Patent ID: 8053027

Claim:
A method of fabricating a compositionally stratified perovskite oxide multi-layer heterostructure material, comprising: a first depositing step comprising depositing Ba 1-x Sr x TiO 3 perovskite oxide, where x is in the range of 0.36-0.44, inclusive, on a substrate; a first crystallizing step comprising crystallizing the Ba 1-x Sr x TiO 3 perovskite oxide, where x is in the range of 0.36-0.44, inclusive, producing a lower layer; a second depositing step comprising depositing Ba 1-x Sr x TiO 3 perovskite oxide where x is in the range of 0.23-0.27, inclusive, onto the lower layer; a second crystallizing step comprising crystallizing the Ba 1-x Sr x TiO 3 perovskite oxide where x is in the range of 0.23-0.27, inclusive, producing an intermediate layer; a third depositing step comprising depositing Ba 1-x Sr x TiO 3 perovskite oxide where x in the range of 0.08-0.13, inclusive, onto the intermediate layer; and a third crystallizing step comprising crystallizing the Ba 1-x Sr x TiO 3 perovskite oxide where x in the range of 0.08-0.13, inclusive, producing an upper layer, the upper layer having a bottom surface in contact with the intermediate layer and an opposing top surface.