Article
Chemistry, Physical
Shuhan Dong, Xiantao Li, Qingmei Lu, Weiqiang Liu, Yufeng Wu, Ming Yue
Summary: The efficient regeneration of sintered Nd-Fe-B rare earth magnets plays a crucial role in the recycling economy of rare earth resources. This study systematically investigated the mechanical properties of the original and recycled magnets and analyzed the chemical composition and microstructure to explain the mechanism. The main fracture mechanism of recycled magnets is intergranular fracture. The regenerated magnets have similar mechanical properties to the original magnets, fully meeting product requirements.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Chemical
J. Perez-Arbulu, N. Burgos, J. M. Martin, M. Martinez-Iturralde, I. Elosegui
Summary: Nd-Fe-B powders with different particle sizes were produced using gas atomization with helium and argon gases. Helium atomization resulted in finer powders compared to argon atomization. The powders exhibited a fine microstructure and excellent magnetic properties, making them suitable for various applications.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Polymer Science
Aleksandar Grujic, Dragutin Nedeljkovic, Jasna Stajic-Trosic, Mirko Z. Stijepovic, Sabla Alnouri, Srdjan Perisic
Summary: Polymer-bonded magnets combine the magnetic properties of metal particles with the molding capability of a polymeric matrix. This class of material has great potential for various industrial and engineering applications. Previous research has focused on mechanical, electrical, and magnetic properties as well as particle size and distribution. This study examines the impact toughness and magnetic behavior of synthesized Nd-Fe-B-epoxy composite materials with varying content of magnetic Nd-Fe-B particles.
Article
Materials Science, Multidisciplinary
K. Schafer, R. G. T. Fim, F. Maccari, T. Braun, S. Riegg, K. P. Skokov, D. Koch, E. Bruder, I. Radulov, C. H. Ahrens, P. A. P. Wendhausen, O. Gutfleisch
Summary: Nd-Fe-B bonded magnets are important for various technological applications. Additive Manufacturing allows the fabrication of net-shape bonded magnets with complex geometries, tailored for specific applications. This study presents a technique using Laser Powder Bed Fusion to fabricate anisotropic bonded magnets without the need for a magnetic field source.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Engineering, Manufacturing
Olivier Tosoni, Elisa Borges Mendonca, Joni Reijonen, Atte Antikainen, Lukas Schaefer, Stefan Riegg, Oliver Gutfleisch
Summary: Additive manufacturing (AM) is a promising method for efficiently utilizing rare-earth elements in complex-shaped magnets. This study developed a close-to-industrial process to produce a narrow-distributed Nd-Fe-B powder and used it to build magnets using powder bed fusion with laser beam. After optimization and annealing, the magnets displayed excellent magnetic properties.
ADDITIVE MANUFACTURING
(2023)
Article
Engineering, Manufacturing
Janez Slapnik, Irena Pulko, Rebeka Rudolf, Ivan Anzel, Mihael Bruncko
Summary: The study developed a new filament for bonded magnets based on thermoplastic polyurethane (TPU), which showed better magnetic performances and processability compared to a filament based on polyamide 12 (PA12). However, the PA12-based bonded magnets exhibited higher flexural modulus and stiffness at elevated temperatures. The study also found that the best magnetic properties were achieved with TPU filled with 92 wt% of Nd-Fe-B particles.
ADDITIVE MANUFACTURING
(2021)
Article
Chemistry, Physical
X. T. Li, W. Q. Liu, M. Yue, Y. H. Liu, S. S. Zha, X. F. Yi, D. T. Zhang, Q. M. Lu, H. G. Zhang
Summary: The high-temperature oxidation resistance is a critical evaluation index for the practical applications of Nd-Fe-B sintered magnets. In this study, the high-temperature oxidation behavior of recycled Nd-Fe-B sintered magnets was investigated and compared with the original magnets. The results show that recycled magnets negatively influence the high-temperature oxidation resistance compared with the original magnets.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Weisen Huang, Xuefeng Liao, Jiayi He, Hongya Yu, Zhongwu Liu
Summary: This study investigates and compares the microstructure, magnetic properties, thermal stability, corrosion resistance, and mechanical properties of bonded (La,Ce,Y)-Fe-B magnet with Nd-Fe-B and (Nd,La,Ce)-Fe-B magnets. The results show that bonded (La,Ce,Y)-Fe-B magnet exhibits a combination of magnetic properties with lower coercivity but higher performance-to-cost ratio compared to other magnets. It also demonstrates better thermal stability and corrosion resistance. The study suggests that bonded (La,Ce,Y)-Fe-B magnet has great potential for industrial applications.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Peihong Zhu, Min Liu, Yaxuan Yang, Weiqiang Liu, Qingmei Lu, Yue Ding, Baoguo Zhang, Hui Meng, Qifeng Wei, Ming Yue
Summary: The difficulty in recycling short-process bonded Nd-Fe-B magnet waste lies in removing the polymer matrix while protecting the magnetic powder. This study used a sodium hydroxide ethanol solution to destroy the polymer matrix and examined its effect on the magnetic powders. The nonmagnetic polymer matrix was successfully removed without damaging the magnetic phase, resulting in a significant decrease in carbon and oxygen contents while preserving most of the magnetic properties.
Article
Materials Science, Multidisciplinary
Julan Wu, Nesma T. Aboulkhair, Michele Degano, Ian Ashcroft, Richard J. M. Hague
Summary: Laser powder-bed fusion (L-PBF) technique offers excellent manufacturing freedom in additive manufacturing; the potential of combining Nd-Fe-B as a permanent magnet with L-PBF manufacturing capabilities opens up new possibilities for functional additive manufacturing in applications like electric machines; a parametric study on high density L-PBF Nd-Fe-B samples reveals correlations between part integrity and process parameters.
MATERIALS & DESIGN
(2021)
Article
Chemistry, Physical
Fugang Chen, Tieqiao Zhang, Yong Zhao, Xiaoli Wang, Caiping Jiang, Jinlu Chen, Wenqiang Zhao
Summary: The demagnetization field distribution of magnetized Nd-Fe-B magnet was quantitatively calculated and analyzed. Multilayered composite Nd-Fe-B magnets were designed and fabricated with specific coercivity gradient distributions lower than the demagnetization field gradient. It was found that the low coercivity interlayer magnets did not significantly decrease the overall magnetic properties, and effective self-bonding was observed between adjacent Nd-Fe-B magnets.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Electrical & Electronic
F. Bittner, J. Thielsch, W-G Drossel
Summary: The impact of laser powder bed fusion on the coercivity of Nd-lean commercial MQP (TM)-S powder was investigated. It was found that different processing parameters have a significant effect on the magnetic performance of LPBF-processed Nd-Fe-B permanent magnets. Increasing the energy input during manufacturing can increase the coercivity. Hatch spacing was identified as the major contribution to coercivity, and its role is discussed based on multiple re-melting events.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Chemistry, Physical
Z. H. Kautsar, H. Sepehri-Amin, Xin Tang, R. Iguchi, K. Uchida, T. Ohkubo, K. Hono
Summary: The resistivities of anisotropic Nd-Fe-B-based magnets were increased in parallel and perpendicular directions to the c-axis by hot-deforming Nd-Fe-B melt-spun flakes coated with DyF3 through electrophoretic deposition. As a result, the operating temperature under high-frequency AC magnetic field decreased by 20°C due to the reduction of eddy current loss. The formation of a resistive layer composed of NdF3 at the interface of original ribbons in the hot-deformed magnet was observed. The excess Dy diffused into the original ribbon flakes and formed a Dy-rich shell in Nd2Fe14B grains, resulting in a high coercivity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Multidisciplinary Sciences
Hui Meng, Guiping Tang, Abby Shen, Michelle Qian, Qifeng Wei, George Mizzell, Christina H. Chen
Summary: This study investigates the attraction and repulsion mechanisms of magnets of different sizes, finding that magnets with higher P-c can cause demagnetization in magnets with lower P-c, resulting in attraction. Additionally, for some NdFeB magnets, a repulsion may occur due to previous demagnetization and reversed polarity areas.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Physical
Mario Schoenfeldt, Urban Rohrmann, Philipp Schreyer, Mahmudul Hasan, Konrad Opelt, Juergen Gassmann, Anke Weidenkaff, Oliver Gutfleisch
Summary: The effects of multiple recycling of scrap magnets from magnetic resonance tomography devices were investigated. The changes in different material properties were studied, including chemical composition, impurity content, particle size, magnetic properties, microstructure, and degree of alignment. The recycling process led to a decrease in texture, orientation, and magnetic properties, as well as an increase in impurities and particle size. The addition of Nd hydride improved the properties, with 4 wt.% Nd hydride fully restoring the density of the recycled magnets. The recycled magnets met the specification of primary magnets and outperformed them in terms of sustainability and production cost reduction.
JOURNAL OF ALLOYS AND COMPOUNDS
(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)