Article
Chemistry, Applied
Xiaolian Liu, Mengjie Pan, Pei Zhang, Tianyu Ma, Lizhong Zhao, Lingwei Li
Summary: Homogeneous substitution of Dy for Nd in the 2:14:1 phase can enhance coercivity but reduce remanence. A comparative study showed that multi-main-phase magnet with inhomogeneous Dy distribution has better magnetic properties and thermal stability than single-main-phase magnet with homogeneous Dy distribution. The multi-main-phase magnet exhibited higher coercivity, remanence, and energy product at room temperature and over a wide temperature range.
JOURNAL OF RARE EARTHS
(2021)
Article
Chemistry, Physical
Mengxin Jin, Sining Fan, Mingpeng Kou, Heqi Wang, Zhi Jia, Yuhao Li, Guangfei Ding, Shuai Cao, Xiaodong Fan, Shuai Guo, Renjie Chen, Aru Yan
Summary: In this work, High-Co-containing RE-(Fe, Co)-B sintered magnets were developed using the dual-main-phase route. The addition of cobalt effectively suppressed the formation of Co-rich intergranular phases and increased the Co-substitution level in Nd-Fe-B magnets. These magnets exhibited high magnetic properties and offered another possibility to obtain Nd-Fe-B magnets with higher Co content and better thermal stability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Qingfang Huang, Qingzheng Jiang, Yao Shi, Sajjad Ur Rehman, Xing Wei, Zhixiang Li, Dawei Shi, Deqin Xu, Zhenchen Zhong
Summary: Post-sinter annealing is crucial for improving the microstructures and magnetic properties of NdFeB-based sintered permanent magnetic materials. It can significantly increase the intrinsic coercive force of the magnets. However, post-sinter annealing may cause a slight decrease in remanence, mainly due to the deteriorated orientation degree and reduced volume fraction of the hard magnetic main phases.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Condensed Matter
W. K. Deng, B. N. Wei, W. K. Shan, Y. X. Hua, X. Li, D. F. Guo
Summary: The addition of tantalum (Ta) has been found to refine the microstructure and improve the magnetic properties of (Nd0.4Pr0.6)(9)Fe85-xTaxB6 nanocomposite magnets. With increasing Ta content, the coercivity of the alloys significantly increases while the remanence decreases slightly. The enhancement of magnetic properties is mainly attributed to grain refinement achieved by adding Ta.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Materials Science, Multidisciplinary
Xia Ding, Xiu-Chun Wang, Kai-Hong Ding, Sheng-Li Cui, Yong-Cong Sun, Mu-Sen Li
Summary: The corrosion-resistant coating formed by phosphate chemical conversion treatment on sintered Nd-Fe-B magnets significantly improves their corrosion resistance without compromising magnetic properties, providing an effective way to enhance the corrosion resistance of these magnets.
Article
Chemistry, Applied
Ze Duan, Haicheng Xuan, Jincai Su, Jingwu Chen, Xiaofei Yi, Youhao Liu, Peide Han
Summary: By adding Tb80Fe20 alloy into the Nd-Fe-B sintered magnets, the coercivity and thermal stability of the magnets can be significantly improved. The addition of 4 wt% Tb80Fe20 alloy increases the coercivity and decreases the remanence of the magnets, as well as improves the reversible temperature coefficients of coercivity and remanence in the temperature range of 20-170 degrees Celsius. Moreover, the addition of Tb80Fe20 alloy reduces the irreversible flux magnetic loss and improves the microstructure of the magnets.
JOURNAL OF RARE EARTHS
(2022)
Article
Chemistry, Applied
Haibo Xu, Qingmei Lu, Liying Cong, Haowen Tian, Weiqiang Liu, Youhao Liu, Yunqiao Wang, Jingwu Chen, Xiaofei Yi, Ming Yue
Summary: The structural and magnetic properties of recycled Nd-Fe-B powders prepared using calcium hydride (CaH2) particles as the reducing agent were investigated. The use of CaH2 resulted in finer particle size, better size distribution, and lower impurity content compared to traditional calcium granules. Additionally, the CaH2-reduced powders exhibited higher room-temperature magnetization.
JOURNAL OF RARE EARTHS
(2022)
Article
Materials Science, Multidisciplinary
Qingfang Huang, Qingzheng Jiang, Yao Shi, Sajjad Ur Rehman, Dawei Shi, Gang Fu, Zhixiang Li, Deqin Xu, Dakun Chen, Zhenchen Zhong
Summary: This paper investigates the influence of Gallium (Ga) doping on the microstructure, thermal stability, and magnetic properties of NdFe-B based sintered magnets. It is found that the addition of Ga significantly increases the intrinsic coercivity while slightly decreasing the remanence. The Ga-doped sample also exhibits better thermal stability. Microstructural analysis shows that the addition of Ga promotes the diffusion of Nd and Cu, resulting in changes in the grain boundary phase and Fe concentration. Additionally, the Curie temperature increases after Ga doping.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Hong-Zhi Wang, Zhi-Jie Li, Zheng Liu, Yan Yan, Peng-Yuan Zhi
Summary: By adding Ho nanopowder to the grain boundaries of Nd-Fe-B magnetic materials, the magnetic, mechanical properties, and corrosion-resistant performance were improved. The optimum combination of properties was achieved when adding 0.6% Ho, with enhanced magnetic properties and improved corrosion resistance.
JOURNAL OF NANOPARTICLE RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Zhi Jia, Mingpeng Kou, Shuai Cao, Xintong Yang, Guangfei Ding, Shuai Guo, Xiaodong Fan, Bo Zheng, Renjie Chen, Aru Yan
Summary: The magnetic properties and microstructure of Nd-Ce-Y-Fe-B magnets with Nd-Co boundary additions were systematically investigated. It was found that appropriate Nd-Co addition could simultaneously improve the coercivity, remanence, and Curie temperature of the magnets. The coercivity enhancement was attributed to widened grain boundary width and reduced magnetic exchange coupling, while the remanence improvement was achieved through partial substitution. This study provides new insights into the preparation of high-abundance magnets.
RESULTS IN PHYSICS
(2022)
Article
Chemistry, Physical
X. G. Cui, G. Y. Shu, J. X. Pan, J. Zhang, W. J. Liang, L. Z. Zhao, C. Y. Cui, T. Y. Ma, Z. H. Zhao, X. L. Peng, J. Li
Summary: By combining the nanocrystalline multi-main-phase (MMP) structure and grain boundary engineering, the coercivity and thermal stability of low-cost Nd-Ce-Fe-B magnets have been simultaneously improved. The modified magnet with 2 wt% DyF3-Cu exhibited significantly enhanced coercivity and optimal maximum energy product, while maintaining good temperature stability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Applied
Jinhao Zhu, Guangfei Ding, Lei Jin, Zhehuan Jin, Bo Zheng, Shuai Guo, Renjie Chen, Aru Yan
Summary: This study proposes a grain boundary modification approach using Nd-Ga addition to significantly enhance the coercivity of B-lean Nd-Fe-B sintered magnets. The coercivity is increased from 1.51 to 2.04 T by optimizing the microstructure and adjusting the phase composition of the grain boundary phase. The addition of Nd-Ga forms a continuous thin grain boundary phase and intermetallic Nd6Fe13Ga phases, resulting in improved magnetic properties.
JOURNAL OF RARE EARTHS
(2022)
Article
Materials Science, Multidisciplinary
Mengjie Pan, Xiaolian Liu, Weiyang Jin, Song Fu, Enxiang Yang, Xianguo Liu, Lizhong Zhao, Xuefeng Zhang, Mi Yan
Summary: In this study, the corrosion resistance of Nd-Fe-B recycled magnets was improved by adding 0.3 wt% copper powder with an average grain size of 1 μm. The Cu-modified magnets showed significantly reduced mass loss in accelerated corrosion tests, which can be attributed to the change in crystal structure of the grain boundary phase after Cu modification.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Applied
Qingfang Huang, Qingzheng Jiang, Yao Shi, Sajjad Ur Rehman, Xing Wei, Ruoshu Wang, Yongjian Zhang, Deqin Xu, Dakun Chen, Zhenchen Zhong
Summary: It is not clear whether the efficiency of Tb substitution for increasing the coercivity in (Pr, Nd)-Fe-B sintered permanent magnets depends on different matrix phases and doping constituents. In this study, co-doping Ga and Cu elements were investigated to improve the efficiency of Tb substitution. It was found that Ga and Cu co-doping effectively increased the thermal stability and coercivity, resulting in a significant enhancement of magnetic properties. The effectiveness of Tb substitution is influenced by the presence of different matrix phases and doping constituents.
JOURNAL OF RARE EARTHS
(2023)
Article
Materials Science, Multidisciplinary
Jia Li, Shihui Li, Qingrong Yao, Weichao Huang, Jianqiu Deng, Jiang Wang, Guanghui Rao, Huaiying Zhou
Summary: The addition of Tb6Fe13Cu was found to significantly improve the intrinsic coercivity and corrosion resistance of Nd-Fe-B magnets, leading to the formation of a Tb-rich shell structure, optimization in distribution/morphology of intergranular phases, and stabilization of RE-rich phases.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
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)