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High JcYBa2Cu3O7-δ (YBCO) films have been fabricated on LaMnO3 buffered ion-beam assisted deposition (IBAD) MgO template layers. A LaMnO3 buffer layer is compatible with MgO surfaces and also provides a good template for growing high current density YBCO films. LaMnO3 buffer layers were deposited using rf magnetron sputtering. On LaMnO3-buffered-MgO  single crystal substrates, YBCO films with a Jc of over 4 M/cm2 were grown using both pulsed laser deposition (PLD) and ex-situ BaF2 process. Using PLD, Jc of 1.8 MA/cm2 at 77 K was obtained on 200-nm-thick YBCO films grown on LaMnO3-buffered MgO IBAD/Ni-alloy substrates. In addition, an Ic of 230 A/cm-width was obtained for 1.65-μm-thick YBCO films grown on LaMnO3-buffered MgO IBAD/Ni-alloy substrates using PLD at Los Alamos National Laboratory. This performance is comparable to the best single-layer results achieved on IBAD-MgO substrates.