Article
Materials Science, Multidisciplinary
Yu-Yang Bian, Shu-Qiang Guo, Yu-Ling Xu, Kai Tang, Xiong-Gang Lu, Wei-Zhong Ding
Summary: A high-temperature pyrometallurgical process was developed to recover valuable rare earth elements from Nd-Fe-B permanent magnet scraps. By pulverizing and oxidizing the magnet scraps, the rare earth elements were extracted as oxides while separating Fe and B as metal phase. Temperature and reaction time were found to be crucial for improving the purity of rare earth oxides.
Article
Chemistry, Physical
Akihide Hosokawa, Wataru Yamaguchi, Kazuyuki Suzuki, Kenta Takagi
Summary: High performance Sm-Fe-N fine powders were produced through jet-milling technique under low oxygen atmosphere, showing deteriorated crystallinity with decrease in particle size due to the formation of nanocrystalline regions and dislocations. These nanocrystalline regions negatively affected the alignment degree of the powder batch, leading to degradation in saturation magnetization and (BH)(max).
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Junying Jiang, Yong Wu, Hongguo Chen, Zhuqing Wan, Ding Ding, Lei Xia, Xiaolong Guo, Peng Yu
Summary: In this study, an annealing +CV-activation integrated strategy was developed to treat a free-standing NiFeBSiP ribbon as an efficient and stable oxygen-evolving electrode. The strategy induced nanocrystallization and oxidation effects on the surface of the ribbon, significantly improving electron transfer ability, oxidation state, and surface area, thereby enhancing the oxygen evolution reaction (OER) performance.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Physics, Applied
Minyeong Choi, Yang-Ki Hong, Hoyun Won, Gary J. Mankey, Chang-Dong Yeo, Woncheol Lee, Myung-Hwa Jung, Taegyu Lee, Jong-Kook Lee
Summary: The study demonstrates that rare-earth free ferromagnetic MnBi exhibits a positive temperature coefficient of coercivity, but undergoes a structural phase transformation at high temperatures. By controlling the positioning of copper occupancy, it is possible to effectively suppress Mn diffusion and raise the temperature of the phase transformation.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Jean-Marie Poumirol, Adrien Bercher, Tetiana Slipchenko, Ivan Maggio-Aprile, Christoph Renner, Alexey B. Kuzmenko
Summary: The compact bicomponent-permanent-magnet design presented in this study is capable of generating a high magnetic field in a small volume while limiting the stray field, making it suitable for retrofitting existing experiments in diverse environments and applications.
PHYSICAL REVIEW APPLIED
(2021)
Article
Nanoscience & Nanotechnology
Qiong Wu, Xiangyu Ma, Ming Yue, Liying Cong, Zhenhui Ma, Dongtao Zhang, Yuqing Li, Yatao Wang
Summary: Specially designed SmCo5/Co magnetic nanocomposites were fabricated by a bottom-up process, showing high magnetic performance with bi-anisotropic properties.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Applied
Patrick Pan, T. J. Hayward
Summary: This study investigated the giant magnetoimpedance (GMI) and giant stress impedance (GSI) behaviors of amorphous ribbons made of three commercially available materials under longitudinal stress/strain. The linearity of the ribbons' GSI responses and gauge factors was measured to compare their stress/strain sensing performance. The study found that different materials exhibited different performances for different strains, which were dependent on the saturation magnetostriction constants ( lambda s ) and Young's moduli (E) of the materials.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Crystallography
Artem Fuks, Galina Abrosimova, Oleg Aksenov, Margarita Churyukanova, Alexandr Aronin
Summary: The early stages of nanocrystallization in amorphous Fe73.8Si13B9.1Cu1Nb3.1 ribbons and microwires were compared, and it was revealed that microwires exhibit faster nanocrystallization than ribbons, which can be attributed to the presence of strong compressive surface stress and tensile stress in microwires.
Article
Materials Science, Multidisciplinary
Minkyu Kang, Hansol Lee, Jihoon Park, Jongryoul Kim
Summary: This study optimized the composition of Mn-Bi alloy and investigated the effects of Sb substitution on the magnetic properties. The results showed that Sb substitution had positive effects on the magnetic properties, leading to an increase in coercivity, remanent magnetization, and maximum energy product. The microstructure analysis revealed a decrease in grain size, which further enhanced the magnetic properties. The temperature dependence of coercivity also showed significant enhancement, suggesting the potential application of Mn-Bi alloy in electrical vehicles.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Alena Vishina, O. Eriksson, H. C. Herper
Summary: A high-throughput and data-mining search has been conducted to find rare-earth-free permanent magnets using materials containing a 3d and p-element of the Periodic Table. Three promising compounds, Fe 2 C, Mn2MoB4, and Mn2WB4, have been investigated in detail and suggested as potential candidates for applications as permanent magnets. Doping protocols have also been explored for these systems.
MATERIALS RESEARCH LETTERS
(2023)
Article
Energy & Fuels
Chaelim Jeong, Luca Cinti, Nicola Bianchi
Summary: This paper discusses the possibility of replacing rare-earth permanent magnet motors in direct drive applications, comparing the strengths and weaknesses of various alternatives. Specifically, the demagnetization phenomenon of motors with Ferrite PMs is deeply analyzed.
Article
Chemistry, Physical
A. Oraon, T. Adhikary, M. Tirugabathina, B. Kumar, S. Ghosh, S. Aich
Summary: The effect of Boron (B) and Silicon (Si) addition on the hard magnetic properties of rapidly quenched Zr-Co ribbons was investigated. It was found that the addition of small amounts of Boron effectively reduces the grain size and significantly increases coercivity. On the other hand, the introduction of Silicon increases the coercivity but slightly decreases the magnetization. The annealing temperature above 650 degrees C leads to an increase in the soft magnetic phases and a decrease in the hard magnetic phase. The Co79Zr13V5B1Si2 ribbons annealed at 650 degrees C showed the highest coercivity (6.14 kOe) and magnetic energy product (6.14 MGOe) with fine and uniform grain structure.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Xin Tang, J. Li, A. K. Srinithi, H. Sepehri-Amin, T. Ohkubo, K. Hono
Summary: The study found that the addition of V element has a significant impact on coercivity, and the ThMn 12-type structure can be stabilized in SmxFe11TiV ribbons, while the coercivity can be significantly increased in optimally-annealed ribbons.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Multidisciplinary
Chuanying Liu, Qibin Yan, Xingwang Zhang, Lecheng Lei, Chengliang Xiao
Summary: This study developed a green and facile one-pot leaching-extraction process for recovering rare earth elements from NdFeB permanent magnets. The process showed high separation selectivity and great potential for application in rare-earth recovery.
CHINESE CHEMICAL LETTERS
(2022)
Article
Engineering, Multidisciplinary
Ya Li, Qinglin Zhou, Shichuan Ding, Wei Li, Jun Hang
Summary: This article investigates the feasibility of interior consequent-pole permanent magnet (ICPM) machines with reduced rare-earth magnet consumption for automotive applications. A new ICPM machine with a double-layer V-shaped permanent magnet (PM) arrangement is proposed and compared with a commercial Nissan Leaf interior PM (IPM) machine. The electromagnetic performances, rotor mechanical strength, and PM utilization ratio of the proposed ICPM machine are evaluated by finite-element (FE) simulation, and it shows promising results.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2023)
Article
Nanoscience & Nanotechnology
A. Perez-Checa, D. Musiienko, A. Saren, A. Soroka, J. Feuchtwanger, A. Sozinov, J. M. Barandiaran, K. Ullakko, V. A. Chernenko
SCRIPTA MATERIALIA
(2019)
Article
Chemistry, Physical
A. M. Schonhobel, R. Madugundo, A. M. Gabay, J. M. Barandiaran, G. C. Hadjipanayis
JOURNAL OF ALLOYS AND COMPOUNDS
(2019)
Review
Engineering, Multidisciplinary
G. C. Hadjipanayis, A. M. Gabay, A. M. Schonhobel, A. Martin-Cid, J. M. Barandiaran, D. Niarchos
Article
Nanoscience & Nanotechnology
Vasileios Alexandrakis, Jose Manuel Barandiaran, Anabel Perez-Checa, Patricia Lazpita, Peer Decker, Steffen Salomon, Jorge Feuchtwanger, Alfred Ludwig, Volodymyr Chernenko
SCRIPTA MATERIALIA
(2020)
Article
Materials Science, Multidisciplinary
B. Zang, R. Parsons, K. Onodera, H. Kishimoto, T. Shoji, A. Kato, J. S. Garitaonandia, A. C. Y. Liu, K. Suzuki
PHYSICAL REVIEW MATERIALS
(2020)
Article
Materials Science, Multidisciplinary
A. Aubert, R. Madugundo, A. M. Schonhobel, D. Salazar, J. S. Garitaonandia, J. M. Barandiaran, G. Hadjipanayis
Article
Materials Science, Multidisciplinary
S. Kobayashi, A. Martin-Cid, K. Toyoki, H. Okazaki, S. Kawaguchi, S. Hirosawa, T. Nakamura
PHYSICAL REVIEW MATERIALS
(2020)
Article
Chemistry, Physical
Jia Yan Law, Luis M. Moreno-Ramirez, Alvaro Diaz-Garcia, Andres Martin-Cid, Shintaro Kobayashi, Shogo Kawaguchi, Tetsuya Nakamura, Victorino Franco
Summary: The Mn22.3Fe22.2Ni22.2Ge16.65Si16.65 HEA in high-entropy alloys shows a significant improvement in isothermal entropy change, which is the largest reported to date for rare earth-free HEAs, indicating promising potential as high-performance magnetocaloric materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
I Unzueta, J. Lopez-Garcia, V Sanchez-Alarcos, V Recarte, J. Perez-Landazabal, J. A. Rodriguez-Velamazan, J. S. Garitaonandia, J. A. Garcia, F. Plazaola
Summary: The influence of Co addition and internal stress on atomic level magnetism in Ni-Mn-Sn alloys was studied. Results showed that the singlet component could be tracked under a wider range of conditions, with conclusions drawn regarding the transfer of dipolar field and the sensitivity of Sn Mossbauer probe atoms to slight microstructural distortions.
Article
Chemistry, Physical
Shintaro Kobayashi, Taichi Abe, Andres Martin-Cid, Shogo Kawaguchi, Motohiro Suzuki, Satoshi Hirosawa, Tetsuya Nakamura
Summary: A new sample mounting method was used to determine the crystalline phase diagram of a Nd-Fe-B-Cu sintered magnet, showing temperature-reversible changes and thermodynamic equilibrium phenomena. The measurements confirmed the thermodynamic database constructed for CALPHAD calculations in the Nd-Fe-B-Cu-O system.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
A. Martin-Cid, T. Kawahara, S. Kobayashi, K. Toyoki, D. Billington, Y. Kotani, H. Kubo, Y. Une, T. Iriyama, M. Sagawa, T. Nakamura
Summary: The demagnetization process of Nd-Fe-B-based magnets produced using different manufacturing techniques was studied using soft X-ray magnetic circular dichroism microscopy. The study found that the coercivity of the HDDR processed magnet is lower than the magnets produced with N2 jet-milled powder, even though the grain size is smaller. Additionally, it was observed that in the HDDR processed magnet, nucleation of individual grains occurs before the reversed magnetic domains propagate.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Multidisciplinary Sciences
Xin Tang, H. Sepehri-Amin, N. Terada, A. Martin-Cid, I Kurniawan, S. Kobayashi, Y. Kotani, H. Takeya, J. Lai, Y. Matsushita, T. Ohkubo, Y. Miura, T. Nakamura, K. Hono
Summary: The authors demonstrate a series of materials with a large and reversible magnetocaloric effect, suitable for the full temperature range required for hydrogen liquefaction. By eliminating the magneto-structural phase transition, the giant magnetocaloric effect becomes reversible.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
S. Kobayashi, Y. K. Takahashi, K. Ishigami, Y. Kotani, M. Suzuki, T. Yoshioka, H. Tsuchiura, H. Sepehri-Amin, T. Ohkubo, S. Hirosawa, T. Nakamura
Summary: This study focused on the effects of Zr substitution for Sm in (Sm1-xZrx)(Fe0.8Co0.2)(12) single-crystalline films on their structural and magnetic properties. The results showed that Zr selectively occupied the Sm site without disturbing the Fe sublattices. Electron transfer from Zr to the Fe band increased the magnetic moment and magnetic interactions in the Fe8f site, leading to magnetization enhancement in (Sm1-xZrx)(Fe0.8Co0.2)(12) single-crystalline films.
Article
Physics, Applied
B. Sisniega, J. Gutierrez, J. M. Barandiaran, J. M. Porro, A. Garcia-Arribas
Summary: The phenomenon of magnetic relaxation in amorphous ferromagnetic alloys can cause uncontrolled time evolution of magnetization, leading to serious issues in sensor applications. This study investigates the influence of magnetic relaxation on the performance of an amorphous ferromagnetic ribbon as the main component of a magnetoelastic resonance (MER)-based sensor at room temperature. The time evolution was observed by monitoring the changes in the MER signal, particularly the variation in resonance frequency fr.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
M. Blinov, V Chernenko, V. N. Prudnikov, I. R. Aseguinolaza, J. M. Barandiaran, E. Lahderanta, A. B. Granovsky
