the angular eigenfrequency ${\ensuremath{\omega}}_{D}$ for a given vortex-state disk of polarization $p$, such that $\ensuremath{\sigma}=1/{\ensuremath{\omega}}_{D}$ and $\ensuremath{\Delta}t=\frac{\ensuremath{\pi}}{2}p/{\ensuremath{\omega}}_{D}$. The estimated optimal pulse parameters are in good agreement with the experimental results. This work lays a foundation for energy-efficient information recording in vortex-core cross-point architecture.