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Structures, Properties and Functionalities in Multiferroic Materials

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A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced and Functional Ceramics and Glasses".

Deadline for manuscript submissions: closed (10 November 2023) | Viewed by 7135

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Special Issue Editors

Dr. Liwei Geng

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Guest Editor

Department of Materials Science and Engineering, Sichuan University – Pittsburgh Institute, Chengdu 610200, China
Interests: magnetoelectrics; multiferroics; domain and domain walls; spintronics; phase-field modeling; micromagnetic simulation; first-principles calculation

Prof. Dr. Yongke Yan

E-Mail Website
Guest Editor

School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China
Interests: piezoelectric materials and devices; tunable electronic components; magnetoelectric composites and low-temperature co-fired ceramics

Special Issue Information

Dear Colleagues,

As a special class of materials, multiferroics exhibit more than one of the primary ferroic properties in the same phase, such as ferroelectricity, ferromagnetism, and ferroelasticity. Since the first appearance of the word “multiferroics” in the year 2000, great progress has been made in fundamental and application investigations of multiferroic materials. The interplay between different ferroic properties has provided access to promises of unprecedented functionalities in order to create novel electronic or spintronic devices.

This issue of Materials aims to highlight and summarize recent advances in structures, properties, and functionalities in multiferroic materials. Theoretical, computational, and experimental contributions to the following areas are welcome:

Ferroelectricity (dielectric, piezoelectric, pyroelectric materials and devices, ferroelectric domain structures, ferroelectric phase transition, phase-field simulation, first-principles computation, etc.);
Ferromagnetism or antiferromagnetism (spintronics, domain-wall-based devices, spin-orbit coupling, spin transfer, current-induced domain wall motion, domain engineering, giant magnetostriction, nano-dot, atomic devices, micromagnetic simulation, spin dynamics, etc.);
Magnetoelectric (single phase, magnetoelectric composites, interface, bias exchange, direct and converse ME coupling, magnetoelectric voltage tunable inductor, superexchange, flexomagnetoelectric effect, etc.).

Dr. Liwei Geng
Prof. Dr. Yongke Yan
Guest Editors

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Keywords

multiferroics
ferroelectricity
ferromagnetism
magnetoelectrics
spintronics
domain and domain wall
polarization and magnetiziation
phase-field modeling
material synthesis and characterization

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Published Papers (4 papers)

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Research

12 pages, 11155 KiB

Open AccessArticle

Nanostructure Effect on Magnetization Processes in FePt Polytwin Crystals

by Jingwei Yi, Xinyu Xu, Wenqin Yue, Feiyang Liu, Jingzhi Hu and Liwei D. Geng

Materials 2023, 16(21), 6863; https://doi.org/10.3390/ma16216863 - 26 Oct 2023

Viewed by 1318

Abstract

In FePt polytwin crystals with large magnetocrystalline anisotropy, the boundaries may play a crucial role in the magnetization processes occurring under an external magnetic field. In this study, we employed phase-field modeling and computer simulations to systematically investigate the effect of three types of polytwin boundaries—namely, symmetric (Type I), asymmetric (Type II), and mixed (Type III) boundaries—on magnetization processes as well as coercive fields under an external magnetic field along various directions. Because of the large anisotropy of FePt, the domain wall motion mechanism is usually dominant in the domain switching processes, while the magnetization rotation mechanism only becomes important at the late magnetization stage under a high external magnetic field. Among these three types of polytwin boundaries, the low coercivity is mainly due to the domain wall motion process, which starts from the intersection point at the polytwin boundary. The coercive field for the mixed polytwin boundary (Type III) is always in between the values of Type I and II. Full article

(This article belongs to the Special Issue Structures, Properties and Functionalities in Multiferroic Materials)

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12 pages, 6677 KiB

Open AccessArticle

Phase-Field Study of Exchange Coupling in Co-Pt Nonstandard Nanochessboards

by Keran Xu, Jiabei Tang, Yanzhe Wang, Yinning Zhu and Liwei D. Geng

Materials 2023, 16(16), 5689; https://doi.org/10.3390/ma16165689 - 18 Aug 2023

Viewed by 1354

Abstract

The Co-Pt binary system can form a two-phase nanochessboard structure comprising regularly aligned nanorods of magnetically hard tetragonal L1₀ phase and magnetically soft cubic L1₂ phase. This Co-Pt nanochessboard, being an exchange-coupled magnetic nanocomposite, exhibits a strong effect on magnetic domains and coercivity. While the ideal nanochessboard structure has tiles with equal edge lengths (a = b), the non-ideal or nonstandard nanochessboard structure has tiles with unequal edge lengths (a ≠ b). In this study, we employed phase-field modeling and computer simulation to systematically investigate the exchange coupling effect on magnetic properties in nonstandard nanochessboards. The simulations reveal that coercivity is dependent on the length scale, with magnetic hardening occurring below the critical exchange length, followed by magnetic softening above the critical exchange length, similar to the standard nanochessboards. Moreover, the presence of unequal edge lengths induces an anisotropic exchange coupling and shifts the coercivity peak with the length scale. Full article

(This article belongs to the Special Issue Structures, Properties and Functionalities in Multiferroic Materials)

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9 pages, 471 KiB

Open AccessArticle

Direct Observation of the Spin Exciton in Andreev Spectroscopy of Iron-Based Superconductors

by Maxim M. Korshunov, Svetoslav A. Kuzmichev and Tatiana E. Kuzmicheva

Materials 2022, 15(17), 6120; https://doi.org/10.3390/ma15176120 - 3 Sep 2022

Cited by 3 | Viewed by 1806

Abstract

Quasiparticle excitations provide viable information on the physics of unconventional superconductors. Higgs and Leggett modes are some of the classic examples. Another important bosonic excitation is the spin exciton originating from the sign-changing superconducting gap structure. Here we report a direct observation of the temperature-dependent spin exciton in the Andreev spectra of iron-based superconductors. Combined with the other experimental evidence, our observation confirms the extended s-wave (

s_{\pm}

) order parameter symmetry and indirectly proves the spin-fluctuation mechanism of Cooper pairing. Full article

(This article belongs to the Special Issue Structures, Properties and Functionalities in Multiferroic Materials)

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12 pages, 4723 KiB

Open AccessArticle

Magnetic Collapse in Fe₃Se₄ under High Pressure

by Lyudmila V. Begunovich, Maxim M. Korshunov and Sergey G. Ovchinnikov

Materials 2022, 15(13), 4583; https://doi.org/10.3390/ma15134583 - 29 Jun 2022

Cited by 2 | Viewed by 1785

Abstract

Electronic structure and magnetic properties of Fe

_{3}

_{4}

are calculated using the density functional approach. Due to the metallic properties, magnetic moments of the iron atoms in two nonequivalent positions in the unit cell are different from ionic values for Fe [...] Read more.

Electronic structure and magnetic properties of Fe

_{3}

_{4}

^{3 +}

and Fe

^{2 +}

and are equal to

M_{1} = 2.071 μ_{B}

and

M_{2} = - 2.042 μ_{B}

, making the system ferrimagnetic. The total magnetic moment for the unit cell is

2.135 μ_{B}

. Under isotropic compression, the total magnetic moment decreases non-monotonically and correlates with the non-monotonic dependence of the density of states at the Fermi level

N (E_{F})

. For 7% compression, the magnetic order changes from the ferrimagnetic to the ferromagnetic. At 14% compression, the magnetic order disappears and the total magnetic moment becomes zero, leaving the system in a paramagnetic state. This compression corresponds to the pressure of 114 GPa. The magnetic ordering changes faster upon application of an isotropic external pressure due to the sizeable anisotropy of the chemical bondings in Fe

_{3}

_{4}

. The ferrimagnetic and paramagnetic states occur under pressures of 5.0 and 8.0 GPa, respectively. The system remains in the metallic state for all values of compression. Full article

(This article belongs to the Special Issue Structures, Properties and Functionalities in Multiferroic Materials)

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