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J. Compos. Sci.
Special Issues
Multiferroic Composite Structures
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Multiferroic Composite Structures

A special issue of Journal of Composites Science (ISSN 2504-477X). This special issue belongs to the section "Metal Composites".

Deadline for manuscript submissions: closed (31 July 2021) | Viewed by 6625

Special Issue Editors

Dr. Dhiren K. Pradhan

E-Mail Website
Guest Editor
1. Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996, USA
2. Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
Interests: ferroelectrics; magnetism; multiferroics; scanning probe microscopy; high energy density capacitor
Special Issues, Collections and Topics in MDPI journals
Dr. Shalini Kumari

E-Mail Website
Guest Editor
Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA
Interests: ferroelectrics; magnetism; multiferroics; quantum materials; molecular beam epitaxy

Special Issue Information

Dear Colleagues,

Multiferroic magnetoelectric (MF-ME) materials possess both ferroelectricity and magnetism and, therefore, the ability to control and switch the magnetization by electric fields and the polarization by magnetic fields, making them promising candidates for next-generation low-power nano(micro)scale electronic, spintronics, and memory devices. Due to mutual exclusiveness and natural chemical incompatibility between magnetism and ferroelectricity, few single-phase multiferroic materials exist in nature. Most of the single-phase materials exhibit either ferroelectric or magnetic transition temperatures below room temperature, and the ME coupling in these materials are found to be weak due to large independency of the magnetic and ferroelectric ordering temperature. Hence, the single-phase multiferroics discovered to date are not suitable for use in devices operating at room temperature. It is envisioned that strong ME coupling at room temperature for practical device applications can be achieved through the development of composite structures containing ferroelectric and ferro/ferrimagnetic materials in different architectures.

Dr. Dhiren K. Pradhan
Dr. Shalini Kumari
Guest Editors

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Keywords

  • Ferroelectric
  • Magnetism
  • Multiferroic
  • Composite

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Published Papers (3 papers)

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Research

18 pages, 9311 KiB  
Article
Multicaloric Effect in 0–3-Type MnAs/PMN–PT Composites
by Abdulkarim A. Amirov, Alexander S. Anokhin, Mikhail V. Talanov, Vladimir V. Sokolovskiy, Magzhan. K. Kutzhanov, Houbing Huang, Larisa A. Reznichenko, Andrey V. Es’kov and Akhmed M. Aliev
J. Compos. Sci. 2023, 7(9), 400; https://doi.org/10.3390/jcs7090400 - 20 Sep 2023
Cited by 1 | Viewed by 1410
Abstract
The new xMnAs/(1 − x)PMN–PT (x = 0.2, 0.3) multicaloric composites, consisting of the modified PMN–PT-based relaxor-type ferroelectric ceramics and ferromagnetic compound of MnAs were fabricated, and their structure, magnetic, dielectric properties, and caloric effects were studied. Both components of the multicaloric composite [...] Read more.
The new xMnAs/(1 − x)PMN–PT (x = 0.2, 0.3) multicaloric composites, consisting of the modified PMN–PT-based relaxor-type ferroelectric ceramics and ferromagnetic compound of MnAs were fabricated, and their structure, magnetic, dielectric properties, and caloric effects were studied. Both components of the multicaloric composite have phase transition temperatures around 315 K, and large electrocaloric (~0.27 K at 20 kV/cm) and magnetocaloric (~13 K at 5 T) effects around this temperature were observed. As expected, composite samples exhibit a decrease in magnetocaloric effect (<1.4 K at 4 T) in comparison with an initial MnAs magnetic component (6.7 K at 4 T), but some interesting phenomena associated with magnetoelectric interaction between ferromagnetic and ferroelectric components were observed. Thus, a composite with x = 0.2 exhibits a double maximum in isothermal magnetic entropy changes, while a composite with x = 0.3 demonstrates behavior more similar to MnAs. Based on the results of experiments, the model of the multicaloric effect in an MnAs/PMN–PT composite was developed and different scenario observations of multicaloric response were modeled. In the framework of the proposed model, it was shown that boosting of caloric effect could be achieved by (1) compilation of ferromagnetic and ferroelectric components with large caloric effects in selected mass ratio and phase transition temperature; and (2) choosing of magnetic and electric field coapplying protocol. The 0.3MnAs/0.7PMN–PT composite was concluded to be the optimal multicaloric composite and a phase shift ∆φ = −π/4 between applied manetic fields can provide a synergetic caloric effect at a working point of 316 K. Full article
(This article belongs to the Special Issue Multiferroic Composite Structures)
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13 pages, 24389 KiB  
Article
Investigation of the Phase Transitions and Magneto-Electric Response in the 0.9(PbFe0.5Nb0.5)O3-0.1Co0.6Zn0.4Fe1.7Mn0.3O4 Particulate Composite
by Krishnamayee Bhoi, Smaranika Dash, Sita Dugu, Dhiren K. Pradhan, Anil K. Singh, Prakash N. Vishwakarma, Ram S. Katiyar and Dillip K. Pradhan
J. Compos. Sci. 2021, 5(7), 165; https://doi.org/10.3390/jcs5070165 - 24 Jun 2021
Cited by 5 | Viewed by 2220
Abstract
Multiferroic composites with enhanced magneto-electric coefficient are suitable candidates for various multifunctional devices. Here, we chose a particulate composite, which is the combination of multiferroic (PbFe0.5Nb0.5O3, PFN) as matrix and magnetostrictive (Co0.6Zn0.4Fe1.7 [...] Read more.
Multiferroic composites with enhanced magneto-electric coefficient are suitable candidates for various multifunctional devices. Here, we chose a particulate composite, which is the combination of multiferroic (PbFe0.5Nb0.5O3, PFN) as matrix and magnetostrictive (Co0.6Zn0.4Fe1.7Mn0.3O4, CZFMO) material as the dispersive phase. The X-ray diffraction analysis confirmed the formation of the composite having both perovskite PFN and magnetostrictive CZFMO phases. The scanning electron micrograph (SEM) showed dispersion of the CZFMO phase in the matrix of the PFN phase. The temperature-dependent magnetization curves suggested the transition arising due to PFN and CZFMO phase. The temperature-dependent dielectric study revealed a second-order ferroelectric to the paraelectric phase transition of the PFN phase in the composite with a small change in the transition temperature as compared to pure PFN. The magnetocapacitance (MC%) and magnetoimpedance (MI%) values (obtained from the magneto-dielectric study at room temperature (RT)) at 10 kHz were found to be 0.18% and 0.17% respectively. The intrinsic magneto-electric coupling value for this composite was calculated to be 0.14 mVcm−1Oe−1, which is comparable to other typical multiferroic composites in bulk form. The composite PFN-CZFMO exhibited a converse magneto-electric effect with a change in remanent magnetization value of −58.34% after electrical poling of the material. The obtained outcomes from the present study may be utilized in the understanding and development of new technologies of this composite for spintronics applications. Full article
(This article belongs to the Special Issue Multiferroic Composite Structures)
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17 pages, 18991 KiB  
Article
Demagnetization Effect on the Magnetoelectric Response of Composite Multiferroic Cylinders
by Somer Nacy and George Youssef
J. Compos. Sci. 2021, 5(5), 139; https://doi.org/10.3390/jcs5050139 - 20 May 2021
Cited by 2 | Viewed by 1954
Abstract
Strain-mediated multiferroic composite structures are gaining scientific and technological attention because of the promise of low power consumption and greater flexibility in material and geometry choices. In this study, the direct magnetoelectric coupling coefficient (DME) of composite multiferroic cylinders, consisting of two mechanically [...] Read more.
Strain-mediated multiferroic composite structures are gaining scientific and technological attention because of the promise of low power consumption and greater flexibility in material and geometry choices. In this study, the direct magnetoelectric coupling coefficient (DME) of composite multiferroic cylinders, consisting of two mechanically bonded concentric cylinders, was analytically modeled under the influence of a radially emanating magnetic field. The analysis framework emphasized the effect of demagnetization on the overall performance. The demagnetization effect was thoroughly considered as a function of the imposed mechanical boundary conditions, the geometrical dimensions of the composite cylinder, and the introduction of a thin elastic layer at the interface between the inner piezomagnetic and outer piezoelectric cylinders. The results indicate that the demagnetization effect adversely impacted the DME coefficient. In a trial to compensate for the reduction in peak DME coefficient due to demagnetization, a non-dimensional geometrical analysis was carried out to identify the geometrical attributes corresponding to the maximum DME. It was observed that the peak DME coefficient was nearly unaffected by varying the inner radius of the composite cylinder, while it approached its maximum value when the thickness of the piezoelectric cylinder was almost 60% of the total thickness of the composite cylinder. The latter conclusion was true for all of the considered boundary conditions. Full article
(This article belongs to the Special Issue Multiferroic Composite Structures)
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