Voltage-driven annihilation and creation of magnetic vortices in Ni discs

M. Ghidini*, R. Mansell, R. Pellicelli, D. Pesquera, B. Nair, X. Moya, S. Farokhipoor, F. MacCherozzi, C. H.W. Barnes, R. P. Cowburn, S. S. Dhesi, N. D. Mathur

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)

Abstract

Using photoemission electron microscopy (PEEM) to image ferromagnetism in polycrystalline Ni disks, and ferroelectricity in their single-crystal BaTiO3 substrates, we find that voltage-driven 90° ferroelectric domain switching serves to reversibly annihilate each magnetic vortex via uniaxial compressive strain, and that the orientation of the resulting bi-domain reveals the chirality of the annihilated vortex. Micromagnetic simulations reveal that only 60% of this strain is required for annihilation. Voltage control of magnetic vortices is novel, and should be energetically favourable with respect to the use of a magnetic field or an electrical current. In future, stray field from bi-domains could be exploited to read vortex chirality. Given that core polarity can already be read via stray field, our work represents a step towards four-state low-power memory applications.

Original languageEnglish
Pages (from-to)5652-5657
Number of pages6
JournalNanoscale
Volume12
Issue number9
DOIs
Publication statusPublished - 7 Mar 2020
MoE publication typeA1 Journal article-refereed

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