Abstract
The magnetic vortices are promising candidates as information carriers for future energy efficient spintronic devices (e.g. memory), and the key challenge is to achieve reversible voltage driven magnetic switching of vortex state at nanometer scale. In this work, we demonstrated the strain-mediated voltage-controlled reversible switching between double-vortex domain and single domain in a nanoscale multiferroic heterostructure, consisting of a Co ellipse nanomagnet on a PbMg1/3Nb2/3O3-PbTiO3 piezoelectric substrate, by means of micromagnetic simulation. In this scheme, the double-vortex state can be deterministically written and erased triggered by applying electric voltage mediated by coupling strain. Besides, the critical strains for triggering the magnetic switching were also explored, which are strongly depended on geometric shape (i.e., aspect ratio) of the ellipse. These findings suggest the possibility of voltage-driven creation/erasure and switching of double-vortex states in elliptical nanomagnets, which provide a new pathway for development of energy efficient magnetoelectric memory and logic devices based on nanoscale multiferroic heterostructures.
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