Patent ID: 7399356

Claim:
A method for preparing a film structure of a ferroelectric single crystal, which comprises the steps of: (a) forming a layer of a material having a perovskite crystal structure on a substrate as an electrode layer, the substrate being a ferroelectric single crystal substrate having an off-axed crystal structure or a silicon single crystal substrate having a metal oxide layer of perovskite crystal structure on the surface thereof, and (b) growing a layer of a ferroelectric single crystal on the electrode layer by a pulsed laser deposition (PLD) or metallorganic chemical vapor deposition (MOCVD) method, the ferroelectric single crystal being a material having the composition of formula (I): x (A) y (B) z (C)- p (P) n (N) (I) wherein, (A) is Pb(Mg 1/3 Nb 2/3 )O3 or Pb(Zn 1/3 Nb 2/3 )O 3 , (B) is PbTiO 3 , (C) is LiTaO 3 , (P) is a metal selected from the group consisting of Pt, Au, Ag, Pd and Rh, (N) is an oxide of a metal selected from the group consisting of Ni, Co, Fe, Sr, Sc, Ru, Cu and Cd, x is a number in the range of 0.65 to 0.98, y is a number in the range of 0.01 to 0.34, z is a number in the range of 0.01 to 0.1, and p and n are each independently a number in the range of 0.01 to 5.