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• The energy needed to switch the core is calculated following the method of J.-M. Hu, Z. Li, L.-Q. Chen, and C.-W. Nan, Nat. Commun. 2, 553 (2011), and is of the order (Equation presented), where (Equation presented) is the number of rf cycles needed to switch the core, (Equation presented) is the remnant polarization of the ferroelectric, (Equation presented) is the device area, and (Equation presented) is the peak amplitude of the rf voltage. NCAOBW 2041-1723 10.1038/ncomms1564
• According to Ref. [4] a 30 Oe linear rf field requires (Equation presented) to switch the vortex core for a Fe based device. For a 600 nm (Equation presented) coplanar waveguide (the waveguide is set slightly larger than the 500 nm device) 0.143 W is required to generate this field, see G.B.G Stenning, New J. Phys. 17, 013019 (2015). In the 10 ns needed to switch the core the energy requirement is therefore (Equation presented) nJ. NJOPFM 1367-2630 10.1088/1367-2630/17/1/013019