Growth, structure, and properties of BiFeO3/-BiCrO3 films obtained by dual cross beam PLD.
The properties of epitaxial Bi(2)FeCrO(6) thin films, recently synthesized by pulsed laser deposition, have partially confirmed the theoretical predictions (i.e., a magnetic moment of 2 micro(B) per formula unit and a polarization of approximately 80 microC/cm(2) at 0 K). The existence of magnetic ordering at room temperature for this material is an unexpected, but very promising, result that needs to be further investigated. Because magnetism is assumed to arise from the exchange interaction between the Fe and Cr cations, the magnetic behavior is strongly dependent on both their ordering and the distance between them. We present here the successful synthesis of epitaxial Bi(2)Fe(x)CryO(6) (BFCO x/y) films grown on SrTiO3 substrates using dual crossed-beam, pulsed-laser deposition. The crystal structure of the films has different types of (111)-oriented superstructures, depending on the deposition conditions. The multiferroic character of BFCO (x/y) films is proven by the presence of both ferroelectric and magnetic hysteresis at room temperature. The oxidation state of Fe and Cr ions in the films is shown to be 3+ only, and the difference in macroscopic magnetization with Fe/Cr ratio composition could only be due to ordering of the Cr(3+) and Fe(3+) cations to the modification of the exchange interaction between them.
Nechache
Riad
R
Institut National de la Recherche Scientifique - Energie, Materiaux et Télécommunications, Boulevard Lionel-Boulet, Varennes (Montreal Metropolitan Area), Québec, J3X 1S2, Canada.
Harnagea
Catalin
C
Gunawan
Lina
L
Carignan
Louis-Philipe
LP
Maunders
Christian
C
Ménard
David
D
Botton
Gianluigi A
GA
Pignolet
Alain
A
D001729:Bismuth / Q000737:chemistry*; D003461:Crystallography / Q000379:methods*; D017097:Electric Impedance; D008422:Materials Testing; D008567:Membranes, Artificial; D008968:Molecular Conformation; D010087:Oxides / Q000737:chemistry; D012996:Solutions
D008567:Membranes, Artificial; D010087:Oxides; D012996:Solutions; D001729:Bismuth