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

TL;DR

This paper demonstrates a method for low-power vortex-core switching in magnetic nanodisks using orthogonal Gaussian-pulse currents, with optimal parameters derived analytically and confirmed experimentally, paving the way for energy-efficient data storage.

Contribution

The study introduces a novel vortex-core switching technique using tailored Gaussian-pulse currents, with analytical and experimental validation of optimal pulse parameters.

Findings

Optimal pulse width and delay are determined by the disk's eigenfrequency.

Experimental results agree with analytical and micromagnetic calculations.

The method enables energy-efficient vortex-core switching for data storage.

Abstract

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