Journal of Magnetism and Magnetic Materials最新文献_第9页

XXZ-type interlayer exchange interaction in the bilayer triangular-lattice system as a source of multiple skyrmion phases

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-02-20 DOI: 10.1016/j.jmmm.2025.172876

Satoru Hayami

引用次数: 0

Magnetic properties and magnetocaloric effect in Tb2CoCrO6 oxide

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-02-20 DOI: 10.1016/j.jmmm.2025.172897

Jinyi Wang , Ran Ji , Jiameng Xu , Zhuoning Li , Yikun Zhang , Lingwei Li

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Corrosion resistance of Al2O3/Cr composite coating on sintered NdFeB magnet

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-02-20 DOI: 10.1016/j.jmmm.2025.172895

Z.H. Rao, J.L. Xu, X.H. Zhang, J. Huang, J.M. Zhang, J.M. Luo

{"title":"Corrosion resistance of Al2O3/Cr composite coating on sintered NdFeB magnet","authors":"Z.H. Rao, J.L. Xu, X.H. Zhang, J. Huang, J.M. Zhang, J.M. Luo","doi":"10.1016/j.jmmm.2025.172895","DOIUrl":"10.1016/j.jmmm.2025.172895","url":null,"abstract":"<div><div>To improve the corrosion resistance of sintered NdFeB magnets, a composite coating of Al<sub>2</sub>O<sub>3</sub>/Cr was applied to the surface of the magnet using a combination of cathodic plasma electrolytic deposition (CPED) and double glow plasma deposition techniques. The morphologies of the surface and fractured cross-section, as well as the phase composition and corrosion resistance of the composite coatings, were examined through SEM, XRD, accelerated corrosion immersion test, and electrochemical tests, respectively. The influence of the composite coating on the magnetic characteristics of sintered NdFeB magnet was also evaluated. The results show that the Al<sub>2</sub>O<sub>3</sub> intermediate layer is completely covered by the Cr coating and the interface between the Al<sub>2</sub>O<sub>3</sub> layer and the Cr layer forms a mechanical interlocking effect. The surface of the Al<sub>2</sub>O<sub>3</sub>/Cr coating exhibits a hump cellular-like structure with the preferred orientation of Cr (200) plane. Compared with uncoated NdFeB magnet, the maximum magnetic energy product of the Al<sub>2</sub>O<sub>3</sub>/Cr composite coated sample decreases by 11.1 %. In the sulfuric acid immersion test, the weight loss of the Al<sub>2</sub>O<sub>3</sub>/Cr coated sample is only 15.04 % of that of the uncoated sample. The Al<sub>2</sub>O<sub>3</sub>/Cr coated NdFeB sample also demonstrates superior corrosion resistance compared to both the uncoated and Cr coated samples in the electrochemical tests. The Al<sub>2</sub>O<sub>3</sub>/Cr composite coating provides a new strategy for improving the corrosion resistance of sintered NdFeB magnets.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"619 ","pages":"Article 172895"},"PeriodicalIF":2.5,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474620","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

Influence of Al or Cr substitution on structure and magnetic properties of barium hexaferrites prepared by hydrothermal method

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-02-20 DOI: 10.1016/j.jmmm.2025.172896

A.Yu. Mironovich , V.G. Kostishin , H.I. Al-Khafaji , E.S. Savchenko , A.I. Ril , R.I. Shakirzyanov , M.A. Sysoev

{"title":"Influence of Al or Cr substitution on structure and magnetic properties of barium hexaferrites prepared by hydrothermal method","authors":"A.Yu. Mironovich , V.G. Kostishin , H.I. Al-Khafaji , E.S. Savchenko , A.I. Ril , R.I. Shakirzyanov , M.A. Sysoev","doi":"10.1016/j.jmmm.2025.172896","DOIUrl":"10.1016/j.jmmm.2025.172896","url":null,"abstract":"<div><div>In this study, BaFe<sub>12-x</sub>Cr<sub>x</sub>O<sub>19</sub> and BaFe<sub>12-x</sub>Al<sub>x</sub>O<sub>19</sub> (x = 0.0, 0.1, 0.3 and 0.4) powders were prepared by a hydrothermal method followed by annealing. The incorporation of Cr and Al in the hexaferrite structure was confirmed by elemental analysis and the results of Rietveld refinement of X-ray diffraction patterns, which revealed a decrease in the lattice volume with increasing x. Based on Mössbauer spectroscopy and magnetic measurements, the lack of Fe<sup>3+</sup> was observed in the 12k site for BaFe<sub>12-x</sub>Al<sub>x</sub>O<sub>19</sub> samples and in the 12k, 4f<sub>1</sub> and 4f<sub>2</sub> sites for BaFe<sub>12-x</sub>Cr<sub>x</sub>O<sub>19</sub> samples. With increasing substitution, the magnetic parameters of Al-substituted hexaferrites varied slightly, possibly due to limited incorporation of Al<sup>3+</sup>. At the same time, a significant decrease in H<sub>c</sub> was observed for Cr-substituted samples (5629 Oe for x = 0 and 2092 Oe for x = 0.4). Electron microscopy revealed that the substitution of Fe<sup>3+</sup> with Al<sup>3+</sup> had no significant effect on crystallite morphology. The substitution of Fe<sup>3+</sup> with Cr<sup>3+</sup> leads to the thinning and widening of the plate-like grains of hexaferrite. This could be one of the reasons for the decrease in coercivity.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"619 ","pages":"Article 172896"},"PeriodicalIF":2.5,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143463347","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

The pulse magnetic field method for measuring magnetization curves of silicon steel under highly saturated state

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-02-20 DOI: 10.1016/j.jmmm.2025.172873

Xiang Zhao, Yapeng Jiang, Yu Wang, Junquan Chen

{"title":"The pulse magnetic field method for measuring magnetization curves of silicon steel under highly saturated state","authors":"Xiang Zhao, Yapeng Jiang, Yu Wang, Junquan Chen","doi":"10.1016/j.jmmm.2025.172873","DOIUrl":"10.1016/j.jmmm.2025.172873","url":null,"abstract":"<div><div>Silicon steel in high power density motors typically operates at high saturation points (above 2 T). However, existing magnetic measurement methods currently struggle to accurately measure the characteristics under highly saturated conditions. Therefore, this paper proposes a Pulse Magnetic Field (PMF) method, which generates a sufficient excitation magnetic field to measure the magnetic properties of silicon steel under highly saturated states. Firstly, the feasibility of the method is proved by principle and simulation. Secondly a signal processing method is proposed to solve the noise, zero drift, and localization. Then the experiments show that the PMF method can generate a magnetic field of over 1,40,000 A/m, causing the silicon steel to reach a high saturation state, over 2 T. Finally, the effect of capacitance value on the measurement of the intrinsic magnetization curve is explored. The test results show that the PMF method can quickly and accurately measure the intrinsic magnetization curve of silicon steel materials under high saturation. Compared with the existing method, the error is about 1 %.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"620 ","pages":"Article 172873"},"PeriodicalIF":2.5,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143521149","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

Preparation of highly stable magnetic fluid and analysis of dynamic sealing characteristics of large-diameter eccentric shafts

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-02-19 DOI: 10.1016/j.jmmm.2025.172893

Xiude Yi , Buhe Bateer , Feihu Zhang , Qiuyang Guo

引用次数: 0

Improvement of the spin-valley polarization and tunneling magnetoresistance in magnetic silicene superlattices by means of aperiodic Kolakoski order

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-02-18 DOI: 10.1016/j.jmmm.2025.172871

J.G. Rojas-Briseño, P. Villasana-Mercado, S. Molina-Valdovinos, R. Rodríguez-González, I. Rodríguez-Vargas

{"title":"Improvement of the spin-valley polarization and tunneling magnetoresistance in magnetic silicene superlattices by means of aperiodic Kolakoski order","authors":"J.G. Rojas-Briseño, P. Villasana-Mercado, S. Molina-Valdovinos, R. Rodríguez-González, I. Rodríguez-Vargas","doi":"10.1016/j.jmmm.2025.172871","DOIUrl":"10.1016/j.jmmm.2025.172871","url":null,"abstract":"<div><div>Aperiodic order is quite relevant in science and technology. The aperiodic order is characterized by the so-called aperiodic sequences. Among the most important sequences we can find the Fibonacci, Thue–Morse, and Cantor sequences. The Thue–Morse and Cantor sequence have been instrumental in improving the spin-valley polarization and tunneling magnetoresistance (TMR) of magnetic silicene superlattices (MSSLs). Here, we study the impact of aperiodic Kolakoski order on the spin-valley polarization and TMR of MSSLs. The spin-valley polarization and TMR of Kolakoski (K-) MSSLs are compared with the ones of periodic (P-), Thue–Morse (TM-), and Cantor (C-) MSSLs. We find that the higher degree of disorder of the Kolakoski sequence reduces the total conductance of the antiparallel magnetization configuration, resulting in an effective enhancement of the TMR. Also, the aperiodic Kolakoski order gives rise to energy regions of two well-defined spin-valley polarization states accessible by switching the magnetization direction. The aperiodic Kolakoski order in conjunction with structural asymmetry can optimize the spin-valley polarization and TMR of MSSLs. The spin-valley polarization and TMR capabilities of K-MSSLs are superior than the ones of P-, TM-, and C-MSSLs.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"619 ","pages":"Article 172871"},"PeriodicalIF":2.5,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143463348","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

Temperature dependence of spin-polarization in FIS graphene junction

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-02-17 DOI: 10.1016/j.jmmm.2025.172870

Hamidreza Emamipour

{"title":"Temperature dependence of spin-polarization in FIS graphene junction","authors":"Hamidreza Emamipour","doi":"10.1016/j.jmmm.2025.172870","DOIUrl":"10.1016/j.jmmm.2025.172870","url":null,"abstract":"<div><div>We study the effect of temperature on spin polarization in graphene-based ferromagnet insulator superconductor (FIS) junctions, theoretically. Within the framework of BTK (Blonder Tinkham Klapwijk) theory we find that when <span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>F</mi></mrow></msub></math></span> is selected near to <span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>x</mi></mrow></msub></math></span> (where <span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>F</mi></mrow></msub></math></span> and <span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>x</mi></mrow></msub></math></span> represent Fermi energy and exchange field in the ferromagnet region) and temperature approaches to <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> spin-polarization gets 100%. This case implies the spin-polarization is generated by just one spin species i.e. spin-up current, (<span><math><msub><mrow><mi>I</mi></mrow><mrow><mi>u</mi></mrow></msub></math></span>). We also obtain a phase diagram <span><math><mrow><msub><mrow><mi>E</mi></mrow><mrow><mi>x</mi></mrow></msub><mo>−</mo><mi>T</mi></mrow></math></span> which distinguishes SAR (specular Andreev reflection) from NAR (normal Andreev reflection). Therefore, the proposed junction may be applied not only to create huge spin-polarization which is significant in spintronic-industry but also to discriminate SAR and NAR from each other which is important in fundamental condensed matter physics.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"618 ","pages":"Article 172870"},"PeriodicalIF":2.5,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437262","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

Open static magnetic cloak based on DC magnetic metamaterials

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-02-16 DOI: 10.1016/j.jmmm.2025.172885

Yangrong Chen , Hanchuan Chen , Fei Sun , Yichao Liu , Xiaoxiao Wu , Haitao Li , Zhixing Zhang , Qianhan Sun

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The role of W seed and spacer layers on the magnetic properties of Co/Pt multilayers

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-02-16 DOI: 10.1016/j.jmmm.2025.172869

M. Tokaç , H. Pişkin , G. Ekinci , B. Özkal , S. Kazan

{"title":"The role of W seed and spacer layers on the magnetic properties of Co/Pt multilayers","authors":"M. Tokaç , H. Pişkin , G. Ekinci , B. Özkal , S. Kazan","doi":"10.1016/j.jmmm.2025.172869","DOIUrl":"10.1016/j.jmmm.2025.172869","url":null,"abstract":"<div><div>The selection of seed and spacer layers is critical in influencing the magnetic properties of thin films, where these layers impact the microstructure, interface quality, and overall magnetic behavior of the thin films. The magnetic properties of Co/Pt multilayers have been investigated where the choice of seed and spacer layers is crucial for tailoring their magnetic properties. These layers influence the interfacial structure, and electronic environment, all of which contribute to variations in the effective demagnetizing field, g-factor, saturation magnetization, and perpendicular surface anisotropy constants. Ferromagnetic resonance has been used to investigate the enhancement of the Gilbert damping parameter, where the damping parameter is higher for the Cu/Co/Pt multilayers across the entire Co thickness range. In contrast, the presence of W layers on both sides of the Co layer leads to a reduction in the damping parameter. The higher spin-mixing conductance in the Co/Pt structure is linked to stronger SOC and enhanced orbital hybridization at the Co/Pt interface. As a consequence of their effects on spin–orbit interactions, spin-pumping efficiency, and interfacial quality, our results emphasize the critical role that interface characteristics play in improving damping in Co/Pt systems.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"618 ","pages":"Article 172869"},"PeriodicalIF":2.5,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437263","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