Epitaxial growth of (001)-oriented and (110)-oriented SrBi2Ta2O9 thin films

Abstract

Structural and electrical anisotropy of (001)-, (116)-, and (103)-oriented epitaxial SrBi 2 Ta 2 O 9 thin films on SrTiO 3 substrates grown by pulsed laser deposition Ex situ growth of the c-axis preferred oriented SrBi 2 Ta 2 O 9 thin films on Pt/Ti/SiO 2 /Si substrates J.Epitaxial SrBi 2 Ta 2 O 9 thin films have been grown with ͑001͒ and ͑110͒ orientations by pulsed laser deposition on ͑001͒ LaAlO 3 -Sr 2 AlTaO 6 and ͑100͒ LaSrAlO 4 substrates, respectively. Four-circle x-ray diffraction and transmission electron microscopy reveal nearly phase pure epitaxial films. Minimization of surface mesh mismatch between the film and substrate ͑i.e., choice of appropriate substrate material and orientation͒ was used to stabilize the desired orientations and achieve epitaxial growth.

Epitaxial growth of ferroelectric oxide films

“…Singlecrystals and single-crystalline layers epitaxially grown preferentially with a-axis orientation can overcome this problem [31]. However, the a-axis epitaxial deposition of thin layers is particularly difficult to achieve due to the layered structure and the lattice mismatch [46,47].…”

Nanoscopic switching behavior of epitaxial SrBi2Ta2O9 films deposited by pulsed laser deposition

“…Fully a-oriented SBT films on latticematched substrates have already been reported. 18 Although no ferroelectric measurements have been conducted as these films did not use bottom electrodes, it is expected that fully a-oriented Bi-layered films should have a much higher value of spontaneous polarization.…”

Thermodynamic theory of epitaxial ferroelectric thin films with dense domain structures

“…The twinning of epitaxial layers was predicted theoretically by Roitburd already in 1976, 1 and during the past decade domain patterns were found in PbTiO 3 , Pb(Zr x Ti 1-x )O 3 , (Pb 1-x La x )TiO 3 , BaTiO 3 , KNbO 3 , and SrBi 2 Ta 2 O 9 films grown on various singlecrystalline substrates. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] The experimental observations triggered intensive theoretical studies of the statics and dynamics of elastic domains (twins) in epitaxial ferroelectric and ferroelastic thin films. 1,[21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] In the general case, the problem is very complicated because of substantial inhomogeneity of internal mechanical stresses in polydomain (twinned) films.…”