Studies of Phase Transitions and Magnetoelectric Coupling in PFN-CZFO Multiferroic Composites

Pradhan, Dhiren K.; Puli, Venkata Sreenivas; Kumari, Shalini; Sahoo, Satyaprakash; Das, Proloy T.; Pradhan, Kallol; Pradhan, Dillip K.; Scott, J. F.; Katiyar, Ram S.

doi:10.1021/acs.jpcc.5b10422

Cited by 75 publications

(55 citation statements)

References 44 publications

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“…19,20,21,22,23 Due to the natural chemical incompatibility between magnetism and ferroelectricity in oxide perovskites, only a few single-phase multiferroic oxides exist with sufficiently large magnitude of polarization and magnetization for real device applications. Some of the well-known potential multiferroic materials are as follows: BiFeO3, YMnO3, Pb(Fe0.5Nb0.5)O3, Pb(Fe0.5Ta0.5)O3, Pb(Fe0.67W0.33)O3, TbMnO3, etc.…”

Section: +2mentioning

confidence: 99%

Palladium-based ferroelectrics and multiferroics: Theory and experiment

et al. 2017

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Palladium normally does not easily substitute for Ti or Zr in perovskite oxides. Moreover, Pd is not normally magnetic (but becomes ferromagnetic under applied uniaxial stress or electric fields). Despite these two great obstacles, we have succeeded in fabricating lead zirconate titanate with 30% Pd substitution. For 20:80 Zr:Ti the ceramics are generally single-phase perovskite (>99%), but sometimes exhibit 1% PbPdO2, which is magnetic below T=90K. The resulting material is multiferroic (ferroelectric-ferromagnet) at room temperature. The processing is slightly unusual (>8 hrs in high-energy ball-milling in Zr balls), and the density functional theory provided shows that it occurs because of Pd +4 in the oversized Pb +2 site; if all Pd +4 were to go into the Ti +4 perovskite B-site, no magnetism would result.

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Section: +2mentioning

confidence: 99%

Palladium-based ferroelectrics and multiferroics: Theory and experiment

et al. 2017

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“…4183 Å from the refinement, which matches well with previous reports. 19,20 Using the obtained unit cell parameters and atomic positions, a three-dimensional sketch of the CZFO unit cell projected along the c-axis is shown in Figure 1 Here R and IR represent Raman and Infrared active modes respectively.…”

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Correlation of dielectric, electrical and magnetic properties near the magnetic phase transition temperature of cobalt zinc ferrite

Pradhan

Kumari

Puli

et al. 2017

Phys. Chem. Chem. Phys.

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Multiferroic composite structures, i.e., composites of magnetostrictive and piezoelectric materials can be envisioned towards the goal of achieving strong room-temperature ME coupling for real practical device applications. Magnetic materials with high magnetostriction, high Néel temperature (TN), high resistivity and large magnetization are required to observe high ME coupling in composite structures. In continuation to our investigations for suitable magnetic candidate for multiferroic composite structures, we have studied the crystal structure, dielectric, transport, and magnetic properties of Co0.65Zn0.35Fe2O4 (CZFO). Rietveld refinement of X-ray diffraction patterns confirms the phase purity with cubic crystal structure with (Fd 3 m) space group; however, we have found a surprisingly large magnto-dielectric anomaly at the Neel temperature, unexpected for a cubic structure. The presence of mixed valences of Fe +2 /Fe +3 cations is probed by X-ray photon spectroscopy (XPS), which support the catonic ordering-mediated large dielectric response.Large dielectric permittivity dispersion with a broad anomaly is observed in the vicinity of the magnetic phase transition temperature (TN) of CZFO suggest the strong correlation 2 between dielectric and magnetic properties. The ferromagnetic-paramagnetic phase transition of CZFO has been found ~640 K, which is well above room temperature. CZFO exhibits low loss tangent, high dielectric constant and large magnetization with soft magnetic behavior above room temperature. We describe the possible potential candidates for multiferroic composite structures as well as for multifunctional and spintronics device applications.

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“…The obvious choice for a high figure of merit ME nanostructure is a multilayer structure with an atomically smooth interface between the magnetic and ferroelectric layers. Magnetic materials with high magnetostriction, high Curie temperature (T c ), and large magnetization, as well as ferroelectric materials with large polarization, dielectric constant and piezoelectric coefficients, are required to produce strong ME coupling in the heterostructures 8,9,11 . Achieving a large ME coupling in thin films with important implications for device applications is a long-standing scientific challenge 2,7–9 .…”

Section: Introductionmentioning

confidence: 99%

“…The ME coupling may arise due to coupling between electrical and magnetic order parameters or due to cross coupling between magneto- and electro-striction and magnetic order parameters or indirectly via lattice strain and interfacial electronic reconstruction (charge coupling) 2,8,9 . For composites, the ME effect is a product tensor property of the piezoelectric and piezomagnetic coefficient that results from the cross interaction between the two phases 9–11 .…”

Section: Introductionmentioning

confidence: 99%

“…Several theoretical and experimental investigations have been reported that achieve large ME coupling for various composite bulk and thin film structures 11,13–22 . Strong ME coupling has been observed in different layered composite structures such as: trilayers of BaTiO 3 /BiFeO 3 /BaTiO 3 , bilayers of PbZr 0.57 Ti 0.43 O 3 /NiFe 2 O 4 , bilayers and superlattices of Ba 0.7 Sr 0.3 TiO 3 /La 0.7 Sr 0.3 MnO 3 , PbZr 0.2 Ti 0.8 O 3 /La 0.8 Sr 0.2 MnO 3 heterostructures, PbZr 0.57 Ti 0.43 O 3 /CoFe 2 O 4 bilayer and multilayers and BaTiO 3 /CoFe 2 O 4 multilayer heterostructures 8,9,13,23,24 .…”

Section: Introductionmentioning

confidence: 99%

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Exploring the Magnetoelectric Coupling at the Composite Interfaces of FE/FM/FE Heterostructures

Pradhan

Kumari

Vasudevan

et al. 2018

Sci Rep

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Multiferroic materials have attracted considerable attention as possible candidates for a wide variety of future microelectronic and memory devices, although robust magnetoelectric (ME) coupling between electric and magnetic orders at room temperature still remains difficult to achieve. In order to obtain robust ME coupling at room temperature, we studied the Pb(Fe0.5Nb0.5)O3/Ni0.65Zn0.35Fe2O4/Pb(Fe0.5Nb0.5)O3 (PFN/NZFO/PFN) trilayer structure as a representative FE/FM/FE system. We report the ferroelectric, magnetic and ME properties of PFN/NZFO/PFN trilayer nanoscale heterostructure having dimensions 70/20/70 nm, at room temperature. The presence of only (00l) reflection of PFN and NZFO in the X-ray diffraction (XRD) patterns and electron diffraction patterns in Transmission Electron Microscopy (TEM) confirm the epitaxial growth of multilayer heterostructure. The distribution of the ferroelectric loop area in a wide area has been studied, suggesting that spatial variability of ferroelectric switching behavior is low, and film growth is of high quality. The ferroelectric and magnetic phase transitions of these heterostructures have been found at ~575 K and ~650 K, respectively which are well above room temperature. These nanostructures exhibit low loss tangent, large saturation polarization (Ps ~ 38 µC/cm2) and magnetization (Ms ~ 48 emu/cm3) with strong ME coupling at room temperature revealing them as potential candidates for nanoscale multifunctional and spintronics device applications.

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Studies of Phase Transitions and Magnetoelectric Coupling in PFN-CZFO Multiferroic Composites

Cited by 75 publications

References 44 publications

Palladium-based ferroelectrics and multiferroics: Theory and experiment

Palladium-based ferroelectrics and multiferroics: Theory and experiment

Correlation of dielectric, electrical and magnetic properties near the magnetic phase transition temperature of cobalt zinc ferrite

Exploring the Magnetoelectric Coupling at the Composite Interfaces of FE/FM/FE Heterostructures

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