Article
Chemistry, Physical
Wei Zheng, Guangqiang Zhang, Qian Zhang, Haichen Yu, Zongzhen Li, Mingyu Gu, Su Song, Shaoxiong Zhou, Xuanhui Qu
Summary: This research studied the effects of normal annealing (NA) and magnetic field annealing (FA) on the soft magnetic properties and microstructure of Fe82Si2B13P1C3 amorphous alloy iron cores. Different methods of magnetic field application were used during the annealing process. The results showed that Fe82Si2B13P1C3 had lower loss and higher coercivity than commercially produced Fe80Si9B11. The annealing process also led to the formation of wide strip domains with low resistance and easy magnetization in the Fe82Si2B13P1C3 iron cores.
Article
Materials Science, Ceramics
Shouding Wu, Yaqiang Dong, Ronglin Zhao, Xubin Li, Hang Wu, Wei Gao, Aina He, Jiawei Li, Xincai Liu
Summary: In this study, FeSiBCCr@SiO2&ZrO2 amorphous magnetic powder cores with core-shell structure were successfully prepared using the sol-gel method. The growth mechanism and potential chemical reactions of the SiO2&ZrO2 mixed insulation layer were analyzed. The insulation layer content was found to significantly affect the soft magnetic properties of the cores, improving their resistivity, DC bias performance, and reducing core loss.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Yue Wu, Yaqiang Dong, Munan Yang, Xingjie Jia, Zhonghao Liu, Hao Lu, Haijie Zhang, Aina He, Jiawei Li
Summary: This work systematically studied the effect of the annealing process on microstructure and magnetic properties of nanocrystalline soft magnetic powder cores. The optimized microstructure led to outstanding soft magnetic properties.
Article
Engineering, Chemical
Qiang Chi, Liang Chang, Yaqiang Dong, Yiqun Zhang, Bang Zhou, Chengzhong Zhang, Yan Pan, Qiang Li, Jiawei Li, Aina He, Xinmin Wang
Summary: Fe-based amorphous magnetic powder cores with excellent properties were successfully fabricated using a uniform double insulating layer core-shell structure. The hydrothermal oxidation process can control the thickness of the Fe3O4 insulating layer to effectively suppress eddy current loss. FeSiBPC AMPCs exhibit stable magnetic properties and low core loss, making them promising for high-frequency electromagnetic systems.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Chemistry, Physical
Zhonghao Liu, Yaqiang Dong, Xincai Liu, Hao Lu, Yue Wu, Haijie Zhang, Aina He, Jiawei Li, Xinmin Wang
Summary: In this study, the effects of Ti content on the soft magnetic properties of Fe-Si-Al soft magnetic powder cores were systematically studied. It was found that the addition of Ti can effectively reduce core loss while improving resistivity and density. SMPCs doped with 0.5 wt% Ti exhibited the best magnetic properties and stable corrosion resistance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Jian Wang, Guanbiao Li, Yihai He, Jia Xu, Zhaoguo Qiu, Zhigang Zheng, Ming Xie, Yuyu Li, Yunan Tian, Xin Liu, Dechang Zeng
Summary: Low-loss FeSiAl soft magnetic composites (SMCs) were prepared through atomic layer deposition coating and high temperature annealing. The microstructural analysis showed that the Al2O3 coatings on the FeSiAl surfaces could withstand high temperature annealing and improve the magnetic properties of the SMCs. The hysteresis loss was significantly reduced, permeability was improved, and eddy current losses were decreased.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Chemical
Ronglin Zhao, Yaqiang Dong, Shouding Wu, Xubin Li, Zhonghao Liu, Xingjie Jia, Xincai Liu, Hang Wu, Wei Gao, Aina He, Jiawei Li
Summary: The study prepared ZrO2 coating layer on FeSiBNbCu spherical powder using the hydrolysis-precipitation method and investigated the magnetic properties of the FeSiBNbCu@ZrO2 nanocrystalline SMPCs. The presence of ZrO2 coating significantly reduces the eddy loss and improves the DC bias performance of the nanocrystalline SMPCs, while slightly decreasing their permeability.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Jingcheng Lin, Xuelian Li, Shaoxiong Zhou, Qian Zhang, Zongzhen Li, Mingxu Wang, Guibing Shi, Li Wang, Guangqiang Zhang
Summary: The oxidation behavior and soft magnetic properties of industrially prepared Fe80Co3Si3B10P1C3 amorphous cores were investigated under heat treatment in air. Results indicate that heat treatment in air can improve the soft magnetic properties of the cores, resulting in higher permeability and maximum saturation magnetic induction. The improvement is attributed to the formation of a Co-rich layer between the oxide layer and the amorphous substrate. The core loss exhibits different trends depending on the annealing time and conditions.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Chemistry, Physical
Zhengqu Zhu, Jiaqi Liu, Huan Zhao, Jing Pang, Pu Wang, Jiaquan Zhang
Summary: In this study, the effect of epoxy resin (EP) on the insulated coating and pressing effect of FeSiAl magnetic powders was systematically studied. Different composite powders and soft magnetic powder cores (SMPCs) were prepared by changing the content of EP, and their soft magnetic properties were characterized. The results showed that the addition of EP improved the soft magnetic properties of the FeSiAl powders, with the highest performance observed at 1 wt. % EP content. SMPCs with 1 wt. % EP content exhibited the lowest core loss and the best overall performance across the entire frequency range.
Article
Chemistry, Physical
Jiaqi Liu, Yannan Dong, Zhengqu Zhu, Huan Zhao, Jing Pang, Pu Wang, Jiaquan Zhang
Summary: FeSiBCCr amorphous powders were produced by a novel gas-water combined atomization process, and the magnetic powder cores (MPCs) fabricated from these powders exhibited high circularity, excellent thermal stability, and high saturation magnetization. The study explored the effects of phosphating treatment, cold pressing, and annealing on the properties of the MPCs, and determined the optimal conditions for achieving high permeability, low core loss, and high DC-bias% values.
Article
Materials Science, Multidisciplinary
Xubin Li, Yaqiang Dong, Xincai Liu, Shouding Wu, Ronglin Zhao, Hang Wu, Wei Gao, Aina He, Jiawei Li, Xinmin Wang
Summary: The effect of heat treatment temperature on the structural evolution and soft magnetic properties of FeSiBNbCu soft magnetic powder cores (SMPCs) was systematically investigated. It was found that a concentrated nanocrystalline structure with the best soft magnetic properties could be obtained at 600 degrees Celsius. This study provides an effective solution for the preparation of Fe-based nanocrystalline SMPCs with excellent performance and validates the application prospects under working conditions of different frequencies and ripple currents.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Hongya Yu, Jiaming Li, Jingzhou Li, Xi Chen, Guangze Han, Jianmin Yang, Rongyin Chen
Summary: The high-frequency magnetic properties of FeSiBCr amorphous powder cores were studied, and it was found that annealing at low temperatures can improve the effective permeability and reduce core loss. The sample annealed at 480 degrees C showed the best magnetic performance.
Article
Engineering, Chemical
Xubin Li, Yaqiang Dong, Shouding Wu, Ronglin Zhao, Qian Ding, Xingjie Jia, Aina He, Jiawei Li, Xincai Liu
Summary: In this study, transverse magnetic field annealing was performed on FeSiBNbCu nanocrystalline powder cores to investigate the effect on magnetic properties, microstructure, and magnetic domain structure. The results showed that transverse magnetic field annealing improved the soft magnetic properties by optimizing the domain structure and reducing the formation of micro-vortex dots.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Mingjuan Cai, Jingjing Wang, Qianqian Wang, Zhijun Guo, Qiang Luo, Jing Zhou, Tao Liang, Xuesong Li, Qiaoshi Zeng, Baolong Shen
Summary: Stress annealing is used to enhance the magnetic softness of Fe83-xCoxB10Si3C3P1 (x = 0-16) amorphous alloys with a saturation polarization of up to 1.75 T. The stress-annealed alloys exhibit improved soft-magnetic properties, including low coercivity (1.8-2.2 A/m), low core loss (0.09-0.11 W/kg at 1.0 T and 50 Hz), and high permeability (27,000-33,200 at 5 A/m and 1 kHz). The enhanced magnetic softness is attributed to the induced longitudinal magnetic anisotropy and the annihilation of free volume caused by stress annealing.
MATERIALS RESEARCH LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Pu Wang, Zhengqu Zhu, Jiaqi Liu, Huan Zhao, Jing Pang, Jiaquan Zhang
Summary: In this study, three kinds of composite powders were synthesized and prepared into corresponding SMPCs, which showed excellent soft magnetic performance. The addition of carbonyl iron powder to FeSiBC amorphous powders significantly increased the saturation magnetization, making it an ideal raw material for SMPCs. The SMPCs with a double-layer organic core-shell structure exhibited lower core loss and higher permeability compared to those with a single-layer structure.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Chemistry, Physical
Ruiheng Zhang, Aina He, Lei Xie, Jianhua Zhang, Yaqiang Dong, Jiawei Li, Bojun Zhang, Yanxin Liu
Summary: In this study, transverse magnetic field annealing was applied to a high saturation induction alloy, leading to improved high-frequency properties and refined magnetic domains. Additionally, the role of dual anisotropies on magnetic performance was investigated, providing guidance for optimizing the performance of common mode chokes.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Jijun Zhang, Zexuan Wang, Jiawei Li, Yaqiang Dong, Aina He, Guoguo Tan, Qikui Man, Bin Shen, Junqiang Wang, Weixing Xia, Jun Shen, Xin-min Wang
Summary: Manipulation of internal architecture in Fe-based amorphous coatings achieved a segregated structure with conductive networks, significantly improving EMI shielding performance. The modified coating@Al composite showed outstanding EMI shielding effectiveness compared to the Ni-Cu-P-free counterpart.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Yan Ma, Weiming Yang, Jun Pei, Hongyang Li, Hao Lu, Haishun Liu, Ming Li, Wenyu Li, Xinfa Sun, Jiawei Li, Akihisa Inoue
Summary: Fe-based amorphous and nanocrystalline alloys show potential in coating materials, with their thermal conductivity crucial for thermal insulation coating application. The study found that thermal conductivity of Fe76Si13B8Nb2Cu1 amorphous alloy significantly increased to 10.38 W/mK after annealing at 693 K, as electronic and phonon contributions started to cooperate at this temperature. This work provides insight into the thermal transport mechanisms in amorphous alloys.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Materials Science, Coatings & Films
Xiahe Liu, Laibin Wang, Mei Wang, Fenghua Li, Junjie Gao, Jiawei Li
Summary: The growth processes of trivalent chromium-based conversion coatings on galvanized steel at room temperature were investigated. The results revealed that the integrity of bi-layers formed at a specific stage enhanced corrosion resistance and film compactness. However, the protection of the surface film weakened after a certain stage, leading to the formation of defective bi-layers with mixed kinetic-diffusion control. The thermodynamic stability, layer growth, and structural evolution of the film formation on zinc were discussed using various methods.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Shouding Wu, Yaqiang Dong, Ronglin Zhao, Xubin Li, Hang Wu, Wei Gao, Aina He, Jiawei Li, Xincai Liu
Summary: In this study, FeSiBCCr@SiO2&ZrO2 amorphous magnetic powder cores with core-shell structure were successfully prepared using the sol-gel method. The growth mechanism and potential chemical reactions of the SiO2&ZrO2 mixed insulation layer were analyzed. The insulation layer content was found to significantly affect the soft magnetic properties of the cores, improving their resistivity, DC bias performance, and reducing core loss.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Aina He, Jiawei Li, Mingkun Wang, Anding Wang, Yao Xiao, Yaqiang Dong, Hai Guo, Rongrong Jiang, Weixing Xia, Lihong Dong, Haidou Wang, Jianya Ge
Summary: The phase, crystal orientation, nanostructure, and magnetic domain evolution of surface-crystallized Fe-rich alloy were systematically investigated. The results show that magnetic field annealing has a significant effect on the alloy surface, reducing excess loss and dynamic loss.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Xubin Li, Yaqiang Dong, Xincai Liu, Shouding Wu, Ronglin Zhao, Hang Wu, Wei Gao, Aina He, Jiawei Li, Xinmin Wang
Summary: The effect of heat treatment temperature on the structural evolution and soft magnetic properties of FeSiBNbCu soft magnetic powder cores (SMPCs) was systematically investigated. It was found that a concentrated nanocrystalline structure with the best soft magnetic properties could be obtained at 600 degrees Celsius. This study provides an effective solution for the preparation of Fe-based nanocrystalline SMPCs with excellent performance and validates the application prospects under working conditions of different frequencies and ripple currents.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2022)
Article
Chemistry, Physical
Junwei Zheng, Qian Ding, Aina He, Yaqiang Dong, Lei Xie, Xubin Li, Xincai Liu, Jiawei Li
Summary: Fe-Si-B-Cu-Nb nanocrystalline ribbons with increased annealing process window and insensitivity to impurities and surface-crystallized layer were successfully prepared using industrial raw materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Wei Gao, Yaqiang Dong, Yan Ma, Hang Wu, Xingjie Jia, Zhonghao Liu, Xubin Li, Ronglin Zhao, Shouding Wu, Qiang Li, Aina He, Jiawei Li
Summary: Al1.5(CoxFe6-x)6Cr high-entropy alloy soft magnetic powder cores were prepared via gas atomization and insulation. The Co/Fe ratio significantly influenced phase formation, microstructure evolution, and soft magnetic properties. The B2 phase, precipitated from the BCC matrix, replaced the BCC phase as the matrix at x = 4, contributing to the optimization of soft magnetic properties. The SMPC composed of the BCC single phase exhibited excellent soft magnetic properties.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Xubin Li, Jianjun Huang, Yaqiang Dong, Xincai Liu, Ronglin Zhao, Shouding Wu, Hang Wu, Wei Gao, Aina He, Jiawei Li
Summary: This work systematically investigates the effect of Ge content on the soft magnetic properties and microstructure of FeSiGe soft magnetic powder cores (SMPCs). The results show that the addition of Ge increases the electrical resistivity of Fe93.5-xSi6.5Gex SMPCs and influences the coercivity. Optimal magnetic properties are achieved with 2 wt% Ge content, including stable effective permeability of 78.4 up to 1 MHz, low core loss of 589.5 mW/cm3 at a maximum magnetic induction of 0.1 T and frequency of 50 kHz. Doping with Ge reduces micro-vortex dots and facilitates domain wall movement, leading to improved magnetic properties.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Haoran Ma, Yanxin Liu, Shuang Zheng, Xiahe Liu, Jiawei Li
Summary: The passivation and microstructure of Fe-based metallic glasses (MGs) with different contents of essential elements in 3.5 wt% NaCl solution were investigated. It was found that the strongly Cr-enriched passive film on Fe48Cr15Mo14C15B6Y2 (Cr15Mo14) generated a higher resistance than that of Fe63Cr8Mo3.5C4B4Ni5P10Si2.5 (Cr8Mo3.5) with a Fe-rich film in the low passive potential region. However, as the potential increased, the enhanced hydration caused a film degradation of Cr15Mo14 while the stable Si-oxide enriched and maintained the high film protection of Cr8Mo3.5. Thus, the corrosion resistance of Cr8Mo3.5 became better than that of Cr15Mo14 in the high passive potential region.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Electrical & Electronic
Guohua Wang, Aina He, Yaqiang Dong, Jiawei Li
Summary: This article analyzes and assesses the global development trend and key technologies of amorphous and nanocrystalline soft magnetic ribbons (ANSMR) based on patent documents. It provides insights into annual patent application trends, top application countries, distribution of ANSMR technologies, patentee types, and technology roadmap. The study reveals that China and Japan are the major contributors of ANSMR patents, with China, Korea, and Japan being the most active application countries in recent years. The ANSMR technologies mainly focus on alloy composition, ribbon preparation, and application technology, with a trend towards higher saturation induction, wider ribbons, and high-efficient and high-frequency applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Ceramics
Limeng Hu, Chunyang Mu, Haoran Ma, Aina He, Yaqiang Dong, Deren Li, Qikui Man, Jiawei Li
Summary: The effects of Cr doping and annealing temperature on the microstructure, soft magnetic properties, giant magneto-impedance (GMI) effect and corrosion resistance of Co68.15Fe4.35Si12.5B15-xCrx (x = 0, 1, 2, 3, 4 at.%) ribbons were investigated. Appropriate Cr content (<= 3 at.%) effectively improves the thermal stability, magnetic softness, and GMI value of the ribbons, whereas more Cr deteriorates the magnetic properties owing to the precipitation of Co-Fe nanocrystals in the amorphous matrix. In addition, the corrosion resistance increases gradually with the increase of Cr content. The x = 3 ribbon annealed at 753 K exhibits low coercivity of 0.45 A/ m, high permeability of 22,000 at 1 kHz, large GMI value of 196% at 5 MHz, and great sensitivity of 118%/Oe, which is superior to other ribbons. The variation of magnetic properties was explained by the change of magnetic anisotropy and permeability owing to the Cr doping and isothermal annealing.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Physics, Applied
Fangyi Wu, Zhonghao Liu, Yaqiang Dong, Ruiheng Zhang, Aina He, Yufan Ling, Jiawei Li, Xincai Liu
Summary: This paper systematically studied the effects of silicone resin content, compaction pressure, and annealing temperature on the magnetic properties, microstructure, and magnetic domains of Fe-6.5 wt.%Si SMPCs. The results showed that SMPCs with 1 wt.% SI content and pressed at 1800 MPa exhibited low total loss and high B-s. Annealing at 850 degrees C resulted in dense recrystallized grains with large-angle grain boundaries and easily mobile domain walls, leading to low hysteresis and total loss. A higher temperature of 950 degrees C slightly increased hysteresis and eddy loss.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2023)
Article
Materials Science, Multidisciplinary
Wei Gao, Yaqiang Dong, Xingjie Jia, Liping Yang, Xubin Li, Shouding Wu, Ronglin Zhao, Hang Wu, Qiang Li, Aina He, Jiawei Li
Summary: Co4Fe2Al1.5Mn1.5 high-entropy alloy with exceptional soft magnetic properties was investigated. It exhibited the highest saturation magnetization strength (161.3 emu g -1) reported for magnetic HEAs, low coercivity (1.9 Oe), high electrical resistivity (173 mu S2 cm), and superior thermal stability up to 600 degrees C. Microstructure of B2 nanoparticles in a DO3 matrix phase and the transition of Mn from antiferromagnetism to ferromagnetism with the assistance of Al contributed to these properties. This study paves the way for the development of soft magnetic HEAs with promising applications.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(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)
