Optical characterisation of BiFeO₃ epitaxial thin films grown by pulsed‐laser deposition

Abstract

Epitaxial thin films of bismuth ferrite, BiFeO3, were deposited by pulsed laser deposition (PLD) on SrTiO3 (100), Nb‐doped SrTiO3 (100) and DyScO3 (110) substrates. Ellipsometric spectra are obtained in the energy range 0.73‐9.5 eV by combining Variable Angle Spectroscopic Ellipsometry (VASE) and vacuum ultraviolet (VUV) ellipsometry with synchrotron radiation. The optical constants of BiFeO3 films were determined by analysing the ellipsometric spectra with a model that describes the optical response of a system consisting of air, film and substrate. The shift towards higher energies of the refractive index and extinction coefficient of the film deposited onto Nb‐doped SrTiO3 as compared with that deposited onto DyScO3 was attributed to a more compressive in‐plane epitaxial strain. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Structure, optical and magnetic properties of Bi 1−x Eu x FeO 3 films fabricated by pulsed laser deposition

“…The determined E g value of pure BFO is 2.717 ± 0.008 eV, which is in good agreement with that reported in Ref. [24]. And the band gap of other four BEFO x (x = 0.03, 0.05, 0.07, 0.10) films is 2.689 ± 0.009 eV, 2.623 ± 0.007 eV, 2.586 ± 0.008 eV and 2.567 ± 0.007 eV, respectively.…”

Anisotropic optical properties of rhombohedral and tetragonal thin filmBiFeO3phases

“…4, bottom panel). This is in agreement with previous reports for comparable R-phase samples [16][17][18] and corresponds to a redshift of around 390 meV with respect to BiFeO 3 on LaAlO 3 .…”

Raman spectra and dielectric function of BiCrO3: Experimental and first-principles studies

“…A similar procedure was also used for the characterization of the BiFeO 3 epitaxial thin films. 31,32 The fits are shown in Fig. 1(a) by continuous lines.…”