Critical phase transition temperatures of 1–3 type multiferroic composite thin films

Lu, Xiao Yan; Wang, Biao; Zheng, Yue; Ryba, E.

doi:10.1088/0022-3727/40/6/004

Cited by 14 publications

(10 citation statements)

References 25 publications

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“…As in composite structures, ferroelectric and magnetic order parameters are coupled, so both ferroelectric and magnetic properties are affected by the increase/decrease of ferroelectric and magnetic material content. This type of behavior, i.e., the increase of ferroelectric T c with increase of magnetic content has also been theoretically predicted for multiferroic composite thin films 45 . For these heterostructures, the increase of ferroelectric Tc shifts towards higher temperature compared to pure PFN may be explained due to the effective misfit strain and ME coupling.…”

Section: Resultssupporting

confidence: 67%

“…It is also reported that the development of strain, deforms the crystal in the perpendicular direction which provides space for ionic displacement of B site atoms, hence the T c is expected to be modified 48 . In composite structures, the effective misfit strain on ferroelectric material is mechanically transmitted to the magnetic materials through the magnetostrictive effect inducing a change in the magnetic order parameters and T c 45 . Another interesting observation is that another anomaly at ~645 K at 100 kHz begins to develop and becomes prominent as the frequency increases; this is near the magnetic phase transition of the heterostructure.…”

Section: Resultsmentioning

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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Section: Resultssupporting

confidence: 67%

Section: Resultsmentioning

confidence: 99%

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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“…This behavior, i.e., the increase of ferroelectric T c with increase of magnetic content has been theoretically predicted for 1-3 type multiferroic composite thin films. 40 All the measured thin films exhibit a diffuse (broadening) type of phase transition behavior.…”

Section: Resultsmentioning

confidence: 95%

Reconstructing phase diagrams from local measurements via Gaussian processes: mapping the temperature-composition space to confidence

et al. 2018

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We show the ability to map the phase diagram of a relaxor-ferroelectric system as a function of temperature and composition through local hysteresis curve acquisition, with the voltage spectroscopy data being used as a proxy for the (unknown) microscopic state or thermodynamic parameters of materials. Given the discrete nature of the measurement points, we use Gaussian processes to reconstruct hysteresis loops in temperature and voltage space, and compare the results with the raw data and bulk dielectric spectroscopy measurements. The results indicate that the surface transition temperature is similar for all but one composition with respect to the bulk. Through clustering algorithms, we recreate the main features of the bulk diagram, and provide statistical confidence estimates for the reconstructed phase transition temperatures. We validate the method by using Gaussian processes to predict hysteresis loops for a given temperature for a composition unseen by the algorithm, and compare with measurements. These techniques can be used to map phase diagrams from functional materials in an automated fashion, and provide a method for uncertainty quantification and model selection.

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“…The possible composite architecture depending on the connectivity are: 0-0, 0-1, 1-1, 2-1, 3-1, 3-2, 3-3, 0-2, 1-2, 2-2, and some hybrid architectures, where the number implies the dimension of the magnetic and ferroelectric components, respectively [ 32 , 46 ]. The most commonly used ME architectures with successfully proven enhanced physical properties are: 0-3 particulate composites (where the magnetic nanoparticles (0-dimensional) are dispersed in ferroelectric matrices (three-dimensional)), 1-3 rod composites (where one-dimensional rods are grown in three-dimensional ferroelectric matrix), and 2-2 layered composites (where two-dimensional magnetic thick/thin layers are grown on two-dimensional ferroelectric thin films, and the periodicity might more than one) [ 17 , 32 , 46 , 47 , 48 , 49 ]. Figure 2 shows the 0-3, 1-3, and 2-2 composite nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Magnetoelectric Composites: Applications, Coupling Mechanisms, and Future Directions

2020

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Multiferroic (MF)-magnetoelectric (ME) composites, which integrate magnetic and ferroelectric materials, exhibit a higher operational temperature (above room temperature) and superior (several orders of magnitude) ME coupling when compared to single-phase multiferroic materials. Room temperature control and the switching of magnetic properties via an electric field and electrical properties by a magnetic field has motivated research towards the goal of realizing ultralow power and multifunctional nano (micro) electronic devices. Here, some of the leading applications for magnetoelectric composites are reviewed, and the mechanisms and nature of ME coupling in artificial composite systems are discussed. Ways to enhance the ME coupling and other physical properties are also demonstrated. Finally, emphasis is given to the important open questions and future directions in this field, where new breakthroughs could have a significant impact in transforming scientific discoveries to practical device applications, which can be well-controlled both magnetically and electrically.

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Critical phase transition temperatures of 1–3 type multiferroic composite thin films

Cited by 14 publications

References 25 publications

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

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

Reconstructing phase diagrams from local measurements via Gaussian processes: mapping the temperature-composition space to confidence

Magnetoelectric Composites: Applications, Coupling Mechanisms, and Future Directions

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