Voltage-driven displacement of magnetic vortex cores

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2020-10-21
Major/Subject
Mcode
Degree programme
Language
en
Pages
6
Series
Journal of Physics D: Applied Physics, Volume 53, issue 43
Abstract
Magnetic vortex cores in polycrystalline Ni discs underwent non-volatile displacements due to voltage-driven ferroelectric domain switching in single-crystal BaTiO3. This behaviour was observed using photoemission electron microscopy to image both the ferromagnetism and ferroelectricity, while varying in-plane sample orientation. The resulting vector maps of disc magnetization match well with micromagnetic simulations, which show that the vortex core is translated by the transit of a ferroelectric domain wall, and thus the inhomogeneous strain with which it is associated. The non-volatility is attributed to pinning inside the discs. Voltage-driven displacement of magnetic vortex cores is novel, and opens the way for studying voltage-driven vortex dynamics.
Description
Keywords
magnetic imaging, magnetoelectrics, nanomagnetism, Electronic, Optical and Magnetic Materials, Condensed Matter Physics, Acoustics and Ultrasonics, Surfaces, Coatings and Films, 114 Physical sciences
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Citation
Ghidini , M , Pellicelli , R , Mansell , R , Pesquera , D , Nair , B , Moya , X , Farokhipoor , S , Maccherozzi , F , Barnes , C H W , Cowburn , R P , Dhesi , S S & Mathur , N D 2020 , ' Voltage-driven displacement of magnetic vortex cores ' , Journal of Physics D: Applied Physics , vol. 53 , no. 43 , 434003 . https://doi.org/10.1088/1361-6463/aba01d