Effect of Ba substitution on the multiferroic properties of BiFeO3 films on glass substrates

Abstract

Texture control of multiferroic BiFeO3 polycrystalline films on glass substrates with various metal electrode underlayers Enhanced ferroelectric and ferromagnetic properties in lead-free multilayer composite films based on ferroelectric (Bi0.5Na0.5)0.945Ba0.055TiO3 and multiferroic BiFeO3 J. Appl. Phys. 117, 064105 (2015); 10.1063/1.4908069 0.7BiFeO3-0.3BaTiO3-Y3Fe5O12 composites with simultaneously improved electrical and magnetic properties Effect of Ba substitution on the multiferroic properties of non-epitaxially grown polycrystalline Bi 1Àx Ba x FeO 3 (BBFO) films on refined Pt(111) electrode buffered glass substrates is studied. The structural analysis shows that a pure perovskite phase is present for BBFO films (x ¼ 0.05-0.15), and (110) preferred orientation is developed for films with high x ¼ 0.15. The grain size and surface roughness are reduced with increasing x. All studied BBFO films show desired ferroelectric and ferromagnetic properties. The good ferroelectric properties with the remanent polarization (2P r ) of 36-70 lC/cm 2 and electrical coercive field (E c ) of 318-570 kV/cm are attained. On the other hand, the substitution of Ba 2þ for Bi 3þ in the A site of the BFO crystal structure can effectively enhance the ferromagnetic properties with magnetization (M s ) of 9.4-13.9 emu/cm 3 and coercivity (H c ) of 1216-1380 Oe. The ferromagnetic and ferroelectric properties and leakage behavior as functions of Ba content x are discussed. V C 2015 AIP Publishing LLC.

Multiferroic properties of (Bi, Ca)FeO 3 films on glass substrates

“…Due to dense microstructure, these values are superior to BCFO ceramics [14][15][16]. The enhancement of magnetic properties could be associated with distortion of the Fe O Fe bond angle due to Cadoping, which directly affects the Fe O Fe exchanging pathway [11][12][13][14][15]. …”

“…Fig. 6 depicts M-H curves of Bi 1−x Ca x FeO 3 films grown on 20-nm-thick Pt buffered glass substrates at 450 • C. All studied BCFO films exhibit a ferromagnetic behavior due to the suppressed spiral spin configuration of AFM in BFO by a substitution of Ca 2+ [11][12][13][14][15]. With the increase of Ca content, both saturation magnetization and coercivity are monotonically increased from 5.9 emu/cm 3 and 1224 Oe for x = 0.05 to 8.2 emu/cm 3 and 1258 Oe for x = 0.15, respectively.…”

“…The substitution of different valence elements for Bi in BFO provskite phase is a pronounced effective way to control various physical properties [10][11][12][13][14][15][16][17][18][19][20][21][22]. The magnetization enhancement was found in A-doped BFO ceramics and films (A = Ca, Sr, Ba, La, and Pb) due to the suppressed spiral spin configuration of antiferromagnetic BFO by a substitution of A [10][11][12][13][14][15][16].…”

“…The magnetization enhancement was found in A-doped BFO ceramics and films (A = Ca, Sr, Ba, La, and Pb) due to the suppressed spiral spin configuration of antiferromagnetic BFO by a substitution of A [10][11][12][13][14][15][16]. Among the BFO ceramics with various substituents, Bi 1−x Ca x FeO 3 (BCFO) was reported showing interesting structural, magnetic, and electrical evolutions and a significant photovoltaic effect [15][16][17][18][19][20][21][22].…”

Structural, Ferroelectric and Ferromagnetic Properties of Single-Phase Bi0.95Ba0.05FeO3 Thin Film Prepared by Pulsed Laser Deposition

“…The epitaxial BFO thin films exhibited large remanent polarization P r (50-150 μC cm −2 ) and large coercive field E c (100-250 kV cm −1 ) [1,11]. Substitutions of partial Bi 3+ at A-sites with Pr 4+ , Ce 3+ , Er 4+ , and Ba 2+ ions have been proved to be a good way to improve the magnetic properties of BFO films [12][13][14][15][16][17][18]. Among them, Ba 2+ ions are shown to be the best substitution for enhancing saturation magnetization.…”