Voltage-driven displacement of magnetic vortex cores. (3rd August 2020)

• Record Type: Journal Article
• Authors: 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
• Is Part Of: Journal of physics. Volume 53:Number 43(2020)
• Publication Date: 2020-08-03
• Subjects: magnetoelectrics -- magnetic imaging -- nanomagnetism; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/aba01d
• Languages: English
• ISSNs: 0022-3727

Abstract

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.