Strain manipulation of vortex core in bi-component magnetic nanodisks

Abstract

Magnetic vortex as one of the quintessentially non-uniform magnetic structure that can be found to commonly exist in micrometer or submicrometer sized ferromagnetic thin films. Here, we present that the vortex core can be efficiently expelled from the central region and excited into gyrotropic motion by using a voltage induced strain in bi-component magnetic nanodisks. In particular, the polarity can be deterministic switched by proper modulation the amplitude and frequency of applied voltage. The related results of micromagnetic simulations indicated that the magnetic vortex polarity is reversed through the nucleation-annihilation process of topological vortex-antivortex pairs or rotation-fusion edge soliton pairs. This voltage-controlled low-power vortex polarity switching scheme has the ability to accurately address individual magnets in dense arrays and also is compatible with integrated circuit techniques, which provides an additional route for the design of vortex-based on-chip devices.