Tunable multiferroic and bistable/complementary resistive switching properties of dilutely Li-doped BiFeO₃ nanoparticles: an effect of aliovalent substitution

Abstract

We report a potential way to enhance and tune the multiferroic and resistive switching properties of BiFeO3 nanoparticles through dilute aliovalent Li(1+) doping (0.046 atomic percent) at the Fe(3+) sites of BiFeO3. The high purity of the samples and the extent of doping were confirmed by different physical characterizations. Enhanced multiferroic properties with a magnetic moment per Fe atom ≈ 0.12 μB and electric polarization ≈ 49 μC cm(-2) were observed in one of the Li(1+) doped samples. A phenomenological model has been proposed to support the observed magnetic behavior of the doped samples. From a potential application point of view, we further report on the doping concentration and polarization coercivity dependent highly stable resistive switching behavior (endurance cycles >10(3) and stability >10(6) s) of Li-doped BiFeO3 nanoparticles. The stable complementary resistive switching behavior (1 bit operation) for >50 cycles and under voltage pulse for 10(3) cycles in the doped BiFeO3 at a low operating bias is reported. Thus, dilute aliovalent Li(1+) doping enables tunability of the ferroic and resistive switching properties of BiFeO3and shows it to be a promising multiferroic material.

Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

“…From the DSC plot, we have found that the Neel temperature in BNFM sample is in the same range after co-doping of Nd and Mn compared to pure BFO (T N ¼ 643 K), it was reported that cationic substitution of BFO leads to important effect in transitions temperatures (T N , T C ) of BFO due to the chemical pressure exerted by dopants on BFO lattice. 52,65,66 We have also observed dielectric and phonon anomalies (described before) in a similar temperature range ($T N ), which strongly suggests magneto-dielectric coupling around this temperature.…”

High density array of multiferroic nanoislands in a large area

“…This phenomenon is observed when the sample size is smaller than the cycloidal length of 64 nm. [28][29][30][31][32] Since BFO nanoislands employed in this study have a diameter of 47 AE 10 nm and height of 15 AE 5 nm, net magnetization could exist. Also, the in-plane lattice parameter of the BFO nanoisland is highly strained by the STO:Nb substrate, as shown in XRD and HR-TEM data (lattice parameter of in-plane and out-of-plane is 3.91Å and 4.07Å, respectively).…”

Recent Advances in Memory Devices with Hybrid Materials

“…[73][74][75][76][77][78] Especially, to improve the memory properties such as ON/ OFF ratio and power consumption, hybrid-type devices which incorporate the nanoparticles in the polymer matrix have been investigated extensively. [73][74][75][76][77][78] Especially, to improve the memory properties such as ON/ OFF ratio and power consumption, hybrid-type devices which incorporate the nanoparticles in the polymer matrix have been investigated extensively.…”