Fabrication of long‐length ion beam‐assisted deposited MgO templates for YBCO‐coated conductors

Abstract

Abstract The biaxially textured ion beam‐assisted deposited (IBAD)‐MgO templates were successfully prepared on polycrystalline Hastelloy metal substrate with reel‐to‐reel system for YB 2 Cu 3 O 7− δ (YBCO)‐coated conductors. By the solution deposition planarization technique, amorphous Y 2 O 3 films were coated on untreated Hastelloy substrate as the bed layer to obtain smooth, dense, and crack‐free surface for subsequent IBAD‐MgO deposition. The 50 m long IBAD‐MgO and homo‐epitaxial (epi)‐MgO buffer layers deposited on Y 2 O 3 films exhibit excellent crystallographic consistency along the scope with full width half maximum (FWHM) values of (110) Δ Φ and (200) Δ ω in the range of 5.5°–6.0° and 3.0°–3.5°, respectively. To match the lattice constant of YBCO material, LaMnO 3 cap layer was fabricated on IBAD‐MgO templates by radio frequency (rf) magnetron sputtering with the FWHM values of in‐plane and out‐of‐plane of 6.8° and 3.7°, respectively, indicating excellent biaxial texture.