Preferential polarization and its reversal in polycrystalline BiFeO3/La0.5Sr0.5CoO3 heterostructures

Choudhury, Pallabee; Parui, Jayanta; Chiniwar, Santosh; Krupanidhi, S. B.

doi:10.1016/j.ssc.2015.02.011

Cited by 4 publications

(2 citation statements)

References 25 publications

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“…Figures 4(a) and (b) show representative data from switching spectroscopy PFM (SS-PFM) on individual grains to study local dynamic switching [52]. The amplitude data in SS-PFM is proportional to the piezoelectric constant normal to the sample surface and the phase shows the polarization orientation.…”

Section: Resultsmentioning

confidence: 99%

External bias dependent dynamic terahertz propagation through BiFeO₃ film

et al. 2022

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Interactions of Terahertz radiations with matter can lead to the realization of functional devices related to sensing, high-speed communications, non-destructive testing (NDT), spectroscopy, etc. In spite of the versatile applications that THz can offer, progress in this field is still suffering due to the dearth of suitable responsive materials. In this context, we have experimentally investigated emerging multiferroic BiFeO3 film (~ 200 nm) employing Terahertz time-domain spectroscopy (THz-TDS) under vertically applied (THz propagation in the same direction) electric fields. Our experiments reveal dynamic modulation of THz amplitude (up to about 7% within 0.2 THz to 1 THz frequency range) because of the variation in electric field from 0 kV/cm to 600 kV/cm. Further, we have captured signatures of the hysteretic nature of polarization switching in BiFeO3 film through non-contact THz-TDS technique, similar trends are observed in SS-PFM (Switching Spectroscopy Piezoresponse Force Microscope) measurements. We postulate the modulation of THz transmissions to the alignment/switching of ferroelectric polarization domains (under applied electric fields) leading to the reduced THz scattering losses (hence, reduced refractive index) experienced in the BiFeO3 film. This work indicates ample opportunities in integrating nanoscale multiferroic material systems with THz photonics in order to incorporate dynamic functionalities to realize futuristic THz devices.

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Section: Resultsmentioning

confidence: 99%

External bias dependent dynamic terahertz propagation through BiFeO₃ film

et al. 2022

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“…Using piezoresponse force microscopy (PFM) technique, the authors conclude that defect formation at the grain boundaries is responsible for the pinning centers that inhibit domain wall motion implying an asymmetric polarization-switching. 16 Nonetheless, no study has been reported to date on xLa 0.5 Sr 0.5 CoO 3 -(1Àx)BiFeO 3 solid nanocomposite. BiFeO 3 is an auspicious single phase multiferroic compound.…”

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Ferromagnetic and multiferroic interfaces in granular perovskite composite xLa0.5Sr0.5CoO3-(1−x)BiFeO3

Lohr

López

Saleta

et al. 2016

Journal of Applied Physics

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Nanopowder of ferromagnetic La0.5Sr0.5CoO3 (LSCO) and multiferroic BiFeO3 (BFO) were synthesized by spray pyrolysis method. Different compositions of multiferroic xLSCO-(1−x)BFO composites were synthesized at 800 °C for 2 h. Scanning electron microscopy and energy dispersive spectroscopy elemental mapping were performed to study the morphology of composites. Ferri/ferromagnetic responses above TC (LSCO) are observed, which are associated with the interfaces LSCO/BFO. This interface presents a different behavior compared to the original perovskites, and the magnitude of the magnetization depends on x. Electrical DC conductivity as a function of temperature for LSCO nanopowder (x = 1) presents a different behavior than that reported in bulk material. For x = 1 and 0.9, the model by Glazman and Matveev [Zh. Eksp. Teor. Fiz. 94, 332 (1988)] is proposed to describe the electrical conductivity. On the other hand, x = 0, 0.1, and 0.5 present a variable range hopping behavior. Complex impedance spectroscopy as a function of frequency indicates a pure resistive behavior for x ≥ 0.5 compositions, while a complex resistive-capacitive behavior is observed for low x values (0, 0.1). In these samples, low values of magnetoelectric coupling were measured with an AC lock-in technique.

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Investigation of defects dependence of local piezoelectric response on Fe, La-modified (Pb,Sr)TiO3 thin films: A piezoresponse force microscopy study

Bastos

Longo

Chiquito

et al. 2018

Materials Chemistry and Physics

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h i g h l i g h t s g r a p h i c a l a b s t r a c t The Fe, La co-doping (Pb,Sr)TiO 3 films are fabricated by sol-gel like method. The defect dipoles can be reorient under an PFM tip-bias-induced electric field. The Fe, La co-doping (Pb,Sr)TiO 3 films behaved like ferroelectric at the nanoscale. a b s t r a c t In this study, undoped-(Pb,Sr)TiO 3 and Fe 3þ , La 3þ co-doped (Pb,Sr)TiO 3 thin films were investigated at the nanoscale level by piezoresponse force microscopy (PFM), in order to evaluate the impact of dopinginduced damages on the ferroelectric and piezoelectric properties. Detailed investigations with nanoscale resolution have revealed occurrence of abnormal domains in writing pattern under forward and reverse bias for (Pb,Sr,La)(Ti,Fe)O 3 thin films. Further piezoresponse hysteresis loop measurements show that fully switchable loops were observed under high voltage mediated by defect dipoles and by "ferroelectric-like" polar defects clusters. They have been discussed taking into account charged defect formation with both local changes in the dipole moment and local symmetry breaking effects. In addition, the domain writing and its retention behavior of the undoped-PST and (Pb,Sr,La)(Ti,Fe)O 3 thin films were investigated. Undoped-PST films exhibited better stability for both positive and negative domains for a relatively long time in comparison to that observed for (Pb,Sr,La)(Ti,Fe)O 3 films.

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Preferential polarization and its reversal in polycrystalline BiFeO3/La0.5Sr0.5CoO3 heterostructures

Cited by 4 publications

References 25 publications

External bias dependent dynamic terahertz propagation through BiFeO₃ film

External bias dependent dynamic terahertz propagation through BiFeO₃ film

Ferromagnetic and multiferroic interfaces in granular perovskite composite xLa0.5Sr0.5CoO3-(1−x)BiFeO3

Investigation of defects dependence of local piezoelectric response on Fe, La-modified (Pb,Sr)TiO3 thin films: A piezoresponse force microscopy study

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Preferential polarization and its reversal in polycrystalline BiFeO3/La0.5Sr0.5CoO3 heterostructures

Cited by 4 publications

References 25 publications

External bias dependent dynamic terahertz propagation through BiFeO3 film

External bias dependent dynamic terahertz propagation through BiFeO3 film

Ferromagnetic and multiferroic interfaces in granular perovskite composite xLa0.5Sr0.5CoO3-(1−x)BiFeO3

Investigation of defects dependence of local piezoelectric response on Fe, La-modified (Pb,Sr)TiO3 thin films: A piezoresponse force microscopy study

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External bias dependent dynamic terahertz propagation through BiFeO₃ film

External bias dependent dynamic terahertz propagation through BiFeO₃ film