Study on pure and Nd-doped BiFeO3 thin films prepared by chemical solution deposition method

Improved multiferroic properties in (1−x)BiFeO3–xBaTi0.95(Yb0.5Nb0.5)0.05O3 system (0≤x≤0.3)

“…Compared to undoped BiFeO 3 , tetragonal symmetry of compositions x = 0.1, 0.2 and 0.3 is confirmed by the emergence of three doubled peaks (110) (104); (202) (006) and at 32° and 39° in 2θ(Fig.1 (b)and (c)), respectively of each one into one peak. A similar type of phase transition was reported[22][23][24].…”

“… the modulation of spin spiral structure [19,[47][48][49]  the effect of grain size [50][51][52]: with dimension less than 62 nm, the probable modification of cycloid spin structure of BiFeO 3 can lead to weak ferromagnetism, and  the presence of Fe 2+ ions probably leading to a double-exchange interaction between Fe 3+ and Fe 2+ (Fe 3+ -O-Fe 2+ ) influenced magnetization [17,23] Compared to these works, in our system, the enhancement of ferromagnetic properties of BiFeO 3 as a results of doping non-magnetic Ba 2+ and Yb 3+ /Nb 5+/ Ti 4+ in A and B sites, respectively, could be attributed to the contribution of the above mentioned factors.…”

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

“…The saturated magnetization (M s ), remanent magnetization (M r ), and coercive field (H c ) of BBFO film is measured to be 36.76 emu cm −3 , 24.45 emu cm −3 , and 2998 Oe, respectively. These values are larger than those reported for doped BFO compounds [23][24][25][26], indicating that the magnetization of the films is remarkably enhanced by the substitutions of Bi 3+ ions for Ba 2+ ions. In order to investigate the nature of ferromagnetism in BBFO film, zero-field-cooled (ZFC) and field-cooled (FC) magnetization were also measured at a 200-Oe external field in the temperature range of 5 to 330 K, as shown in Fig.…”

Effect of Nd substitution for Ca on crystal structure, optical and magnetic properties of multiferroic Bi0.9Ca0.1FeO3

“…By fitting the peaks of the valence state of Fe ions, the ratios of Fe 3+ and Fe 2+ in the Bi 0.9 Ca 0.1 FeO 3 , Bi 0.9 Ca 0.07 Nd 0.03 FeO 3 and Bi 0.9 Ca 0.03 Nd 0.07 FeO 3 nanoparticals are calculated to be 1:0.48, 1:1.08 and 1:1.13, respectively. The case that the concentration ratios of Fe 2+ to Fe 3+ bigger than one was also appear in another research [31]. The origin of Fe 2+ ions might be associated with the valance fluctuation of Bi and/or presence of oxygen vacancy.…”