Magnetic Materials - Science topic

This Special Issue focuses on the development and application of improved superconductor compounds, high-remnant-flux permanent magnets, and high-magnetic-permeability materials for power applications. We welcome the submission of studies on the development of material crystals consisting of novel and doped compounds for superconductor bulks, wire...

Dear Colleagues, Symmetry is one of the central concepts in modern physics and plays a fundamental role in characterizing magnetic materials. Magnetic materials are divided into metal and non-metal according to their properties. The former are mainly Fe, Co, Ni elements and their alloys, rare earth elements and their alloys, and the latter are mai...

We synthesized four Fe (67− X) Cr 31 Co X Si 2 (X = 9, 14, 19, and 24 at.%) medium-entropy alloys and investigated the effect of Co on the connection between magnetic properties and spinodal structure. When the value of X was increased from 9 to 14 at.%, both the volume fraction of α 1 phase and the composition difference between α 1 and α 2 phases...

Magnetic nanoparticle–incorporated metal organic frameworks (MOF) are potential composites for various applications such as catalysis, water treatment, drug delivery, gas storage, chemical sensing, and heavy metal ion removal. MOFs exhibits high porosity and flexibility enabling guest species like heavy metal ions to diffuse into bulk structure. Ad...

The synthesis of Nd-Fe-B magnetic powders via chemical techniques presents significant promise, but poses challenges due to their inherent chemical instability. In this investigation, Nd-Fe-B hard magnetic particles were synthesized utilizing an eco-friendly and simple microwave-assisted hydrothermal synthetic method. The technique involves the syn...

When spin-orbit coupling (SOC) is absent, all proposed half-metals with twofold degenerate nodal points at the K (or K′) point in 2D materials are classified as “Dirac half-metals” owing to the way graphene is utilized in the earliest studies. Actually, each band crossing point at the K or K′ point is described by a 2D Weyl Hamiltonian with definit...

Mn-based intermetallic compounds have attracted much attention as interesting electronic and magnetic materials exhibiting second-order magnetic phase transitions near room temperature, and as well as these materials can be considered a good model system for inspecting the fundamental aspects of the nature of complex magnetism and the issues relate...

Low-dimensional magnetic materials have attracted the attention of several researchers in recent decades, mainly because of the exotic magnetic properties and superconductivity of some of these materials. One of these materials is KTb(WO\(_4\))\(_2\), generally considered a prototype of the 2D Ising model. However, KTb(WO\(_4\))\(_2\) has some pecu...

This paper presents the MagNet-AI platform as an online platform to demonstrate the “Neural Network as Datasheet” concept for $B$ – $H$ loop modeling and material recommendation of power magnetics across wide operation range. Instead of directly presenting the measured characteristics of magnetic core materials as time sequences, we employ a neu...

The profound impact of excited magnetic states on the intricate interplay between electron and lattice behaviors in magnetic materials is a topic of great interest. Unfortunately, despite the significant strides that have been made in first-principles methods, accurately tracking these phenomena remains a challenging and elusive task. The crux of t...

This research aims to improve science learning activities and outcomes through the team assisted individualization (TAI) learning model for class VI students at SD Negeri Bawang 1 Pakis Magelang. This research is classroom action research with the implementation of Team Assisted Individualization. Classroom action research was carried out in the od...

Matrix complete dissolution combined with magnetic solid-phase extraction (MSPE) was applied to extract four benzotriazole ultraviolet stabilizers (BUVSs) from polyester curtains. Ultra-performance liquid chromatography tandem mass spectrometry was coupled to perform the content of trace BUVSs. The procedure was being developed in two steps. The po...

This paper applies machine learning to power magnetics modeling. We first introduce an open-source database – MagNet – which hosts a large amount of experimentally measured excitation data for many materials across a variety of operating conditions, consisting of more than 500,000 data points in its current state. The processes for data acquisition...

Eddy Current Tomography (ECT) is a very well established Electromagnetic Nondestructive Evaluation method for the imaging of conducting and possibly magnetic materials. It relies on the capability of low-frequency electromagnetic fields to penetrate conducting materials. The underlying physical principle is electromagnetic induction, where the disp...

This article discusses the issue of production a motor-wheel for prototypes of mini-electric vehicles based on new soft magnetic materials. The structure and morphology of the surface obtained composite materials have studied. The density value calculated from the X-ray diffraction data is about 3% higher than the directly measured values, which ar...

The emergence of magnetic polymer composites has had a transformative impact on the field of soft robotics. This overview will examine the various methods by which innovative materials can be synthesized and utilized. The advancement of soft robotic systems has been significantly enhanced by the utilization of magnetic polymer composites, which ama...

In order to develop carbonyl iron-enhanced electromagnetic wave-absorbing composites, this paper utilizes two different morphologies of carbonyl iron powder (CIP), spherical and flake-like, which are blended with aqueous polyurethane (PU) in three different ratios to prepare impregnating solutions. Polyester (PET) needle-punched nonwoven materials...

Spinel ferrites, ZnFe2O4, MnFe2O4, and ZnMnFe2O4, were synthesized using the sol–gel method and thoroughly investigated for their potential as catalytic and magnetic materials. Experiments unveiled that ZnMnFe2O4 exhibited excellent catalytic and magnetic properties, whereas the Density Functional Theory (DFT) calculations provided insight into the...

Magnetic polymer composites have recently attracted considerable interest, primarily because of their promising applications, especially in the biomedical industry. The aim of this study is to investigate the impact of ultraviolet C (UVC) irradiation as a disinfection method on the mechanical characteristics of composite polymer magnets. Tensile an...

Ferromagnetism in 2D materials has attracted tremendous interest from the scientific community thanks to its potential for the design of magnetic materials with unique properties. The presence of a ferromagnetic element in a 2D material can improve the existing properties and offer new ones, giving rise to the development of manifold applications....

The study and application of green and economical silica adsorbents at the industrial level for the recovery of gold and silver from cyanide-rich aqueous solution systems in the mining industry has a great relevance, since activated carbon generates fine carbon particles that represent a monthly loss of 1938 g/ton of silver in some cyanidation plan...

Rare-earth-free permanent magnets with the L10 phase are actively researched for their potential as a future class of magnetic materials, capable of operating at higher temperatures and in challenging corrosion environments such as renewable energy applications. Among these classes, MnGa shows potential, being cost effective and having interesting...

Spherically shaped trimetallic MnAl2O4 (MAO) nanoadsorbent was prepared in an one-pot synthesis process for the removal of excess fluoride from water. The adsorbent was characterized by thermogravimetric analysis (TGA), X-ray diffraction study (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM)...

This work reports the engineering of the magnetic properties of composites based on acrylonitrile butadiene styrene (ABS) by the inclusion of different magnetic nanoparticles (MNP). ABS‐based composites with different MNP, including permalloy, Fe 3 O 4 , CoFe 2 O 4, Ni, and Co‐carbon coated, with a 10 wt% content have been prepared and their morpho...

Bipolar magnetic semiconductor (BMS) is a class of magnetic semiconductors, whose valence band maximum and conduction band minimum are fully spin-polarized with opposite spin directions. Due to the special energy band, half-metallicity can be easily obtained in BMS by gate voltage, and the spin polarization can be reversed between spin-up and down...

Spin wave resonance (SWR) frequency in ferromagnetic thin film with the biquadratic exchange interaction, interlayer exchange coupling, film thickness, surface anisotropy field, and the external magnetic field has been investigated by using the linear spin-wave approximation and Green’s function techniques. In comparison to previous studies without...

Intrinsic magnetic noise limits the functionality of all magnetic field sensors and related devices using magnetic films as sensing elements. A novel origin of magnetic noise due to ferromagnetic material's magnetostriction is revealed by implementing a comprehensive multi‐level signal‐noise model and thoroughly validating it experimentally on magn...

Magnetic alloys are key to develop efficient catalysts for oxygen reduction reaction (ORR) in fuel cells. During the last decade, it has been shown that spin manipulation of magnetic materials can improve the kinetics of triplet state ³O2 electrocatalysis, promoting the unification between the physics of strongly correlated materials and heterogene...

Rapid development of very fast and efficient SiC and GaN semiconductors allows for creating highly efficient power converters operating in the megahertz range. Some designers and manufacturers boast product efficiencies above 99%. To achieve this high total converter efficiency requires not only that the semiconductor portion of the converter be ex...

In this study, we give a thorough evaluation of the structural, magnetic, and magnetocaloric properties in iron-rich PrFe11Ti intermetallic alloy with ThMn12-type structure using a combination of experimental and theoretical analysis. X-ray diffraction coupled with Rietveld refinement was used to characterize the structure, which revealed a unique...

This study investigates how spin waves, also known as magnons, travel in magnetic microstrips made of Yttrium Iron Garnet (YIG) using micromagnetic simulations. Spin waves show promise for signal processing, logic operation, and filtering in the fields of spintronics and magnonics, and this is currently an active and interesting area of study. The...

To research the magnetic field and mechanical characteristics of the permanent magnet governor, the static magnetic field of the sector permanent magnet is analyzed by the molecular current method in the permanent magnet governor. The magnetic flux distribution is acquired at any spatial position. Comparing the analytical value with the simulation...

The geometry and anisotropic properties of 3D magnetic nanostructures have a direct impact on their magnetization properties and functionalities due to the presence of spatial coordinates. This has stimulated the exploration and synthesis of various types of nanosized magnetic materials for use in magnetic energy harvesting technology. Herein, anis...

A computational analysis is conducted to understand the impact of Al and Sr substitutions on the structural and magnetic properties of M-type barium hexaferrite (BaFe12O19 or BFO). Al substitutions in BFO led to concentration-dependent increases in lattice parameters and magnetocrystalline anisotropy energy (E_MCA), while the magnetic moment showed...

Micromagnets have wide applications in MEMS and micromotors but there are still miniaturization limitations in current microfabrication processes for permanent magnets. A novel damage-free ultrashort pulsed laser machining process to manufacture complex shapes of Sm2Co17 micromagnets is proposed in this work. Laser process permits to further miniat...

We propose a machine-learning interatomic potential for multi-component magnetic materials. In this potential we consider magnetic moments as degrees of freedom (features) along with atomic positions, atomic types, and lattice vectors. We create a training set with constrained DFT (cDFT) that allows us to calculate energies of configurations with n...

The phase of the quantum-mechanical wave function can encode a topological structure with wide-ranging physical consequences, such as anomalous transport effects and the existence of edge states robust against perturbations. While this has been exhaustively demonstrated for electrons, properties associated with the elementary quasiparticles in magn...

To broaden pH range and improve thermal stability, reusability, storage stability, and organic solvent tolerance of natural enzymes, a magnetic material (NH2-MIL-88(Fe)) was synthesized as a new material to immobilize cellulase. The results showed that the optimal temperature and pH of cellulase immobilized on NH2-MIL-88(Fe) showed a wider range co...

Dual-phase magnetic material - a magnetic material in which, by processing, localized non-magnetic areas can be obtained to control the direction of the magnetic flux. Such properties can significantly improve the output characteristics of a number of topologies of electrical machines, as well as neutralize a number of the main disadvantages inhere...

The long-term sustainability of the global water supply, with a paramount emphasis on cleanliness and safety, stands as a formidable challenge in our modern era. In response to this pressing issue, adsorption techniques have emerged as pivotal and widely recognized solutions for the removal of hazardous pollutants, with a particular emphasis on lea...

Ferrite with the formula CoCrxFe2−xO4 (x = 0.05, 0.10, 0.15, and 0.20) (CCF) prepared by sol–gel process were studied. The structural, morphological, magnetic properties, and di-electric behavior of the specimens were understood by using X-ray diffraction (XRD), scanning electron microscopy (SEM), and Energy-dispersive X-ray (EDX) spectroscopy, Fie...

Our study on functional metal oxides for the past 45 years is reviewed. Conversion Electron Mössbauer Spectroscopy (CEMS) and the depth selective CEMS (DCEMS) using a gas-flowing detector are useful in characterizing the surface layer of oxide on steel and stainless steel. The thin oxide layer on stainless steel responds well as a pH sensor. ⁵⁷Fe i...

Magnetic materials are materials with specific magnetic properties, produced mainly by chemical methods such as co-saturation and high temperature pyrolysis, and with controllable product morphology and size. Magnetic particles have a high surface activity and a tendency to agglomerate, which can not only improve their dispersion and biocompatibili...

Magnetic materials could realize the intriguing quantum anomalous Hall effect and metal-to-insulator transition when combined with band topology or electronic correlation, which have broad prospects in quantum information, spintronics, and valleytronics. Here, we propose the approach of designing novel two-dimensional (2D) magnetic states via d-orb...

We present ab initio calculations of hidden magnetoelectric multipolar order in Cr2O3 and its iron-based analog, α−Fe2O3. First, we discuss the connection between the order of such hidden multipoles and the linear magnetoelectric effect. Next we show the presence of hidden antiferroically ordered magnetoelectric multipoles in both the prototypical...

The emergence of topological magnetism in two-dimensional (2D) van der Waals (vdW) magnetic materials promoted 2D heterostructures as key building-blocks of devices for information technology based on topological concepts. Here, we demonstrate the all-electric switching of the topological nature of individual magnetic objects emerging in 2D vdW het...

Quantum information processing promises to revolutionise computing; quantum algorithms have been discovered that address common tasks significantly more efficiently than their classical counterparts. For a physical system to be a viable quantum computer it must be possible to initialise its quantum state, to realise a set of universal quantum logic...

This paper motivates the development of sophisticated data–driven models for power magnetic material characteristics.Core losses and hysteresis loops are critical information in the design process of power magnetics, yet the physics behind them is not fully understood or directly applicable. Both losses and hysteresis loops change for each magnetic...

Minimally invasive endovascular procedures rely heavily on catheter devices. However, traditional catheters lack active steering requiring considerable skill on the surgeon’s part to accurately position the tip. While catheter tips could be made steerable using tendon-driven and Pneumatic Artificial Muscle (PAM) approaches, remote magnetic actuatio...

Since the emergence of two‐dimensional (2D) magnets in 2017, the diversity of these materials has greatly expanded. Their 2D nature (atomic‐scale thickness) endows these magnets with strong magnetic anisotropy, layer‐dependent and switchable magnetic order, and quantum‐confined quasiparticles, which distinguish them from conventional three‐dimensio...

Magnetic materials in reduced dimensions are not only excellent platforms for fundamental studies of magnetism, but they play crucial roles in technological advances. The discovery of intrinsic magnetism in monolayer 2D van der Waals systems has sparked enormous interest, but the single‐chain limit of 1D magnetic van der Waals materials has been la...

The ability to manipulate spins in magnetic materials is essential in designing spintronics devices. One method for magnetic switching is through strain. In VO2 on TiO2 thin films, while VO2 remains rutile across the metal–insulator transition, the in-plane lattice area expands going from a low-temperature insulating phase to a high-temperature con...

Magnetic materials with strong perpendicular magnetic anisotropy are of great interest for the development of nonvolatile magnetic memory and computing technologies due to their high stabilities at the nanoscale. However, electrical switching of such perpendicular magnetization in an energy‐efficient, deterministic, scalable manner has remained a b...

The structure of a material is an important factor in determining its physical properties. Here, we adjust the structure of the Ni50Mn37Ga13 spun ribbons by changing the wheel speed to regulate the exchange bias effect of the material. The characterization results of micromorphology and structure show that as the wheel speed increases, the martensi...

Molecule‐based magnetic materials are useful candidates as the spin qubit due to their long coherence time and high designability. The anisotropy of the g‐values of the metal complexes can be utilized to access the individual spin of the metal complexes, making it possible to achieve the scalable molecular spin qubit. For this goal, it is important...

This study airms to examine differences in understunding the concept of magnets and arguments about magnets at different grade levels. This type of research is survey research. The research subjects consisted of 188 students spread across different grade levels and school in the city of Kupang, namely class VI of elementary school, class VII of jun...

The generation of localized magnetic field gradients by on-chip nanomagnets is useful for a variety of technological applications, in particular, for spin qubits. To advance beyond the empirical design of these nanomagnets, we propose a systematic and general approach based on the micromagnetic formulation of an optimal field gradient source. We st...

This paper presents the evaluation of tested inductive CTs’ accuracy for distorted current harmonics in accordance with the optional accuracy class WB1 introduced by the new edition of the standard IEC 61869-1 published in the year 2023. The tests were performed in compliance with the interpretation sheet IEC 61869-2:2012/ISH1:2022. Therefore, the...

The field of two-dimensional magnetic materials has paved the way for the development of spintronics and nanodevices with other functionalities. Utilizing antiferromagnetic materials, in addition to layered van der Waals (vdW) ferromagnetic materials, has garnered significant interest. In this work, we present a theoretical investigation of the beh...

Present work focuses to investigate the impact of rare earth ions (Ce and Gd) on the structural and magnetic properties of nanocrystalline nickel-zinc ferrite. The nanoparticles of Ni0.5Zn0.5Fe2O4, Ni0.5Zn0.5Ce0.02Fe1.98O4, and Ni0.5Zn0.5Gd0.02Fe1.98O4 were synthesized by citric acid–assisted sol–gel method. The formation of cubic spinel structure...

A comparison of the results of studies on the influence of structural defects on the critical parameters of superconductivity has been made for the high-entropy alloy (NbTa)0.67(MoHfW)0.33 and for the conventional superconducting magnet material Nb-47wt%Ti. Positron annihilation lifetime spectroscopy (PALS), electrical resistivity, magnetization an...

Various mechanical antennas have emerged to overcome the inherently narrower bandwidth and degraded efficiency in electrically small antennas. Among them, multiferroic antennas are expected to realize high-frequency applications and maintain their performance, even with significantly reduced sizes. However, experimental proof of such radiation from...

Una superred magnética o multicapa, consiste en un arreglo secuencial alternado de capas de un material magnético y uno no magnético con espesores en la escala de los nanómetros, dentro del rango de longitud característica de la interacción magnética entre las capas de la superred. Estas heteroestructuras exhiben comportamientos nuevos e interesant...

In this work, M-type strontium ferrite Lu x SrFe 12−x O 19 (x = 0, 0.2, 0.4, 0.6) was prepared using a precursor chemical co-precipitation method. The structures, morphologies, and elemental compositions of the samples were analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The magnetic properties of the prepared samples...