Anomalous ferroelectric switching dynamics in single crystalline SrTiO3

Shukla, Vinay Kumar; Mukhopadhyay, Soumik

doi:10.1063/1.4964943

Cited by 3 publications

(2 citation statements)

References 48 publications

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“…Among these, the Fe-doped SrTiO 3 has been proven to be a ferromagnetic [13] with resistive switching characteristics [14], and can also be used as electrode materials [15]. Such characteristics inspire us to investigate the possible multiferroic properties of the Fe-doped SrTiO 3 , which may have potential applications in memory devices, sensors, and actuators [16,17]. Owing to the obtained ferromagnetic property in the Fe-doped SrTiO 3 [13,18,19,20], and the excellent dielectric properties of SrTiO 3 , the study of the ferroelectric properties will play a significant role on the multiferroic application of the SrTi 1− x Fe x O 3 .…”

Section: Introductionmentioning

confidence: 99%

Room Temperature Tunable Multiferroic Properties in Sol-Gel-Derived Nanocrystalline Sr(Ti1−xFex)O3−δ Thin Films

et al. 2017

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Sr(Ti1−xFex)O3−δ (0 ≤ x ≤ 0.2) thin films were grown on Si(100) substrates with LaNiO3 buffer-layer by a sol-gel process. Influence of Fe substitution concentration on the structural, ferroelectric, and magnetic properties, as well as the leakage current behaviors of the Sr(Ti1−xFex)O3−δ thin films, were investigated by using the X-ray diffractometer (XRD), atomic force microscopy (AFM), the ferroelectric test system, and the vibrating sample magnetometer (VSM). After substituting a small amount of Ti ion with Fe, highly enhanced ferroelectric properties were obtained successfully in SrTi0.9Ti0.1O3−δ thin films, with a double remanent polarization (2Pr) of 1.56, 1.95, and 9.14 μC·cm−2, respectively, for the samples were annealed in air, oxygen, and nitrogen atmospheres. The leakage current densities of the Fe-doped SrTiO3 thin films are about 10−6–10−5 A·cm−2 at an applied electric field of 100 kV·cm−1, and the conduction mechanism of the thin film capacitors with various Fe concentrations has been analyzed. The ferromagnetic properties of the Sr(Ti1−xFex)O3−δ thin films have been investigated, which can be correlated to the mixed valence ions and the effects of the grain boundary. The present results revealed the multiferroic nature of the Sr(Ti1−xFex)O3−δ thin films. The effect of the annealing environment on the room temperature magnetic and ferroelectric properties of Sr(Ti0.9Fe0.1)O3−δ thin films were also discussed in detail.

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Section: Introductionmentioning

confidence: 99%

Room Temperature Tunable Multiferroic Properties in Sol-Gel-Derived Nanocrystalline Sr(Ti1−xFex)O3−δ Thin Films

et al. 2017

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“…As a consequence of broken inversion symmetry, ferroelectric insulators exhibit spontaneous polarization that responds nonlinearly to external stress or electric fields. Ferroelectric polar order in perovskite oxide films gets suppressed or changes to inhomogeneously polarized states with diminishing film thickness, making ferroelectricity in ultrathin films fundamentally interesting [1][2][3][4][5]. Recent development of a number of 2D materials has opened up new paradigm to address fundamental size limits on ferroelectricity.…”

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confidence: 99%

Prediction of Coupled Electronic and Phononic Ferroelectricity in Strained 2D h-NbN: First-Principles Theoretical Analysis

Chanana

Waghmare

2019

Phys. Rev. Lett.

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Using first-principles density functional theoretical analysis, we predict coexisting ferroelectric and semi-metallic states in two-dimensional monolayer of h-NbN subjected to electric field and in-plane strain ( ). At strains close to =4.85%, where its out-of-plane spontaneous polarization changes sign without inverting the structure, we demonstrate a hysteretic response of its structure and polarization to electric field, and uncover a three-state (P=±Po, 0) switching during which h-NbN passes through Dirac semi-metallic states. With first-principles evidence for a combination of electronic and phononic ferroelectricity, we present a simple model that captures the energetics of coupled electronic and structural polarization, and show that electronic ferroelectricity arises in a material which is highly polarizable (small bandgap) and exhibits a large electron-phonon coupling leading to anomalous dynamical charges. These insights will guide search for electronic ferroelectrics, and our results on 2D h-NbN will stimulate development of piezo-field effect transistors and devices based on the multi-level logic.

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Linear and nonlinear dielectric response of the first-order ferroelectric phase transition in K0.92Li0.08TaO3 under dc electric field

Трыбула

Łoś

Miga

et al. 2018

Materials Chemistry and Physics

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Anomalous ferroelectric switching dynamics in single crystalline SrTiO3

Cited by 3 publications

References 48 publications

Room Temperature Tunable Multiferroic Properties in Sol-Gel-Derived Nanocrystalline Sr(Ti1−xFex)O3−δ Thin Films

Room Temperature Tunable Multiferroic Properties in Sol-Gel-Derived Nanocrystalline Sr(Ti1−xFex)O3−δ Thin Films

Prediction of Coupled Electronic and Phononic Ferroelectricity in Strained 2D h-NbN: First-Principles Theoretical Analysis

Linear and nonlinear dielectric response of the first-order ferroelectric phase transition in K0.92Li0.08TaO3 under dc electric field

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