Journal of Magnetism and Magnetic Materials最新文献_第5页

Multivariate magnetorheological fluid modeling based on Mason number

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-03-28 DOI: 10.1016/j.jmmm.2025.172957

Guo Peilin , L.v. Jingcheng , Wu Mingyu , Kuang Senyun , WEI Yintao , Wang Xin

引用次数: 0

Magnetic properties of (Mo2/3Dy1/3)2AlC arc melted polycrystalline samples

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-03-28 DOI: 10.1016/j.jmmm.2025.172992

Binod K. Rai , Christopher A. Mizzi , Alex Bretaña , Logan Breton , Catherine Housley , Destiny Ivy , Joshua Abbott , Boris Maiorov , Bhoj R. Gautam , Matthias Frontzek , Ram C. Rai , Stuart Calder

{"title":"Magnetic properties of (Mo2/3Dy1/3)2AlC arc melted polycrystalline samples","authors":"Binod K. Rai , Christopher A. Mizzi , Alex Bretaña , Logan Breton , Catherine Housley , Destiny Ivy , Joshua Abbott , Boris Maiorov , Bhoj R. Gautam , Matthias Frontzek , Ram C. Rai , Stuart Calder","doi":"10.1016/j.jmmm.2025.172992","DOIUrl":"10.1016/j.jmmm.2025.172992","url":null,"abstract":"<div><div>This study investigates the structural and magnetic properties of arc-melted (Mo<math><msub><mrow></mrow><mrow><mn>2</mn><mo>/</mo><mn>3</mn></mrow></msub></math>Dy<math><msub><mrow></mrow><mrow><mn>1</mn><mo>/</mo><mn>3</mn></mrow></msub></math>)<math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math>AlC polycrystalline samples, a member of the <math><mi>i</mi></math>-MAX phase family. Temperature-dependent magnetization and specific heat measurements confirm the low-temperature antiferromagnetic transitions around 14 K and 17 K. Neutron diffraction data collected at 4 K reveal the emergence of magnetic Bragg peaks that are not allowed in the paramagnetic space group <math><mrow><mi>C</mi><mn>2</mn><mo>/</mo><mi>c</mi></mrow></math>, further confirming the presence of antiferromagnetic ordering. The detection of a secondary phase, DyAl<math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math>, is complicated by overlapping Bragg peaks with the monoclinic phase of (Mo<math><msub><mrow></mrow><mrow><mn>2</mn><mo>/</mo><mn>3</mn></mrow></msub></math>Dy<math><msub><mrow></mrow><mrow><mn>1</mn><mo>/</mo><mn>3</mn></mrow></msub></math>)<math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math>AlC in powder XRD patterns. However, magnetization and neutron diffraction data suggest the presence of DyAl<math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math>, evidenced by a ferromagnetic phase transition around 62 K.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"624 ","pages":"Article 172992"},"PeriodicalIF":2.5,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143786109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Efficient design of non-contact magnetic induction-based energy harvesters from electromagnetic fields

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-03-26 DOI: 10.1016/j.jmmm.2025.172988

Bahram Rashidi

{"title":"Efficient design of non-contact magnetic induction-based energy harvesters from electromagnetic fields","authors":"Bahram Rashidi","doi":"10.1016/j.jmmm.2025.172988","DOIUrl":"10.1016/j.jmmm.2025.172988","url":null,"abstract":"<div><div>This paper presents the design and implementation of efficient non-contact magnetic induction-based energy harvesters utilizing various cores. Several cores are developed by adding a pair of ferrite magnetic flux collector parts to both ends of the rod core. This configuration enables the cores to guide more magnetic flux effectively. Exposing these cores to the magnetic flux enhances the energy harvesting rate. The proposed energy harvesters are based on non-contact coils with ferrite cores, so they do not need to be clamped around the conductor-an approach that often limits practical applications. Parameters such as the ability to charge a capacitor, the open-circuit voltage across the harvesters, and the output power are evaluated to assess the performance of the proposed structures. The results show that the structures meet acceptable specifications for practical requirements. Experimental results demonstrate the electrical output performance of the best proposed energy harvester (the <math><mo>○</mo></math>-shaped core) achieved a maximum open-circuit output voltage of 23.702 V and an output power of 1.994 mW under a magnetic field of 20 <math><mi>μ</mi></math>T. Since the presented non-contact energy harvesting structures are very simple and low-cost, the proposed method can be widely applied in power transmission, distribution, and smart grid systems.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"623 ","pages":"Article 172988"},"PeriodicalIF":2.5,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A system generating an impulse magnetic field with a closed magnetic circuit and a thyristor as a switching element

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-03-26 DOI: 10.1016/j.jmmm.2025.173003

Andrzej Skumiel , Rafał M. Wojciechowski

引用次数: 0

Analysis of the influence mechanism of CeFe2 phase on coercivity in high-performance Nd-Ce-Fe-B diffusion magnets

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-03-25 DOI: 10.1016/j.jmmm.2025.173001

Yuan Qin , Xiangming Wang , Lele Zhang , Min Fan , Jie Song , Gang Wang , Weiqiang Liu , Hao Chen , Penghao Yue , Zhibo Zhao , Zhanjia Wang , Yuqing Li , Ming Yue

{"title":"Analysis of the influence mechanism of CeFe2 phase on coercivity in high-performance Nd-Ce-Fe-B diffusion magnets","authors":"Yuan Qin , Xiangming Wang , Lele Zhang , Min Fan , Jie Song , Gang Wang , Weiqiang Liu , Hao Chen , Penghao Yue , Zhibo Zhao , Zhanjia Wang , Yuqing Li , Ming Yue","doi":"10.1016/j.jmmm.2025.173001","DOIUrl":"10.1016/j.jmmm.2025.173001","url":null,"abstract":"<div><div>In this study, we have prepared high-performance (Nd, Ce)-Fe-B magnets with 16.95 wt% and 23.73 wt% Ce / total rare earth (TRE) content, as well as Dy diffusion magnets. The concern between the CeFe2 phase, microstructure, and coercivity of the magnets was clarified. When the Ce / TRE content increased to 23.73 wt%, a little of the CeFe2 phase appeared in the magnet, which improved the fluidity of the liquid phase, promoted the formation of grain boundary phases (GBs), and optimized the microstructure. Therefore, when the GBs thickness increased to 6.39 nm, the coercivity slightly increased. However, in the subsequent heavy rare earth grain boundary diffusion, the coercivity increment (ΔHcj) of the magnet with the CeFe2 phase was 2.96 kOe, lower than the 4.68 kOe in the magnet without the CeFe2 phase. From theoretical calculations and experimental results, the diffusion channel of the Dy elements was blocked by the CeFe2 phase, and the Dy atom would enter the CeFe2 phase to form the (Ce, Dy)Fe2 phase. Therefore, the presence of the CeFe2 phase led to a smaller diffusion depth of Dy elements, less core–shell structure of the main phase, lower effective Dy utilization rate, and lower ΔHcj.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"623 ","pages":"Article 173001"},"PeriodicalIF":2.5,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143726302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental estimation of the remanent induction for the study of functional fatigue in permanent magnets

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-03-25 DOI: 10.1016/j.jmmm.2025.172965

Abderraouf Ouazib , Mathieu Domenjoud , Laurent Daniel

{"title":"Experimental estimation of the remanent induction for the study of functional fatigue in permanent magnets","authors":"Abderraouf Ouazib , Mathieu Domenjoud , Laurent Daniel","doi":"10.1016/j.jmmm.2025.172965","DOIUrl":"10.1016/j.jmmm.2025.172965","url":null,"abstract":"<div><div>The magnetization of new generation hard ferromagnetic materials is difficult to access experimentally without the use of advanced and expensive instruments. This article proposes two novel, easily implementable techniques for measuring the remanent induction of permanent magnets: a variant of the extraction method and a residual magnetic field method. Both methods are validated on hard Ferrites by comparison with hysteresis loop measurements taken as a reference measurement. The advantages and disadvantages of each method are discussed. Subsequently, the proposed techniques are applied to measure the remanent induction of rare-earth magnets, specifically Neodymium–Iron–Boron (Nd<img>Fe<img>B) and Samarium-Cobalt (Sm-Co). The obtained results exhibit consistency with manufacturer-provided data, attesting to the accuracy of the proposed measurement methodologies. Furthermore, the research investigates the effect of cyclic mechanical loading on the remanent induction of permanent magnets. The magnets are subjected to a set of 106 sinusoidal uniaxial compression cycles at a frequency of 30 Hz and at stress amplitudes representative for practical conditions in electrical machine applications. The remanent induction of the mechanically cycled magnets is subsequently measured. The investigation reveals no significant fatigue effect on the remanent induction in the studied hard materials. Overall, this study provides insights into the magneto-mechanical coupling effects in hard ferromagnetic materials and into the performance analysis of magnet properties under time-varying mechanical loadings.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"623 ","pages":"Article 172965"},"PeriodicalIF":2.5,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Critical behavior and anisotropic magnetocaloric effect in off-stoichiometric van der Waals ferromagnet Fe3-xGaTe2

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-03-24 DOI: 10.1016/j.jmmm.2025.172997

Yurong You , Jun Liu , Bei Ding , Feng Xu , ZhengMing Sun

{"title":"Critical behavior and anisotropic magnetocaloric effect in off-stoichiometric van der Waals ferromagnet Fe3-xGaTe2","authors":"Yurong You , Jun Liu , Bei Ding , Feng Xu , ZhengMing Sun","doi":"10.1016/j.jmmm.2025.172997","DOIUrl":"10.1016/j.jmmm.2025.172997","url":null,"abstract":"<div><div>The evolution of magnetic interactions, critical properties and magnetocaloric effects of off-stoichiometric room-temperature van der Waals Fe3-xGaTe2 are systematically investigated. Density functional theory (DFT) calculations reveal that the ferromagnetic exchange interactions between different Fe atoms play an important role in magnetic couplings and the change of Curie temperature TC. Moreover, the Fe vacancy in different sites can also significantly affect the TC. For Fe2.72GaTe2.01 single crystal, the critical exponents β of 0.474(3) and γ of 1.018(9) with TC at 336.7 K are obtained by the modified Arrott plot, whereas the critical exponent δ of 2.72(1) is yielded from a critical isotherm analysis at TC. The results of these critical exponents indicate that off-stoichiometric Fe2.72GaTe2.01 shows an approximate mean-field critical behavior. Furthermore, the exchange interaction distance decays as J ≈ r-4.53 proving the long-range ferromagnetism. In addition, the single crystal exhibits an anisotropic magnetocaloric behavior. The maximal value of the magnetic entropy change ΔSm reaches -1.7 (-1.0) J kg-1K−1 for a magnetic field change of 50 kOe in H//c axis (H//ab plane). Based on the field dependent ΔSm, the calculated critical exponent n is less than 2 at around TC, confirming a second-order type of the magnetic transition and reliability of the obtained critical exponents.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"623 ","pages":"Article 172997"},"PeriodicalIF":2.5,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143726303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Role of dextran decomposition process on the magnetite nanoparticles crystallization and magnetic hyperthermia effect

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-03-24 DOI: 10.1016/j.jmmm.2025.172999

Agnieszka Ciuraszkiewicz , Łukasz Hawełek , Piotr Gębara , Tymon Warski , Katarzyna Stan-Głowińska , Dariusz Łukowiec , Aleksandra Kolano-Burian , Joanna Wojewoda-Budka , Adrian Radoń

{"title":"Role of dextran decomposition process on the magnetite nanoparticles crystallization and magnetic hyperthermia effect","authors":"Agnieszka Ciuraszkiewicz , Łukasz Hawełek , Piotr Gębara , Tymon Warski , Katarzyna Stan-Głowińska , Dariusz Łukowiec , Aleksandra Kolano-Burian , Joanna Wojewoda-Budka , Adrian Radoń","doi":"10.1016/j.jmmm.2025.172999","DOIUrl":"10.1016/j.jmmm.2025.172999","url":null,"abstract":"<div><div>Magnetite nanoparticles (MNPs) are constantly studied in various biomedical applications, including magnetically-induced hyperthermia. This study tested the role of the dextran decomposition process on the MNPs crystallization and magnetic hyperthermia effect. It was confirmed that the modification of the synthesis method (medium and the procedure of the dextran introduction) results in the synthesis of magnetite nanoparticles with an average crystallite size from 3.88 ± 1.38 to 45.97 ± 0.76 nm and different magnetic properties. It was possible to synthesize nanoparticles with superparamagnetic properties (magnetization of 54.26 emu g−1 and coercivity of 0.36 Oe) as well as a sample with a higher coercivity equal to 19.26 Oe and magnetization equal to 51.35 emu g−1. The changes in the structure, morphology, and magnetic properties reflect the applicability potential of the magnetite nanoparticles in magnetic hyperthermia. The highest effect was observed for the sample synthesized in benzyl ether in the presence of dextran 40000. For a concentration of 0.25 mg ml−1, the specific absorption rate (SAR) was even higher than 200 W g−1. However, as shown, the SAR parameter is insufficient to analyze the applicability potential, and the temperature increase must be consequently analyzed. For a concentration of 0.25 mg ml−1, the temperature change was equal to 8.83 ± 1.03℃, while for 2 mg ml−1 to 21.20 ± 0.83 ℃.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"623 ","pages":"Article 172999"},"PeriodicalIF":2.5,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143726301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Automatic eigenvalue method in micromagnetic and atomistic simulations

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-03-24 DOI: 10.1016/j.jmmm.2025.172989

Xintao Fan , Shichao Zhang , Weiwei Wang , Lingyao Kong , Youmin Guo , Yizhou Liu , Haifeng Du

引用次数: 0

Spin-reorientation and phase diagram for a ferrimagnet with compensation point in inclined magnetic field

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-03-22 DOI: 10.1016/j.jmmm.2025.172968

D.O. Ignatyeva , N.A. Gusev , A.K. Zvezdin , V.I. Belotelov

引用次数: 0