Journal of Magnetism and Magnetic Materials最新文献_第4页

Voltage-modulated magnetic properties and enhanced thermal endurance in Ta/Mo-based perpendicular magnetic tunnel junctions Ta/ mo基垂直磁性隧道结的调压磁性和增强热耐久性

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-13 DOI: 10.1016/j.jmmm.2025.173293

S. Wu, G.J. Lim, F.N. Tan, T.L. Jin, C.C.I. Ang, K.J. Cheng, W.S. Lew

{"title":"Voltage-modulated magnetic properties and enhanced thermal endurance in Ta/Mo-based perpendicular magnetic tunnel junctions","authors":"S. Wu, G.J. Lim, F.N. Tan, T.L. Jin, C.C.I. Ang, K.J. Cheng, W.S. Lew","doi":"10.1016/j.jmmm.2025.173293","DOIUrl":"10.1016/j.jmmm.2025.173293","url":null,"abstract":"<div><div>In this work, we experimentally demonstrate Ta/Mo-based perpendicular magnetic tunnel junctions (pMTJs) with a double CoFeB free layer, engineered to leverage the complementary properties of the strong spin–orbit coupling of Ta and the interfacial anisotropy enhancement of Mo. The Ta/Mo bilayer significantly improves interfacial stability, perpendicular magnetic anisotropy (PMA) and thermal endurance, allowing the device to sustain PMA up to 550 °C, surpassing the thermal limits of conventional Ta-based structures. Furthermore, the application of gate voltage enables efficient modulation of the anisotropy field and coercivity, leading to a 23% reduction in switching current, demonstrating the efficacy of voltage-controlled magnetic anisotropy (VCMA) in lowering the energy barrier for magnetization reversal. This synergistic combination of spin–orbit torque (SOT) and VCMA mechanisms highlights the potential of the optimized Ta/Mo system for energy-efficient, high-performance memory and logic applications with low power consumption under elevated thermal conditions.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173293"},"PeriodicalIF":2.5,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144313492","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

Next-generation laminated nanocrystalline magnetic cores for high-frequency power electronics: enhancing magnetic properties and thermal stability 用于高频电力电子的下一代层压纳米晶磁芯：增强磁性和热稳定性

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-13 DOI: 10.1016/j.jmmm.2025.173299

Kuang-Heng Wan , Hsing-I Hsiang

{"title":"Next-generation laminated nanocrystalline magnetic cores for high-frequency power electronics: enhancing magnetic properties and thermal stability","authors":"Kuang-Heng Wan , Hsing-I Hsiang","doi":"10.1016/j.jmmm.2025.173299","DOIUrl":"10.1016/j.jmmm.2025.173299","url":null,"abstract":"<div><div>This study presents the development of next-generation laminated nanocrystalline magnetic cores designed for high-frequency power electronics, with a focus on enhancing magnetic performance and thermal stability. Fe-based amorphous alloy ribbons were used as the base material and subjected to optimized annealing treatments to induce controlled nanocrystallization. To suppress interlayer eddy currents and improve mechanical integrity, a spin-coating method was employed to incorporate nickel-zinc ferrite (NZF) nanoparticles, which were surface-modified using titanate coupling agents to enhance dispersion and thermal resistance.</div><div>The results demonstrate that optimized thermal treatment significantly reduces coercivity and improves saturation magnetization by promoting the formation of fine α-Fe(Si) nanocrystals. The incorporation of NZF nanoparticles further enhances high-frequency performance by increasing interlaminar resistivity and improving magnetic flux continuity. The fabricated laminated cores exhibit reduced core loss, improved inductance stability under DC bias, and extended resonant frequency range, indicating strong potential for integration into high-frequency inductors, transformers, and wireless power transfer systems. These findings provide a scalable and effective materials strategy for realizing compact, thermally stable, and energy-efficient magnetic components in next-generation power electronics.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173299"},"PeriodicalIF":2.5,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144297154","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

Competing magnetic states in novel full Heusler alloys: A DFT investigation of spin dynamics in diverse crystal structures of Mn2PtZn 新型全Heusler合金中的竞争磁态：Mn2PtZn不同晶体结构自旋动力学的DFT研究

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-13 DOI: 10.1016/j.jmmm.2025.173300

Asma Douma Bouthiba , AzeEddine Adjadj

{"title":"Competing magnetic states in novel full Heusler alloys: A DFT investigation of spin dynamics in diverse crystal structures of Mn2PtZn","authors":"Asma Douma Bouthiba , AzeEddine Adjadj","doi":"10.1016/j.jmmm.2025.173300","DOIUrl":"10.1016/j.jmmm.2025.173300","url":null,"abstract":"<div><div>This study employs first-principles calculations to explore the structural stability of the cubic (Cu<sub>2</sub>MnAl, Hg<sub>2</sub>CuTi) and tetragonal phases of the Mn<sub>2</sub>PtZn full-Heusler alloy in both ferromagnetic (FM) and antiferromagnetic (AFM) spin configurations. We used the Perdew-Burke-Ernzerhof generalized gradient approximation GGA and GGA + U to calculate the exchange–correlation energy.Key properties analyzed include cohesive and formation energies, structural, elastic, mechanical, and magnetic properties, phonon dispersion, thermodynamic stability, electronic band structure, and density of states. Our results indicate that the FM phases possess total magnetic moments of 7.89μ<sub>B</sub> and 7.86μ<sub>B</sub> for the cubic Cu<sub>2</sub>MnAl and Hg<sub>2</sub>CuTi structures, respectively, while the tetragonal structures exhibit moments of 7.50μ<sub>B</sub> and 7.69μ<sub>B</sub>. In contrast, the AFM phases show a total magnetic moment of 0 μ<sub>B</sub>, with the tetragonal AFM phase being the most energetically favorable among those studied. We also assessed the elastic and mechanical properties, confirming that the alloy meets the Born criteria for mechanical stability, suggesting ductility and anisotropic behavior. Additionally, we investigated the dynamic properties and the projected partial density of states for the Mn<sub>2</sub>PtZn alloy in both cubic and tetragonal phases. Dynamic stability was observed in all FM and AFM phases, except for the FM and AFM Hg<sub>2</sub>CuTi phases. The spin-polarized electronic band structures and density of states for the AFM tetragonal phase, calculated using GGA and GGA + U, reveal metallic behavior for both majority and minority spin channels, with magnetization primarily arising from the 3d states of manganese atoms. These findings suggest that the Mn<sub>2</sub>PtZn alloy is a promising candidate for spintronics and data storage applications.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173300"},"PeriodicalIF":2.5,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144290652","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

Formation mechanism of ultra-fine nanocrystalline structure for Co66Fe3Cr3Si18B10 alloy ribbons with ultra-high permeability 超高磁导率Co66Fe3Cr3Si18B10合金带超细纳米晶结构的形成机理

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-12 DOI: 10.1016/j.jmmm.2025.173295

Tong Liu , Shuhan Lu , Minggang Wang , Hongli Wang , Zhankui Zhao

{"title":"Formation mechanism of ultra-fine nanocrystalline structure for Co66Fe3Cr3Si18B10 alloy ribbons with ultra-high permeability","authors":"Tong Liu , Shuhan Lu , Minggang Wang , Hongli Wang , Zhankui Zhao","doi":"10.1016/j.jmmm.2025.173295","DOIUrl":"10.1016/j.jmmm.2025.173295","url":null,"abstract":"<div><div>Nanocrystalline alloys have attracted tremendous attention due to their excellent soft magnetic properties, especially low coercivity and high permeability. However, the formation of fine nanocrystalline grains relies on rapid annealing, which makes the nanocrystalline alloys difficult to apply in industrial production. In this study, Co<sub>66</sub>Fe<sub>3</sub>Cr<sub>3</sub>Si<sub>18</sub>B<sub>10</sub> alloy ribbons with ultra-fine nanocrystalline structure were prepared through a novel preparation method via critical cooling rate melt-spinning and conventional annealing. The microstructure evolution of the ribbons was characterized by XRD, DSC, and TEM, and the formation mechanism of the ultra-fine nanocrystalline structure was discussed. It was found that fine and densely distributed medium-range order quenched-in clusters formed at the near-critical cooling rate, and clusters grew into nanocrystalline grains with a uniform size of 4.81 ± 1.05 nm after annealing for 60 min. The nanocrystallized alloy exhibits a low coercivity of 0.43 A/m and a high initial permeability of 12.44 × 10<sup>4</sup>.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173295"},"PeriodicalIF":2.5,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144306463","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 first-principles study of the structural, phase transition, magnetic, and electronic properties of new quaternary OsZrTiZ (Z = Si, Ge, Sn, Pb) alloys 新型四元OsZrTiZ （Z = Si, Ge, Sn, Pb）合金的结构、相变、磁性和电子性能的第一性原理研究

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-12 DOI: 10.1016/j.jmmm.2025.173260

Hao Wu, Xiao-Wei Sun, Ting Song, Shuang-Gang Xu, Wei-Wei Li

引用次数: 0

Two-dimensional ferromagnetic TiCTe3 monolayer as an intriguing platform for quantum anomalous Hall effect 二维铁磁TiCTe3单层作为量子反常霍尔效应的有趣平台

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-11 DOI: 10.1016/j.jmmm.2025.173287

Yaping Wang, Weixin Liu, Weixiao Ji, Miaojuan Ren, Shengshi Li

{"title":"Two-dimensional ferromagnetic TiCTe3 monolayer as an intriguing platform for quantum anomalous Hall effect","authors":"Yaping Wang, Weixin Liu, Weixiao Ji, Miaojuan Ren, Shengshi Li","doi":"10.1016/j.jmmm.2025.173287","DOIUrl":"10.1016/j.jmmm.2025.173287","url":null,"abstract":"<div><div>The pursuit of two-dimensional (2D) ferromagnetic (FM) materials that harbor the intrinsic quantum anomalous Hall (QAH) effect has long been an important objective, given its profound implications for exploring novel physical phenomena and advancing next-generation spintronic devices. Herein, based on first-principles calculations, we predict that the 2D FM TiCTe<sub>3</sub> monolayer is an intrinsic QAH insulator with excellent thermodynamic stability. The monolayer exhibits perpendicular magnetic anisotropy, accompanied by a magnetocrystalline anisotropy energy (MAE) of 139.00 μeV per Ti atom. In the absence of spin–orbit coupling (SOC), the monolayer demonstrates Dirac half-metallic behavior. When the SOC is included, a nontrivial band gap opening of 37.40 meV is achieved, resulting in the emergence of the QAH effect characterized by Chern number <em>C</em> = − 1 and fully spin-polarized edge states within the bulk band gap. Meanwhile, the MAE and nontrivial band gap of the TiCTe<sub>3</sub> monolayer can be effectively manipulated by biaxial strain. These findings provide a remarkable and promising platform that is expected to have broad applications in nanoelectronics and spintronics.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173287"},"PeriodicalIF":2.5,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144270433","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

Maghemite and hematite nanowires synthesized by nanocasting: precursor effects on structural and magnetic properties 纳米铸造制备磁铁矿和赤铁矿纳米线：前驱体对结构和磁性能的影响

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-10 DOI: 10.1016/j.jmmm.2025.173288

Natalia I. Cuello , Emiliano G. Fornasin , Marcos I. Oliva , Gerardo F. Goya , Gustavo Marchetti , Griselda A. Eimer , Verónica R. Elías

{"title":"Maghemite and hematite nanowires synthesized by nanocasting: precursor effects on structural and magnetic properties","authors":"Natalia I. Cuello , Emiliano G. Fornasin , Marcos I. Oliva , Gerardo F. Goya , Gustavo Marchetti , Griselda A. Eimer , Verónica R. Elías","doi":"10.1016/j.jmmm.2025.173288","DOIUrl":"10.1016/j.jmmm.2025.173288","url":null,"abstract":"<div><div>Mesoporous iron oxides with tailored structural and magnetic properties were synthesized using the SBA-15 silica template and two different iron precursors: Fe(NO<sub>3</sub>)<sub>3</sub>·9H<sub>2</sub>O and Fe(C<sub>5</sub>H<sub>7</sub>O<sub>2</sub>)<sub>3</sub>, denoted as FeM-1 and FeM-2, respectively. The synthesis involved a two-step impregnation-calcination process followed by silica removal. Comprehensive characterization was performed using techniques such as nitrogen adsorption–desorption isotherms, TEM, SEM-EDX, XRD, XPS, and Mössbauer spectroscopy, as well as magnetic measurements.</div><div>The results revealed significant differences in structural and magnetic properties between the two samples. FeM-1 exhibited higher structural order, greater homogeneity, and a single-phase α-Fe<sub>2</sub>O<sub>3</sub> composition, whereas FeM-2 showed a bimodal pore size distribution and a dual-phase composition of α-Fe<sub>2</sub>O<sub>3</sub> and ɣ-Fe<sub>2</sub>O<sub>3</sub>. Magnetic characterization indicated enhanced magnetization in FeM-2 due to the ferrimagnetic nature of ɣ-Fe<sub>2</sub>O<sub>3</sub>, while FeM-1 displayed lower magnetization consistent with the weak ferromagnetic behavior of α-Fe<sub>2</sub>O<sub>3</sub>. The combination of structural and magnetic analyses demonstrated the critical role of precursor selection in tuning the material properties for potential applications in catalysis and magnetic devices.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173288"},"PeriodicalIF":2.5,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144313490","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

Large reversible magnetocaloric effect in GdPO4 nano-spherical particles at ultralow temperatures 超低温下GdPO4纳米球形颗粒的大可逆磁热效应

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-10 DOI: 10.1016/j.jmmm.2025.173291

Meryam Lassri , Said El Ouahbi , Imane Abdelrhafore , Lhaj El Hachemi Omari , Abdelhadi El Hachmi , Hassan Hamouda , Benaissa Harradi , Yousra Ounza , Gianluca Viscusi , Claire Minaud , Charafeddine Jama , Hassan Lassri

{"title":"Large reversible magnetocaloric effect in GdPO4 nano-spherical particles at ultralow temperatures","authors":"Meryam Lassri , Said El Ouahbi , Imane Abdelrhafore , Lhaj El Hachemi Omari , Abdelhadi El Hachmi , Hassan Hamouda , Benaissa Harradi , Yousra Ounza , Gianluca Viscusi , Claire Minaud , Charafeddine Jama , Hassan Lassri","doi":"10.1016/j.jmmm.2025.173291","DOIUrl":"10.1016/j.jmmm.2025.173291","url":null,"abstract":"<div><div>This study reports the synthesis of gadolinium phosphate (GdPO<sub>4</sub>) with a monoclinic crystal structure (<em>P2<sub>1</sub></em>/<em>n</em>) using a high-temperature solid-state reaction method. Rietveld refinement of the X-ray diffraction (XRD) data revealed lattice constants of <em>a</em> = 0.66497(5) nm, <em>b</em> = 0.68457(5) nm, and <em>c</em> = 0.63327(4) nm. The magnetic and magnetocaloric properties of GdPO<sub>4</sub> were investigated in detail. The ferromagnetic (FM) to paramagnetic (PM) phase transition temperature was determined to be around 1.8 K. The transition was strongly supported by Arrott plots and a universal phenomenological curve describing the magnetocaloric effect (MCE). GdPO<sub>4</sub> exhibits significant magnetic entropy changes (−ΔS<sub>M</sub>). The maximum values of <span><math><mrow><mo>-</mo><mi>Δ</mi><msubsup><mtext>S</mtext><mrow><mtext>M</mtext></mrow><mtext>max</mtext></msubsup></mrow></math></span> are 20.43 J/(kg·K) and 44.79 J/(kg·K) for a magnetic field change (μ<sub>0</sub>ΔH) of 2 T and 9 T, respectively. Our analysis indicates that the GdPO<sub>4</sub> nano-spherical particles exhibit short-range magnetic ordering, characterized by the coexistence of ferromagnetic (FM) and antiferromagnetic (AFM) interactions.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173291"},"PeriodicalIF":2.5,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144290651","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

Computational study of magnetic behaviour in Ni-adsorbed Nb2C-OF MXene using density functional theory 用密度泛函理论计算ni吸附Nb2C-OF MXene的磁性行为

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-09 DOI: 10.1016/j.jmmm.2025.173261

Zarah Khan , Saleem Ayaz Khan , Ayesha Zaheer , Syed Rizwan

{"title":"Computational study of magnetic behaviour in Ni-adsorbed Nb2C-OF MXene using density functional theory","authors":"Zarah Khan , Saleem Ayaz Khan , Ayesha Zaheer , Syed Rizwan","doi":"10.1016/j.jmmm.2025.173261","DOIUrl":"10.1016/j.jmmm.2025.173261","url":null,"abstract":"<div><div>Magnetic 2D materials have achieved significantly consideration owing to their encouraging applications. A variation of these 2D materials by occurrence of defects, by the transition-metal doping or adsorption or by the surface functionalization can initiate both the spin-polarization and magnetic properties in these materials. Density functional theory (DFT) is used to determine the electric, magnetic properties along with the electronic structures and stability of synthesized two-dimensional materials. This work describes the magnetic properties of Ni-ad-Nb<sub>2</sub>C-OF MXene. The study focuses on the computational approach based first principal calculation providing insight onto the magnetic properties of adsorbed compound and comparing it with pristine Nb<sub>2</sub>C-OF MXene. The pristine Nb<sub>2</sub>C-OF and Ni-ad-Nb<sub>2</sub>C-OF structures are simulated and optimized using Wien2k software. Using exchange-correlational functionals; spin-GGA and spin-GGA + U (for Nickel U = 6 eV), Ni-ad-Nb<sub>2</sub>C-OF electronic band structure is found to be metallic having magnetic moment calculated + 1.01516 <span><math><msub><mi>μ</mi><mi>β</mi></msub></math></span> showing its non-superconducting and ferromagnetic properties. Owing to this magnetic properties, this 2D compound holds potential for emerging applications in spintronics and nanoscale magnetic data storage technologies.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173261"},"PeriodicalIF":2.5,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144270430","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

Understanding dynamic frequency-matching resonance driven magnetic switching 了解动态频率匹配共振驱动磁开关

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-09 DOI: 10.1016/j.jmmm.2025.173281

Jian-Gang (Jimmy) Zhu

引用次数: 0