Article
Polymer Science
R. Dilip, R. Jayaprakash
Summary: In this study, M-doped BaFe2O4 (M-Co, Ni, and Mn) nanoparticles were synthesized via auto combustion method, with the weight percentage of metals optimized. XRD and FTIR confirmed the structural and vibrational characteristics of the materials, while FESEM and TEM images visualized morphological changes induced by the surfactant n-heptane. The magnetic properties were analyzed using VSM, revealing ferromagnetic behavior, and dielectric constant variations were examined through dielectric studies.
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
(2021)
Article
Materials Science, Ceramics
Xiang Yu, Lichen Wang, Ruoshui Liu, Ningfang Zhou, Zhiyi Xu, Huayang Gong, Tongyun Zhao, Jirong Sun, Fengxia Hu, Baogen Shen
Summary: We synthesized Sr1-xNdxFe12-yCoyO19 (x = 0-0.25, y = 0-0.1) using a conventional ceramic route and analyzed the crystal structures using X-ray diffraction. With increasing Nd3+ and Co2+ contents, lattice constant a increases, while lattice constant c decreases. The magnetic properties are improved when x = y = 0.1 (equal co-substitution), and further improved when x is increased (unequal co-substitution), reaching optimum values of Ms = 76.4 emu/g and Hc = 5115 Oe due to the occupation of the 2a site by divalent Fe2+. The occupancies of Co2+ and Fe2+ are further verified using Raman spectroscopy.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Jiang Zou, Lifeng Wang, Juan He, Bo Wu, Quan Xie
Summary: This study prepared magnetic materials with different dopants using ball milling and sintering processes, and investigated their crystal structures, electrical conductivity, and magnetic properties using various testing methods. The results showed that the dopants enhanced the electrical conductivity and magnetic properties of the materials. Additionally, an improvement in permeability was observed for specific doped alloys.
Article
Engineering, Electrical & Electronic
Reena Dhyani, R. C. Srivastava, Gagan Dixit
Summary: This study focuses on the investigation of magnetic and temperature-dependent dielectric properties of Co-CuFe2O4 nanoferrites. Cu0.5Co0.5Fe2O4 nanoparticles exhibit the highest magnetic properties and lower dielectric loss, making them potential candidates for high density magnetic recording media and power transformers at high frequencies.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Article
Materials Science, Ceramics
Muhammad Junaid, Ijaz Ahmad Qazafi, Muhammad Azhar Khan, Shagufta Gulbadan, Syed Zafar Ilyas, H. H. Somaily, Mohamed S. Attia, Mohammed A. Amin, H. M. Noor ul Huda Khan Asghar
Summary: The impact of Ni2+ and Zr4+ on the physical properties of LiFe2O4 ferrites synthesized via the microemulsion technique was investigated. The substitution of Ni2+ and Zr4+ ions led to changes in lattice constant, crystallite size, X-ray density, dielectric parameters, and magnetic properties of lithium ferrites.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Parvin Imanipour, Saeed Hasani, Amir Seifoddini, Marcin Nabialek
Summary: In this study, cobalt ferrite magnetic nanoparticles doped with zinc and vanadium were synthesized using the sol-gel auto-combustion method. The samples were characterized using various techniques, and the results showed that doping affected the crystal structure, grain size, and morphology of the synthesized particles, as well as the saturation magnetization and coercivity. These findings are of great importance for understanding the physical properties and applications of cobalt ferrite.
Article
Environmental Sciences
J. F. Joe Sherin, T. C. Bessy, S. Asha, C. Vijaya Kumar, Dina Huessien, M. R. Bindhu, Rabab Ahmed Rasheed, Khaloud Mohammed Alarjani
Summary: A novel photocatalyst based cobalt doped zinc ferrites nanoparticles (Co-ZnFe2O4 NPs) was prepared and characterized in this study. The results showed that the amorphous ferrites of the samples disappeared with increasing calcinations temperature, affecting the band gap energy and the intensity of photoluminescence peak. Cobalt substitution improved the saturation magnetization and antimicrobial activity of the samples.
ENVIRONMENTAL RESEARCH
(2022)
Article
Engineering, Electrical & Electronic
Xuhang Zhang, Yaqiang Dong, Changjiu Wang, Aina He, Jiawei Li, Fushan Li, Liang Chang, Qiang Chi, Xiaoxue Shui
Summary: The influence of phosphorus content on Fe81.5Si3B10+xP3.5-xC0.2Cu0.8Nb1 alloys has been studied, showing improvements in Curie temperature and saturation magnetic flux density with decreased P content. Optimal magnetic field annealing technique results in amorphous alloys with good soft magnetic properties, indicating the importance of phosphorus content and annealing conditions in enhancing magnetic performance.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Fan Jiang, Jianghe Lan, Zhantao Wei, Bin You, Jun Li, Yang Li, Deli Shi, Zhengwei Xiong, Pingchuan Zhang, Jinsong Chen
Summary: By investigating the cooperation effect of In3+ and V5+ co-doped into bismuth-iron garnets, it was found that the total doped concentration decreased with the increase in V concentration and decrease in In concentration. The synthesized bismuth-iron garnets presented a well single-crystal structure, with the lattice spacing decreasing as x + y decreased. Both the Curie temperature and saturation magnetization showed a linear increase with the decrease of x + y.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Materials Science, Ceramics
Junpeng Wu, Shijun Dong, Huan Li, Hui Zheng, Qiong Wu, Peng Zheng, Liang Zheng
Summary: In this study, high-valence molybdenum (Mo6+) was doped into M-type hexagonal barium ferrite (BaFe12-xMoxO19) to improve its electromagnetic performance. The results showed that the Mo6+ doping concentration had a significant impact on the crystallographic structure, morphology, and electromagnetic properties of the material. The microwave absorption properties were notably improved by the doping Mo6+, demonstrating its potential application as an absorbing material.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Huichao Liu, Sheng Zhu, Yu Zhang, Hua Song, Ying Zhang, Yunzhen Chang, Wenjing Hou, Gaoyi Han
Summary: This study reports the synthesis of B, N co-doped porous carbon sheet (BN-PCS) by one-pot pyrolysis of agar in KCl/KHCO3 molten salt system. The BN-PCS exhibits a specific capacitance of 361.1 F g(-1) at a current density of 0.5 A g(-1) in an aqueous KOH electrolyte. The study demonstrates the effectiveness of the one-pot molten salt method in engineering advanced carbon materials for high-performance energy storage devices.
Article
Materials Science, Ceramics
G. R. Patta, V. Chitti Babu, V. Ravi Kumar, N. Veeraiah
Summary: In this study, cobalt ferrite nanocrystalline powders were prepared with different chelating agents/gelation promoters through sol-gel method, and the samples prepared with lower molecular weight chelating agent showed higher saturation magnetization. The reasons for this phenomenon were identified and discussed in the analysis of the results.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
R. Sagayaraj, S. Sebastian
Summary: Z-type hexaferrites with polycrystalline characteristics were synthesized using co-precipitation method. The XRD results confirmed the polycrystalline phase and 6 nm particle size of the Z-type ferrite nanoparticles. The FTIR spectrum showed resonances corresponding to tetrahedral and octahedral voids and a stabilized ferrite structure. These special ferrite materials exhibited ferrimagnetic properties and high coercivity, making them useful for microwave absorption, high-frequency applications, and magnetic recording media.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Manoj Salgaonkar, R. S. Gad
Summary: Rare earth (Gd+3) substitution in nanocrystalline cobalt ferrite materials was investigated, showing essential magnetic characteristics for biomedical applications. The structure and properties alterations were studied using XRD, EDS, and SEM.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Chemistry, Physical
M. I. Arshad, M. S. Hasan, Atta Ur Rehman, N. Amin, Le Duc Tung, N. T. Kim Thanh, N. A. Morley, Mongi Amami, Faisal Alresheedi, Safa Ezzine, M. A. Gadhi
Summary: A series of Zn0.4Co0.6-xMgxFe1.9La0.1O4 nanoferrites were synthesized via co-precipitation technique, and the influence of Mg doping on the crystal structure, electrical, and magnetic properties was investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Thermodynamics
Ying Liu, Yue Liu, Michael G. B. Drew
Summary: The study of the Gibbs-Duhem equation and its applications is one of the most difficult topics in thermodynamics. This paper presents a novel mathematical derivation that is shown to be more natural, direct, and intuitive than the traditional thermodynamic derivation. By introducing Legendre transformations, multiple perspectives for problem-solving are provided.
INTERNATIONAL JOURNAL OF THERMOPHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Ying Liu, Yue Liu, Michael G. B. Drew
Summary: For many years, it has been common practice to use reflection loss defined for devices to characterize materials, which has caused many problems. By replacing the flawed theory of impedance matching with wave superposition theory and using simple geometry to represent film absorption, the real mechanism of film absorption has been revealed. It is shown that film and material are different, and absorption efficiency is influenced by factors such as wave superposition and energy conservation.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Ying Liu, Yue Liu, Michael G. B. Drew
Summary: This section discusses the application of impedance matching and quarter-wavelength theories in microwave absorption research, pointing out their flaws and proposing a new theory to replace the quarter-wavelength theory.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Ying Liu, Yue Liu, Michael G. B. Drew
Summary: Energy conservation is crucial for understanding the mechanism of microwave absorption by films. In the past, confusion between films and materials has caused many issues. By considering energy conservation, the differences between films and materials are clarified, and some difficult issues have been explained.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Jiahe Song, Kun Zhao, Xiangbin Yin, Ying Liu, Iltaf Khan, Shu-Yuan Liu
Summary: A Z-scheme g-C3N4/Ag/AgBr heterojunction photocatalyst was prepared via in-situ loading through photoreduction method. The g-C3N4/Ag/AgBr composite showed excellent photocatalytic performance in the degradation of tetracycline hydrochloride pollutants. The main active oxygen species involved in the degradation of organic pollutants were O2^- and (OH)·.
FRONTIERS IN CHEMISTRY
(2022)
Article
Physics, Applied
Ying Liu, Michael G. B. Drew, Yue Liu
Summary: In the previous Part I, it was demonstrated using transmission-line theory that impedance matching theory should be replaced by wave cancellation theory. It was also shown that film is different from the material and phase effects from interfaces should be considered in quarter wavelength theory. In this Part, it is proven that energy penetration in a film cannot be defined and impedance matching is flawed as it lacks theoretical proof and consistency with experimental data. The multiple absorption peaks in a film arise from wave cancellation under the constraint of energy conservation, rather than resonances from the material.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Applied
Ying Liu, Michael G. B. Drew, Yue Liu
Summary: This study theoretically confirms that the absorption mechanism in a film, responsible for the minima of the reflection loss (RL/dB), is best explained by wave cancelation theory rather than by impedance matching theory. The study also reveals that the mechanisms for a film and material are different. In addition, the flaws of neglecting the phase effects of interfaces in a film in quarter-wavelength theory are quantitatively discussed.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Condensed Matter
Ying Liu, Xiangbin Yin, Michael G. B. Drew, Yue Liu
Summary: By analyzing experimental data, this study provides new theoretical perspectives on the inadequacies of impedance matching theory in the field of microwave absorption. It suggests that the current theories related to impedance matching need to be replaced by wave cancellation theory, as even different criteria cannot solve the problems with impedance matching. The analysis in this work supports the new theories against the current ones by applying to published data and determining the conditions for the minima of reflection loss at large values of |Zin - Z0| through transmission-line theory.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Chemistry, Physical
Ying Liu, Yi Ding, Yue Liu, Michael G. B. Drew
Summary: It is commonly believed that two synergistic effects maximize microwave absorption power of a film - increasing the absorption power of the material and the penetration of incident microwaves into the film. However, this reasoning is incorrect as it confuses material with film and is not consistent with the real absorption mechanism. By differentiating film from material, it is shown that reflection loss (RL) is relevant only for film and the real mechanism involves balancing the intensities of the two beams reflected from the film's interfaces when they are out of phase by π. It is commonly believed incorrectly that maximum absorption from film occurs when the resultant beam reflected back to open space from the metal-back interface is weakest. But it is shown here that the opposite is true - maximum absorption occurs when this reflected beam reaches its maximum. A definition for film in the context of microwave absorption is proposed.
SURFACES AND INTERFACES
(2023)
Article
Chemistry, Physical
Ying Liu, Yi Ding, Yue Liu, Michael G. B. Drew
Summary: Part 1 of this work demonstrates that film absorption is based on wave cancellation theory (WCT) rather than the mechanism of material attenuation power and impedance matching theory (IM). The film thickness and material properties affect the pattern of the reflection loss curve and the occurrence of multiple absorption peaks. Maximum absorption occurs when the two reflected beams are out of phase by & pi; at the front of the film, regardless of whether the film has a metal back or not. WCT explains the deviations of maximum absorption positions from the predicted values of IM.
SURFACES AND INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Bibhutibhusan Nayak, S. Narayana Jammalamadaka
Summary: This article presents a method for remote detection of bovine serum albumin (BSA) using modified cantilever beam magnetometry (CBM). By combining a magnetostrictive Fe70Ga30 cantilever with optical detection technique, researchers were able to detect high concentrations of BSA remotely. The results of this study demonstrate the potential of this method in estimating the magnetostriction of thin films.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Yu Hao, R. E. Camley, Z. Celinski
Summary: Magnetic particles have various applications and their magnetic state is determined by their size and the strength of an applied magnetic field. Numerical simulations were performed to study the effect of an applied field on the critical size of single-domain magnetic particles, and the critical field at which a particle becomes single-domain was determined.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Nitesh Singh, Naresh Kumar, Dharohar Sahadot, Anil Annadi, Vidyadhar Singh, Murtaza Bohra
Summary: The unique magnetic properties of FM/AFM and hard-FM/soft-FM nanocomposite thin films have significant relevance for numerous applications. The composition and performance of different magnetic phases in the nanocomposite films can be significantly affected by the laser ablation conditions and annealing temperature.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Alya Ali Musaed, Samir Salem Al-Bawri, Khaled Aljaloud, Wazie M. Abdulkawi, Mohammad Tariqul Islam, Mandeep Jit Singh, Zaini Sakawi, Husam Hamid Ibrahim
Summary: This research presents a wideband tunable metamaterial for body-centric applications in the millimeter-wave frequency band. The proposed metamaterial has a wide operating frequency range and enhanced gain, making it suitable for improving the antenna performance in 5G wireless communication systems.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Binod K. Rai, Boris Maiorov, Krzysztof Gofryk, Patrick O'Rourke, Catherine Housley, Henry Ajo, Asraf Sawon, Arjun K. Pathak, Narayan Poudel, Qiang Zhang, Travis J. Williams, Matthias Frontzek
Summary: This manuscript reports on the structural and magnetic properties of NdCuGa3. The study confirmed the crystal structure and magnetic phase transition of NdCuGa3 using XRD, neutron diffraction, magnetization, and specific heat measurements. The neutron diffraction data further confirmed the antiferromagnetic phase of NdCuGa3.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Haonan Li, Cong Li, Hailiang Huang, Guodong Hao, Fei Wang
Summary: The electronic structure and ferroelectric-ferromagnetic coupling properties of Y-doped and vacancy-containing GaN-ZnO heterojunctions are systematically investigated. The magnetism in vacancy-containing systems is generated by the spin polarization of unpaired electrons induced by cationic vacancies, while in Y-doped systems, bound magnetic polarons are formed by the orbital hybridization of s-state and d-state electrons of Y-doped elements.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Muhammad Ijaz, Hafeez Ullah, Bandar Ali Al-Asbahi, Mati Ullah Khan, Zaheer Abbas, Sana Ullah Asif
Summary: M-type BaFe11.4-xAlxCo0.6O19 hexaferrites with Al3+ substitutions were synthesized using the co-precipitation method followed by Sonochemical process. The synthesized materials were characterized using XRD, FTIR, UV-vis spectroscopy, VSM, SEM, and LCR meter. The results showed that aluminum doping decreased the band gap and enhanced the magnetic and dielectric properties of the hexaferrites, making them suitable for various applications.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Oleg I. Utesov
Summary: The elementary excitations spectrum of anisotropic frustrated antiferromagnets in the fan phase is discussed. It is found that the low-energy part of the spectrum consists of a gapless phason branch with linear dispersion and a gapped optical branch corresponding to the fan structure amplitude oscillations. In the high-energy part of the spectrum, the excitations are similar to the magnons of the fully polarized phase.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Alexander Ya. Simonovskii, Alexander A. Yanovskii, Arthur R. Zakinyan
Summary: In this study, the departure frequency of vapor bubbles during boiling of ferrofluid in a horizontal magnetic field is experimentally investigated. Two methods, visual and inductive, are used to measure the frequency of bubble departure. The results show that the bubble departure frequency can decrease with increasing magnetic field strength and increase with increasing temperature of the heat-emitting surface. A linear stability analysis is conducted to analyze the influence of the magnetic field on the frequency of bubble formation during ferrofluid boiling.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Oleg Heczko, Michal Rames, Vit Kopecky, Petr Vertat, Michal Varga, Ladislav Straka
Summary: Heusler Ni-Mn-Ga alloys are multiferroic materials that exhibit magnetic shape memory (MSM) phenomena. By doping transition elements into Ni2MnGa alloys, the transformation temperatures can be modified and complex behaviors can be observed, such as the variation in saturation magnetization and the effects of elemental substitution on compound properties.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Carlos Ariel Samudio Perez, Ariel Flaig de Marchi
Summary: This study investigates the electronic and magnetic properties of the Full-Heusler Fe2MnAs alloy using first-principles calculations. The alloy may form spontaneously and exhibits a ferromagnetic order and high spin-polarization. It can be transformed into a half-metal by contracting the lattice constant. Additionally, certain defects contribute to the spin-polarization of the alloy, making it a fully half-metallic material.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Satish Geeri, Aditya Kolakoti, Prasadarao Bobbili
Summary: In this study, an electromagnetic wave-absorbing material was fabricated using a polymer composite material with fiber orientation and Multiwall Carbon Nanotubes as filler materials, along with a Perfect Electric Conducting material. The experiments demonstrated strong electromagnetic absorbing properties for the composites with PEC-coated and non-PEC-coated materials. Mechanical, thermal, and morphological analysis confirmed the similar trend in properties. CRITIC analysis helped identify the sequence order of sustaining properties for the fabricated composites.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Yankai Chen, Ruoxue Zhang, Yukai An
Summary: The piezoelectricity, valley character, and magnetic properties of 2H-VS2 monolayer were studied, revealing its potential applications in spintronics and valleytronics due to its bipolar magnetic semiconductor characteristics and superior physical properties.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Leonardo S. Lima
Summary: This study investigates the thermodynamic quantities, such as entropy, specific heat, and magnetic susceptibility, in the next-nearest-neighbors Heisenberg model on a honeycomb-kagome lattice. The linear spin-wave approach is applied to obtain the temperature-dependent behavior of these quantities. Additionally, the entanglement negativity, a quantifier of quantum entanglement, and the spin Hall conductivity are also studied. The results show that all the thermodynamic quantities, as well as the entanglement negativity and spin Hall conductivity, exhibit an increasing trend with temperature. Furthermore, it is found that all the analyzed quantities approach zero in the low-temperature limit, consistent with experimental observations.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Zhaoxing Wang, Maximilian Kai Reimann, Wang Chen, Yikun Zhang, Rainer Poettgen
Summary: The Mo2FeB2-type compounds RE2Ga2Mg (RE = Tm, Er, Ho) exhibit a large magnetocaloric effect, making them promising for cryogenic magnetic cooling applications.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
