Effect of bottom electrode and resistive layer on the dielectric and ferroelectric properties of sol–gel derived BiFeO3 thin films

Conduction mechanisms and enhanced multiferroic properties of Sr doped Bi0.85−xPr0.15SrxFe0.97Mn0.03O3 thin films

“…The leakage current densities of pure BFO and BPS x FMO (x = 0.02-0.05) thin films are 1.24 9 10 -4 , 1.81 9 10 -4 , 7.05 9 10 -4 , 1.40 9 10 -3 and 5.81 9 10 -4 A cm -2 at 150 kV cm -1 , respectively. In order to get more insight into transport behavior of carriers, the leakage conduction mechanisms of pure BFO and BPS x-FMO thin films are investigated, four possible leakage mechanisms have been discussed [20], including two kinds of bulk-limited conductions [space-charge-limited conduction (SCLC) and Poole-Frenkel (PF) emission] and two kinds of interface-limited conductions [Schottky …”

“…Figure 4e shows ln (J/E 2 ) versus 1/E curves of pure BFO and BPS x FMO thin films, which are used to identify the existence of FN tunneling. If the FN tunneling occurs in the films, the ln (J/E 2 ) versus 1/E plot should be linear with a negative slope [20]. Figure 4e shows that one negative slope of -128 ([120 kV cm -1 ) for the BFO film, one negative slope of -55 ([200 kV cm -1 ) for the BPS 2 FMO film, two slopes of -184 ([170 kV cm -1 ) and -75 (108-170 kV cm -1 ) for the BPS 3 FMO film, two slopes of -190 ([185 kV cm -1 ) and -46 (75-185 kV cm -1 ) for the BPS 4 FMO film, two slopes of -233 ([200 kV cm -1 ) and -58 (110-200 kV cm -1 ) for the BPS 5 FMO film are observed, which signify that FN tunneling governs the conduction behaviors of all the films in the relatively high applied field.…”

Structure, ferroelectric/magnetoelectric properties and leakage current density of (Bi0.85Nd0.15)FeO3 thin films

“…Both ferroelectricity and antiferromagnetism have long been known in BiFeO 3 single crystals [15][16][17][18]. Recently, several experimental papers reported the existence of a large ferroelectric polarization as well as a small magnetization in doped BiFeO 3 [19][20][21]. However, one of the major drawbacks related to BiFeO 3 is its high leakage current density.…”

Conduction mechanisms and enhanced multiferroic properties of 2-2 type Bi0.89Sm0.11FeO3–NiFe2O4 composition thin films

“…3(e). It is clearly seen that the ln(J/E 2 ) vs 1/E plot of the BFO-NFO and BSFO-NFO thin films both show a straight line with a negative slope in a high applied electric field [24]. One negative slope is s¼ À236.6 for the BFO-NFO thin film, another negative slope is s¼ À183.0 for the BSFO-NFO thin film, suggesting that the leakage current of the two films follows the interfacelimited F-N tunneling mechanism according to equation (Eq.…”