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Ferromagnetic and Ferroelectric Materials: Synthesis, Applications, and Techniques (Second Edition)

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Special Issue Information

Dear Colleagues,

Ferroelectric and ferromagnetic materials remain hot research topics for condensed matter physics and material science, since they are an attractive realm for developing devices with enhanced functionality based on either their bulk or surface and interface properties. The application prospects in the field of nonvolatile memories, sensors, piezoelectric devices, photovoltaic applications, catalysis, and photocatalysis define new challenges. Such challenges range from defining appropriate models to understand the fundamental mechanisms, which further define their functionality, to analysis methods and investigation techniques, allowing for the isolation of the relevant contributions of these mechanisms to device performance.

The aim of this Special Issue, “Ferromagnetic and Ferroelectric Materials: Synthesis, Applications, and Techniques”, is to provide updated information regarding novel preparation techniques of ferroelectric and ferromagnetic systems and to understand the physics of ferroelectric and ferromagnetic surfaces in conjunction with emerging theoretical models. Another purpose is to explore the relationship between charge transfer and screening, compensation mechanisms, interface band alignment, and spin ground state and the ferroelectric as well as ferromagnetic order. We will discuss theoretical and experimental aspects of different mechanisms and disclose their impacts on device functionality. We will focus on the challenges involving material modeling, process engineering, and application in conventional and organic–inorganic multiferroic systems. Theoretical perspectives, together with novel preparation and investigation approaches of one-, two-, and three-dimensional ferroic materials, including powders, thin films, heterostructures, ceramics, and composites, are welcomed.

Dr. Dana Popescu
Guest Editor

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Published Papers (1 paper)

Research

11 pages, 376 KiB

Open AccessArticle

Theoretical Study of Electric, Dielectric, and Optical Properties in Ion Doped Multiferroic SrFe₁₂O₁₉ Nanoparticles

by Angel T. Apostolov, Iliana N. Apostolova and Julia Mihailowa Wesselinowa

Materials 2024, 17(7), 1544; https://doi.org/10.3390/ma17071544 - 28 Mar 2024

Viewed by 397

Abstract

Electric, dielectric, and optical (band gap) properties of pure multiferroic as well as La- and Ni-doped

{SrFe}_{12}

O_{19}

(SFO) (at different sites) are investigated using a microscopic model and Green’s function technique. The concentration dependence of the polarization P is considered [...] Read more.

Electric, dielectric, and optical (band gap) properties of pure multiferroic as well as La- and Ni-doped

{SrFe}_{12}

O_{19}

(SFO) (at different sites) are investigated using a microscopic model and Green’s function technique. The concentration dependence of the polarization P is considered for substitution of rare earths ions on the Sr sites. For a small La ion doping concentration, x = 0.1, La-doped SFO is ferroelectric, whereas for a larger doping concentration, for example x = 0.5, it is antiferroelectric. The real part of the dielectric constant

ϵ

increases with an increasing magnetic field h.

ϵ

decreases with an increasing frequency and La dopants. Therefore, La-doped SFO is suitable for microwave application with a low dielectric constant. The magnetic properties of pure SFO NPs are also studied. Ni doping at the Fe site of SFO leads to enhanced ferroelectric polarization and dielectric constant. The band gap decreases or increases by substitution of Ni or In ions on the Fe site, respectively. The results reveal that the tuned band gap of Ni-doped SFO makes it a crucial candidate for optoelectronic and solid oxide fuel cell applications. Full article

(This article belongs to the Special Issue Ferromagnetic and Ferroelectric Materials: Synthesis, Applications, and Techniques (Second Edition))

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