Fabrication of highly textured IBAD-MgO template by continuous reel-to-reel process and its characterization

Abstract

Highly textured long-length MgO template was successfully deposited on a polycrystalline metal tape using ion-beam-assisted deposition (IBAD). To increase the speed of the IBAD processing, tape moving system was modified from a single-turn to multi-turn system with 14-pass and five heating zones, which leads to larger deposition area. The overall process consists of reel-to-reel electro-polishing of a Hastelloy C276 tape, deposition of Al2O3 diffusion layer and Y2O3 seed layer, deposition of IBAD-MgO and homo-epi MgO layer, and deposition of LaMnO3 (LMO) buffer layer and YBa2Cu3O7−δ (YBCO) superconducting layer using pulsed laser deposition (PLD). Recently, 100m long IBAD-MgO tape with in-plane texture of Δϕ<7° has been successfully fabricated. Critical current density (Jc) of 0.94MA/cm2 at 77K in self field was obtained from the YBCO coated conductor grown on 20cm long LMO-buffered IBAD-MgO template by the PLD process.