Journal of Magnetism and Magnetic Materials最新文献

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Machine learning investigation of chemical disorder effects in 24-valence-electron full-Heusler alloys with single magnetic element 单磁性24价电子全heusler合金化学无序效应的机器学习研究
IF 2.5 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-07-04 DOI: 10.1016/j.jmmm.2025.173322
Yanqi Guo , Chaokun Guo , Yuanji Xu , Bing Zheng , Xiaodong Ni , Fuyang Tian
{"title":"Machine learning investigation of chemical disorder effects in 24-valence-electron full-Heusler alloys with single magnetic element","authors":"Yanqi Guo ,&nbsp;Chaokun Guo ,&nbsp;Yuanji Xu ,&nbsp;Bing Zheng ,&nbsp;Xiaodong Ni ,&nbsp;Fuyang Tian","doi":"10.1016/j.jmmm.2025.173322","DOIUrl":"10.1016/j.jmmm.2025.173322","url":null,"abstract":"<div><div>Most full-Heusler alloys exhibit disordered structures such as B2 or BCC, rather than the ideal ordered <span><math><msub><mrow><mi>L2</mi></mrow><mrow><mn>1</mn></mrow></msub></math></span> or XA structures. It is urgent to explore the intrinsic relationship between magnetism and chemical disorder in these materials. In this study, we combine first-principles calculations and machine learning methods to investigate the influence of chemical disorder on the magnetism of 24-valence-electron X<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>YZ-type alloys. By screening stable compounds containing magnetic elements, we constructed a multidimensional feature set. The gradient boosting machine and random forest were used to establish classification and regression models, respectively. The results indicate that whether X or Y is a magnetic element, the degree of disorder is a key factor determining their magnetic properties. Using the proposed scheme, we successfully predict the magnetic properties of three unstudied compounds—Fe<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>HfSn, Fe<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>YSb, and Co<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>LiAs—achieving an <span><math><msup><mrow><mi>R</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span> value as high as 0.97, compared to <span><math><mrow><mi>a</mi><mi>b</mi></mrow></math></span> <span><math><mrow><mi>i</mi><mi>n</mi><mi>i</mi><mi>t</mi><mi>i</mi><mi>o</mi></mrow></math></span> calculations.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173322"},"PeriodicalIF":2.5,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144569934","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
Design, synthesis, characterization and biological evaluation of cobalt-ferrite nanoparticles for biomedical applications 生物医学应用钴铁氧体纳米粒子的设计、合成、表征和生物学评价
IF 2.5 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-07-02 DOI: 10.1016/j.jmmm.2025.173336
Ecem Fatma Esmer, Eyüp Bilgi, Selin Çeşmeli Dincay, Tuğçe Sakallı, Ceyda Öksel Karakuş
{"title":"Design, synthesis, characterization and biological evaluation of cobalt-ferrite nanoparticles for biomedical applications","authors":"Ecem Fatma Esmer,&nbsp;Eyüp Bilgi,&nbsp;Selin Çeşmeli Dincay,&nbsp;Tuğçe Sakallı,&nbsp;Ceyda Öksel Karakuş","doi":"10.1016/j.jmmm.2025.173336","DOIUrl":"10.1016/j.jmmm.2025.173336","url":null,"abstract":"<div><div>Cobalt-Ferrite nanoparticles (CF NPs) are increasingly used in biomedical applications due to their unique magnetic properties and biocompatibility. In this study, CF NPs were synthesized via co-precipitation, both in the presence and absence of oleic acid (OA) as a surfactant. Plackett-Burman Design was employed to study the influence of reaction conditions on the particle size distribution of bare and OA-coated CF NPs. Representative bare and OA-coated CF NP samples were characterized for morphology, composition, thermal stability, and optical and magnetic properties using TEM, XRD, FTIR, TGA, UV–Vis, and VSM. The highest saturation magnetization value (∼44 emu/g) was observed for bare CF NPs of smaller sizes. MTT assay results indicated that none of the tested samples showed significant cytotoxicity at the concentrations tested (1, 10, and 100 µg/mL), except for the bare CF NPs, which reduced viability of A549 cells to approximately 50 % following 72-hour exposure at 100 µg/mL. Following incubation in a cell culture medium for 48 h, proteins bound to the surface of CF NPs were analyzed using SDS-PAGE, revealing <em>bovine serum albumin</em>, <em>apolipoprotein A-I</em> and <em>fibronectin</em> as the most abundant proteins across samples. Overall, OA-coating slightly improved colloidal stability and reduced cytotoxicity, without significantly compromising the magnetic or protein-binding properties.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173336"},"PeriodicalIF":2.5,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144556718","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
Reconfigurable ferrimagnetic Tb/Co based substrates for magnetophoresis 磁泳用可重构铁磁Tb/Co基衬底
IF 2.5 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-07-02 DOI: 10.1016/j.jmmm.2025.173312
Maciej Urbaniak, Daniel Kiphart, Michał Matczak, Piotr Kuświk
{"title":"Reconfigurable ferrimagnetic Tb/Co based substrates for magnetophoresis","authors":"Maciej Urbaniak,&nbsp;Daniel Kiphart,&nbsp;Michał Matczak,&nbsp;Piotr Kuświk","doi":"10.1016/j.jmmm.2025.173312","DOIUrl":"10.1016/j.jmmm.2025.173312","url":null,"abstract":"<div><div>Magnetic patterns are utilized for the topologically protected transport of superparamagnetic colloids. We employ a 30 keV <span><math><msup><mrow><mi>Ga</mi></mrow><mrow><mo>+</mo></mrow></msup></math></span> focused ion beam with two distinct ion doses to pattern Tb/Co multilayers into structures with magnetic configurations which can be reconfigured with a pulse of a strong external magnetic field. Weak, homogeneous magnetic fields oscillating at several Hertz are superimposed on the local magnetostatic fields generated by the patterned film, exerting forces on micrometer-sized superparamagnetic beads floating above it. These cyclic field variations transport the beads along the film’s surface without changing its magnetic configuration. Applying a stronger field, we change the effective symmetry of the potential acting on the beads and thus alter the dependence of the beads travel direction on the orientation of the plane within which the external field switches. Such tunability enhances the versatility of lab-on-a-chip devices based on magnetic particle transport.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173312"},"PeriodicalIF":2.5,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144571823","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
Optimization approach for complete magnetic hyperthermia model considering open magnetic field device 考虑开磁场装置的全磁热疗模型优化方法
IF 2.5 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-07-02 DOI: 10.1016/j.jmmm.2025.173340
Yundong Tang , Rodolfo C.C. Flesch , Tao Jin
{"title":"Optimization approach for complete magnetic hyperthermia model considering open magnetic field device","authors":"Yundong Tang ,&nbsp;Rodolfo C.C. Flesch ,&nbsp;Tao Jin","doi":"10.1016/j.jmmm.2025.173340","DOIUrl":"10.1016/j.jmmm.2025.173340","url":null,"abstract":"<div><div>Magnetic hyperthermia damages malignant tissue by the temperature elevation to a specific value, which is one of most popular treatment methods due to its safety with respect to other traditional ways. Magnetic nanoparticles (MNPs) with nanoscale size release the heat for bio-tissue according to Rosensweig’ theory when subjected to an alternating magnetic field. Previous reports mainly focused on the magnetic field in a relatively enclosed space, which however generally has some limitation on the placement of larger volume target and can lead to the inhomogeneous distribution due to the increase of internal space. This study establishes an open magnetic field device for magnetic hyperthermia, which is evaluated by the treatment effect of a simple rat model. Further, this device is also optimized by considering the radius of planar coil and by introducing a PID controller with adjusted parameters. After using finite element method for corresponding partial differential equations, the magnetic field profile for the proposed planar coil obtained is sequentially coupled with the temperature field distribution of biological tissue. The results demonstrate that the planar coil with more rings can result in a better scenario for magnetic hyperthermia with respect to less rings case to some extent. In addition, the proposed PID controller can be used to improve the thermal damage of malignant tissue by decreasing both the setting time and the overshoot for spatiotemporal temperature during therapy.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173340"},"PeriodicalIF":2.5,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144563713","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
Room temperature ferromagnetism in ceria nanorods and nanosheets: Influence of morphology and defects 室温下二氧化铈纳米棒和纳米片的铁磁性:形貌和缺陷的影响
IF 2.5 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-29 DOI: 10.1016/j.jmmm.2025.173337
Aila O. Santos , Noemi R. Checca , André V.H. Soares , Júlio César M. Silva , Odivaldo C. Alves
{"title":"Room temperature ferromagnetism in ceria nanorods and nanosheets: Influence of morphology and defects","authors":"Aila O. Santos ,&nbsp;Noemi R. Checca ,&nbsp;André V.H. Soares ,&nbsp;Júlio César M. Silva ,&nbsp;Odivaldo C. Alves","doi":"10.1016/j.jmmm.2025.173337","DOIUrl":"10.1016/j.jmmm.2025.173337","url":null,"abstract":"<div><div>This study investigates the structural, chemical, and magnetic properties of cerium oxide (CeO<sub>2</sub>) nanoparticles (NPs) with distinct morphologies, including nanorods (CeO<sub>2</sub> NR), nanosheets (CeO<sub>2</sub> NS), and polyhedral structures (CeO<sub>2</sub> poly). X-Ray Diffraction (XRD) analysis revealed significant variations in lattice microstrain and dislocation density, with CeO<sub>2</sub> NR exhibiting the highest values, followed by CeO<sub>2</sub> NS and CeO<sub>2</sub> poly. Transmission Electron Microscopy (TEM) micrographs confirmed the well-defined morphologies of the NPs, with CeO<sub>2</sub> NR showing an average width of 6 nm and length of 39 nm, while CeO<sub>2</sub> NS and CeO<sub>2</sub> poly presented average diameters of 14 nm and 27 nm, respectively. X-Ray Photoelectron Spectroscopy (XPS) analysis indicated that CeO<sub>2</sub> NR had the highest concentration of Ce<sup>3+</sup> ions and oxygen vacancies, which correlated with its enhanced magnetic susceptibility and polaron magnetization. In contrast, CeO<sub>2</sub> poly exhibited a more stable structure with lower defect density, resulting in weaker magnetic properties. CeO<sub>2</sub> NS presented intermediate characteristics, structural distortion and magnetic behavior. The formation of small polarons and bound magnetic polarons (BMPs) in CeO<sub>2</sub> NR, resulted by high tensile strain and oxygen vacancy concentration, was identified as a key factor in promoting room-temperature ferromagnetic (RTFM) ordering. These findings highlight the critical role of morphology in tailoring the properties of CeO<sub>2</sub> nanoparticles, offering valuable insights for the design of advanced functional materials for applications in spintronics, catalysis, and energy storage.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173337"},"PeriodicalIF":2.5,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144523301","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
Reductant assisted hydrothermally synthesized Ni-Fe based magnetic nanoalloys for tunable magnetization 还原剂辅助水热合成可调磁化镍铁基磁性纳米合金
IF 2.5 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-29 DOI: 10.1016/j.jmmm.2025.173335
Aiswarjya Bastia, Chandana Rath
{"title":"Reductant assisted hydrothermally synthesized Ni-Fe based magnetic nanoalloys for tunable magnetization","authors":"Aiswarjya Bastia,&nbsp;Chandana Rath","doi":"10.1016/j.jmmm.2025.173335","DOIUrl":"10.1016/j.jmmm.2025.173335","url":null,"abstract":"<div><div>A template-free, reductant-assisted hydrothermal method has been employed for the first-time to synthesize compositionally and magnetically tunable Ni<sub>1-</sub><em><sub>x</sub></em>Fe<em><sub>x</sub></em> (<em>x</em> = 0.25, 0.5, and 0.75) nanoalloys. The structural evidences from X-ray diffraction (XRD) patterns while confirm a single phase Face Centered Cubic (FCC) structure for <em>x</em>  = 0.25 and 0.5, coexistence of 90.53 % FCC and 9.47 % Body Centered Cubic (BCC) are identified for <em>x</em>  = 0.75. High-resolution scanning electron microscopy (HRSEM) demonstrates the particle size in the nano regime with reasonable chemical homogeneity of the alloys. From X-ray photoelectron spectroscopy (XPS), we observe the metallic Ni and Fe along with partial surface oxidation. Field dependent magnetization measurements reveal well saturated hysteresis with high saturation magnetization (M<sub>s</sub>) of 0.94, 1.59, and 0.86 μ<sub>B</sub>/f.u. for <em>x</em>  = 0.25, 0.5 and 0.75 respectively compared to bulk alloys. Such high M<sub>s</sub> is well explained by itinerant electron model showing a good agreement between experiment and theory. The composition dependent change in magnetization aligns with Slater-Pauling behavior and confirms the invar effect. Further, the fit of M<sub>s</sub> to Law of Approach to Saturation (LAS) estimates the effective anisotropy (<em>K<sub>eff</sub></em>) as 230, 760, and 430 kJ/m<sup>3</sup> for <em>x</em>  = 0.25, 0.5 and 0.75 respectively. The observed tunability of magnetization, along with low hysteresis loss, highlights the potential of these soft magnetic nanoalloys for applications in magnetic sensors and data storage technologies.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"630 ","pages":"Article 173335"},"PeriodicalIF":2.5,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144631998","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
Correlated electronic structures and magnetic properties of cerium monopnictides 铈单核苷酸的相关电子结构和磁性能
IF 2.5 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-28 DOI: 10.1016/j.jmmm.2025.173328
Chongxin Zhao, Min Liu
{"title":"Correlated electronic structures and magnetic properties of cerium monopnictides","authors":"Chongxin Zhao,&nbsp;Min Liu","doi":"10.1016/j.jmmm.2025.173328","DOIUrl":"10.1016/j.jmmm.2025.173328","url":null,"abstract":"<div><div>The electronic structures in cerium monopnictides CeX (X = N, P, As, Sb, Bi) have been systematically investigated using the DFT + DMFT method. We first investigate the geometric structures of the CeX. The results regarding the lattice parameter <em>a</em>, the bond length of Ce-X ions, the electronegativity of X ions, and the ion radius of X ions indicate that CeN is the most anomalous among them. This implies that the physical properties of CeN differ from those of other CeX (X = P, As, Sb, Bi) compounds. Based on this, we further investigate Ce-4<em>f</em> electrons’ behavior through the momentum-resolved spectral functions of CeX, the densities of states of Ce-4<em>f</em><sub>5/2</sub> and Ce-4<em>f</em><sub>7/2</sub> orbitals, and the Fermi surfaces. All these results present metal in CeX compounds. To study the correlation of the Ce-4<em>f</em> electrons, we also study the number of occupied electrons of Ce-4<em>f</em> (n<em><sub>f</sub></em>), the renormalization factor <em>Z</em>, and the Ce-4<em>f</em><sub>5/2</sub> peak height of CeX at the Fermi level. All these results suggest that CeN is in a mixed-valence state. Among these compounds, CeP exhibits a stronger correlation of Ce-4<em>f</em> electrons than others. In contrast, Ce-4<em>f</em> electrons in CeAs, CeSb, and CeBi are almost localized. These results imply that a 4<em>f</em>-electron itinerant-localized crossover can occur when changing the X atom from N to Bi. Finally, to understand the magnetic properties of CeX, we list six different magnetic structures: A1-AFM, G1-AFM, C1-AFM, A2-AFM, G2-AFM, and FM orders based on the DFT + <em>U</em> method. Our results show that CeP and CeAs have the A1-AFM order, while CeSb and CeBi have the A2-AFM order. These results are in good accordance with the experimental data.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173328"},"PeriodicalIF":2.5,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144517953","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
Comment on the paper “Thermal analysis of magnetohydrodynamics (MHD) Casson fluid with suspended iron (II, III) oxide-aluminum oxide-titanium dioxide ternary-hybrid nanostructures, Hajra Kaneez, Awab Baqar, Irum Andleeb, Muhammad Bilal Hafeez, Marek Krawczuk, Wasim Jamshed, Mohamed R. Eid, Assmaa Abd-Elmonem, Journal of Magnetism and Magnetic Materials 586 (2023), 171223” 论文“铁(II, III)氧化物-氧化铝-二氧化钛三元杂化纳米结构的磁流体动力学(MHD) Casson流体的热分析,Hajra Kaneez, Awab Baqar, Irum Andleeb, Muhammad Bilal Hafeez, Marek Krawczuk, Wasim Jamshed, Mohamed R. Eid, Assmaa Abd-Elmonem,磁学与磁性材料学报,586(2023),171223”
IF 2.5 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-28 DOI: 10.1016/j.jmmm.2025.173334
Asterios Pantokratoras
{"title":"Comment on the paper “Thermal analysis of magnetohydrodynamics (MHD) Casson fluid with suspended iron (II, III) oxide-aluminum oxide-titanium dioxide ternary-hybrid nanostructures, Hajra Kaneez, Awab Baqar, Irum Andleeb, Muhammad Bilal Hafeez, Marek Krawczuk, Wasim Jamshed, Mohamed R. Eid, Assmaa Abd-Elmonem, Journal of Magnetism and Magnetic Materials 586 (2023), 171223”","authors":"Asterios Pantokratoras","doi":"10.1016/j.jmmm.2025.173334","DOIUrl":"10.1016/j.jmmm.2025.173334","url":null,"abstract":"<div><div>A serious error exists in the above paper.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173334"},"PeriodicalIF":2.5,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514076","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
Spin disorder state in a site-depleted 3D coupled trillium spin-lattice system Pb1.5Fe2(PO4)3 缺位三维耦合万亿元自旋晶格体系Pb1.5Fe2(PO4)3的自旋无序态
IF 2.5 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-28 DOI: 10.1016/j.jmmm.2025.173302
K. Boya , V.K. Sahu , R. Kumar , P.L. Paulose , B. Koteswararao
{"title":"Spin disorder state in a site-depleted 3D coupled trillium spin-lattice system Pb1.5Fe2(PO4)3","authors":"K. Boya ,&nbsp;V.K. Sahu ,&nbsp;R. Kumar ,&nbsp;P.L. Paulose ,&nbsp;B. Koteswararao","doi":"10.1016/j.jmmm.2025.173302","DOIUrl":"10.1016/j.jmmm.2025.173302","url":null,"abstract":"<div><div>The study of spin liquids has emerged as a prominent subject of investigation in the field of magnetism owing to their notable characteristics encompassing long-range entanglement, fractional excitations, and topological order. The spin-liquid state is an exotic state of matter with no conventional magnetic long-range order and is rarely observed in <em>S</em> = <span><math><mfrac><mrow><mn>5</mn></mrow><mrow><mn>2</mn></mrow></mfrac></math></span> systems. Here, we have studied the magnetic behavior of Pb<sub>1.5</sub>Fe<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> (PbFPO) through magnetic and heat capacity measurements on polycrystalline samples. The PbFPO compound has two Pb sites with 25% site depletion in the lattice structure. The compound holds two trillium lattices of <em>S</em> = <span><math><mfrac><mrow><mn>5</mn></mrow><mrow><mn>2</mn></mrow></mfrac></math></span> moments in the unit cell, which are connected with additional magnetic couplings similar to that of KSrFe<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>. Despite the comparatively large Curie–Weiss temperature of -68 K (antiferromagnetic), the magnetic susceptibility data shows no sign of magnetic long-range order down to 2 K. The absence of field-dependent behavior in the heat capacity data up to 110 kOe field indicates that the PbFPO system possesses elevated spin correlations. The magnetic heat capacity data follows the power law behavior, probably stemming from the system’s gapless excitations from the spin-disordered state. Although the compound has a heavy site depletion, the spin disorder state is quite robust and is not even affected by the large magnetic fields.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173302"},"PeriodicalIF":2.5,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144549341","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
Modular winding for dual three-phase permanent magnet synchronous linear motor with low thrust ripple 低推力脉动双三相永磁同步直线电机的模块化绕组
IF 2.5 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-28 DOI: 10.1016/j.jmmm.2025.173332
Liyan Guo , Wenqian Yang , Huimin Wang , Tao Zhang
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