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Instruments / Technical Area	Publication Details	Published
I06-Nanoscience	Voltage-driven displacement of magnetic vortex cores M. Ghidini , R. Pellicelli , R. Mansell , D. Pesquera , B. Nair , X. Moya , S. Farokhipoor , F. Maccherozzi , C. H. W. Barnes , R. P. Cowburn , S. S. Dhesi , N. D. Mathur Journal Of Physics D: Applied Physics 53 DOI: 10.1088/1361-6463/aba01d Diamond Proposal Number(s): [11843] Open Access Show 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.	Oct 2020
I06-Nanoscience	Large magnetoelectric coupling in multiferroic oxide heterostructures assembled via epitaxial lift-off D. Pesquera , E. Khestanova , M. Ghidini , S. Zhang , A. P. Rooney , F. Maccherozzi , P. Riego , S. Farokhipoor , J. Kim , X. Moya , M. E. Vickers , N. A. Stelmashenko , S. J. Haigh , S. S. Dhesi , N. D. Mathur Nature Communications 11 DOI: 10.1038/s41467-020-16942-x Diamond Proposal Number(s): [14745] Open Access Show Abstract ▼ Abstract: Epitaxial films may be released from growth substrates and transferred to structurally and chemically incompatible substrates, but epitaxial films of transition metal perovskite oxides have not been transferred to electroactive substrates for voltage control of their myriad functional properties. Here we demonstrate good strain transmission at the incoherent interface between a strain-released film of epitaxially grown ferromagnetic La0.7Sr0.3MnO3 and an electroactive substrate of ferroelectric 0.68Pb(Mg1/3Nb2/3)O3-0.32PbTiO3 in a different crystallographic orientation. Our strain-mediated magnetoelectric coupling compares well with respect to epitaxial heterostructures, where the epitaxy responsible for strong coupling can degrade film magnetization via strain and dislocations. Moreover, the electrical switching of magnetic anisotropy is repeatable and non-volatile. High-resolution magnetic vector maps reveal that micromagnetic behaviour is governed by electrically controlled strain and cracks in the film. Our demonstration should inspire others to control the physical/chemical properties in strain-released epitaxial oxide films by using electroactive substrates to impart strain via non-epitaxial interfaces.	Jun 2020
I06-Nanoscience	Voltage-driven annihilation and creation of magnetic vortices in Ni discs Massimo Ghidini , Rhodri Mansell , Raffaele Pellicelli , David Pesquera , Bhaskaran Nair , Xavier Moya , Saeedeh Farokhipoor , Francesco Maccherozzi , Crispin Barnes , Russell Cowburn , Sarnjeet Dhesi , Neil Mathur Nanoscale DOI: 10.1039/C9NR08672B Diamond Proposal Number(s): [11843] Show Abstract ▼ 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.	Feb 2020

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