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

DOI: 10.1039/C9NR08672B DOI Help

Authors: Massimo Ghidini (University of Cambridge; Diamond Light Source; University of Parma) , Rhodri Mansell (University of Cambridge) , Raffaele Pellicelli (University of Parma; Istituto d'Istruzione Superiore A. Zanelli) , David Pesquera (University of Cambridge) , Bhaskaran Nair (University of Cambridge) , Xavier Moya (University of Cambridge) , Saeedeh Farokhipoor (University of Cambridge) , Francesco Maccherozzi (Diamond Light Source) , Crispin Barnes (University of Cambridge) , Russell Cowburn (University of Cambridge) , Sarnjeet Dhesi (Diamond Light Source) , Neil Mathur (University of Cambridge)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nanoscale

State: Published (Approved)
Published: February 2020
Diamond Proposal Number(s): 11843

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 was 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.

Diamond Keywords: Data Storage; Ferroelectricity; Ferromagnetism

Subject Areas: Physics, Materials, Information and Communication Technology

Instruments: I06-Nanoscience (XPEEM)

Added On: 20/02/2020 14:19

Discipline Tags:

Quantum Materials Multiferroics Physics Electronics Components & Micro-systems Information & Communication Technologies Magnetism Materials Science

Technical Tags:

Microscopy Electron Microscopy (EM) PhotoEmmission Electron Microscopy (PEEM)