Journal of Magnetism and Magnetic Materials最新文献

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Experimental study on braking torque and energy efficiency ratio of composite disk-type magnetorheological brake 复合盘式磁流变制动器制动转矩及能效比试验研究
IF 2.5 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-06 DOI: 10.1016/j.jmmm.2025.173272
Wanhua Shi , Xiaolong Yang , Xinyue Zhu , Yurong Huang
{"title":"Experimental study on braking torque and energy efficiency ratio of composite disk-type magnetorheological brake","authors":"Wanhua Shi ,&nbsp;Xiaolong Yang ,&nbsp;Xinyue Zhu ,&nbsp;Yurong Huang","doi":"10.1016/j.jmmm.2025.173272","DOIUrl":"10.1016/j.jmmm.2025.173272","url":null,"abstract":"<div><div>In order to enhance the braking torque of the magnetorheological brake, a composite disk-type magnetorheological brake with a secondary coil is proposed and designed. In order to analyze the actual braking torque of the main coil and secondary coils in various operating modes and the corresponding energy efficiency ratio, the magnetic circuit design and mathematical model are completed first, followed by computational electromagnetics simulation and experimental validation. The experimental results demonstrate that with the main coils connected in series and energized alongside the secondary coils, the optimized configuration achieves a 3.3% increase in braking torque, albeit with an 8.5% reduction in energy efficiency ratio. The braking torque increases by 3.2% when operating the main coil in parallel configuration while co-activating the secondary coil, although this setup induces a 3.3% drop in the overall energy efficiency ratio.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173272"},"PeriodicalIF":2.5,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144263261","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
Enhanced spin-transfer torque in asymmetric superlattice magnetic tunnel junctions with engineered barrier profiles 非对称超晶格磁隧道结中增强的自旋传递转矩
IF 2.5 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-06 DOI: 10.1016/j.jmmm.2025.173276
Seyed Ali Hosseini Moradi , Nader Ghobadi , Sajad Esfandyari , Reza Daqiq
{"title":"Enhanced spin-transfer torque in asymmetric superlattice magnetic tunnel junctions with engineered barrier profiles","authors":"Seyed Ali Hosseini Moradi ,&nbsp;Nader Ghobadi ,&nbsp;Sajad Esfandyari ,&nbsp;Reza Daqiq","doi":"10.1016/j.jmmm.2025.173276","DOIUrl":"10.1016/j.jmmm.2025.173276","url":null,"abstract":"<div><div>We systematically investigate charge current dynamics and spin-transfer torque (STT) in asymmetric superlattice magnetic tunnel junctions (MTJs) featuring distinct ferromagnetic electrodes: CoFeB and La<sub>0.7</sub>Sr<sub>0.3</sub>MnO<sub>3</sub>. They incorporate both regular and engineered barrier-height profiles. The profiles include linear, Gaussian, Lorentzian, Pöschl-Teller, and anti-reflective designs. We use the non-equilibrium Green’s function formalism within the effective-mass tight-binding framework. STT is quantitatively evaluated under applied bias conditions. The study reveals that asymmetric MTJs exhibit marked enhancement in spin-transfer torque compared to symmetric counterparts. This improvement results from the interplay of asymmetric magnetization magnitudes and orientations. Custom barrier profiles optimize spin-polarized current transmission and angular momentum transfer. These findings deepen understanding of spin-dependent transport in complex MTJ architectures. These results highlight a promising pathway for advancing spintronic device performance, particularly in applications requiring efficient magnetization switching and low-power operation. The demonstrated approach offers a compelling strategy for designing next-generation spintronic components by leveraging structural asymmetry and barrier engineering to achieve superior STT efficiencies.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173276"},"PeriodicalIF":2.5,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144240162","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
Magnetocaloric and critical behavior studies in (Nd1-xYx)2CoMnO6 (x = 0.0 to 0.6) double perovskites (Nd1-xYx)2CoMnO6 (x = 0.0 ~ 0.6)双钙钛矿的磁热学和临界行为研究
IF 2.5 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-04 DOI: 10.1016/j.jmmm.2025.173266
Nibedita Nayak, S. Ravi
{"title":"Magnetocaloric and critical behavior studies in (Nd1-xYx)2CoMnO6 (x = 0.0 to 0.6) double perovskites","authors":"Nibedita Nayak,&nbsp;S. Ravi","doi":"10.1016/j.jmmm.2025.173266","DOIUrl":"10.1016/j.jmmm.2025.173266","url":null,"abstract":"<div><div>This study explores the double perovskite compounds (Nd<sub>1-</sub><em><sub>x</sub></em>Y<em><sub>x</sub></em>)<sub>2</sub>CoMnO<sub>6</sub> (<em>x</em> = 0.0–0.6), with a focus on their structural, and magnetic properties. The magnetocaloric effect and critical behavior are highlighted in the magnetic studies. The samples are synthesized using the gel combustion method and confirmed to crystallize in a monoclinic structure (P2<sub>1</sub>/n space group). With increasing Y concentration, a reduction is observed in the lattice parameters, unit cell volume, crystallite size, and grain size. The paramagnetic (PM) to ferromagnetic (FM) transition temperature (T<sub>C</sub>) is observed to be 176 K in the parent sample and 122 K in the <em>x</em>  = 0.6 sample. The long- range FM ordering is primarily driven by the super-exchange interaction between Co<sup>2+</sup> and Mn<sup>4+</sup> ions, mediated through oxygen. Raman studies performed at low temperatures (around T<sub>C</sub>) provide insights into the spin-phonon coupling. Magnetization curves with a maximum field of 9 kOe were measured for <em>x</em>  = 0.0 and 0.4 samples around their respective T<sub>C</sub> values to investigate the magnetocaloric effect. Arrott plots indicate that both samples exhibit second-order PM-FM phase transitions near T<sub>C</sub>. For the parent sample, the maximum magnetic entropy change (−Δ <span><math><msubsup><mi>S</mi><mrow><mi>M</mi></mrow><mrow><mi>max</mi></mrow></msubsup></math></span>) and the relative cooling power (RCP) were determined to be 4.75J/kgK and 177.2 J/kg, respectively at 9 T. Moreover, the critical behavior was analyzed using modified Arrott plots, and the critical exponents (β, γ, δ) were calculated. The validity of these determined critical exponents was confirmed through scaling hypothesis.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173266"},"PeriodicalIF":2.5,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144229841","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
Entanglement in (1/2, S) mixed-spin antiferromagnetic XY dimer and trimer systems (1/2, S)混合自旋反铁磁XY二聚体和三聚体体系的纠缠
IF 2.5 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-04 DOI: 10.1016/j.jmmm.2025.173208
Yue Li , Hui Jiang , Hui Yin , Xiangmu Kong
{"title":"Entanglement in (1/2, S) mixed-spin antiferromagnetic XY dimer and trimer systems","authors":"Yue Li ,&nbsp;Hui Jiang ,&nbsp;Hui Yin ,&nbsp;Xiangmu Kong","doi":"10.1016/j.jmmm.2025.173208","DOIUrl":"10.1016/j.jmmm.2025.173208","url":null,"abstract":"<div><div>In this manuscript, the entanglement in antiferromagnetic <span><math><mrow><mo>(</mo><mn>1</mn><mo>/</mo><mn>2</mn><mo>,</mo><mi>S</mi><mo>)</mo></mrow></math></span> mixed-spin XX and XY dimer and trimer systems are investigated by using the concept of negativity. For the <span><math><mrow><mo>(</mo><mn>1</mn><mo>/</mo><mn>2</mn><mo>,</mo><mi>S</mi><mo>)</mo></mrow></math></span> XX dimer models, when the external magnetic field and temperature are zero, the negativity values of the half-integer <span><math><mi>S</mi></math></span> systems are the same, and that of the integer <span><math><mi>S</mi></math></span> systems are the same. When the system is in the magnetic field, we obtain the threshold magnetic field above which the ground-state entanglement vanishes. For the (1/2,2) mixed-spin XY dimer system, when the temperature approaches zero, the values of thermal entanglement can correspond well to that of mixed-state one. For the (1/2,3/2) mixed-spin trimer system, the critical temperature is independent of the external magnetic field, but it is higher in the ferromagnetic case than in the antiferromagnetic case. In an extremely low temperature, entanglement forms a stable plateau within a certain magnetic field range, but when the magnetic field exceeds a critical value, it vanishes completely without the uniaxial single-ion anisotropy. Particularly, because the trimer system exhibits a certain frustration in the antiferromagnetic case, whether there is a magnetic field or not, entanglement between spins 1/2 is almost zero at any temperature.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173208"},"PeriodicalIF":2.5,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144313491","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 investigations on chemical-assisted magnetorheological shear thickening polishing for zirconia ceramics tubes 氧化锆陶瓷管化学辅助磁流变剪切增厚抛光实验研究
IF 2.5 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-04 DOI: 10.1016/j.jmmm.2025.173264
Xiang Zhang, Zenghua Fan, Zihao Yang, Jun Gao, Yebing Tian
{"title":"Experimental investigations on chemical-assisted magnetorheological shear thickening polishing for zirconia ceramics tubes","authors":"Xiang Zhang,&nbsp;Zenghua Fan,&nbsp;Zihao Yang,&nbsp;Jun Gao,&nbsp;Yebing Tian","doi":"10.1016/j.jmmm.2025.173264","DOIUrl":"10.1016/j.jmmm.2025.173264","url":null,"abstract":"<div><div>Zirconia ceramics tubes are widely employed in the fields of medical, aerospace, and energy due to high hardness and strength. A novel chemical-assisted magnetorheological shear thickening polishing (CMSTP) method is proposed in this study, achieving the objectives of improving the inner surface quality of zirconia ceramics tubes and enhancing polishing efficiency. The magnetic field generator was established by using four cylindrical N54 NdFeB radial magnetic poles. The magnetic flux density distribution within the polishing region was investigated by applying the magnetic field simulation analysis. The chemical-assisted magnetorheological shear thickening polishing slurry (CMSTPs) was developed for polishing experiments. Comparative experiments were conducted to assess the effectiveness of CMSTPs in polishing the inner surface of the zirconia ceramics tube. Compared to the magnetorheological shear thickening polishing slurry (MRSTPs), the polishing efficiency of the developed CMSTP method was increased by 24 %. The role of three critical processing parameters including carbonyl iron particles (CIPs) abrasive particle sizes, working gap, and workpiece rotational speed in determining surface morphology variations was rigorously examined through experimental characterization. Employing the CMSTP process under the processing parameters of a working gap of 0.5 mm, the workpiece rotational speed of 700 r/min, and the CIPs particle size of 100 μm, the surface after polishing exhibited a remarkable improvement from 1.209 μm to 102 nm. A smooth inner surface of the zirconia ceramics tube without convex peaks and deep scratches was observed by ultra-deep field microscopy, an optical profilometer, and scanning electron microscopy (SEM).</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173264"},"PeriodicalIF":2.5,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144229974","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
Corrosion resistance, mechanical and magnetic properties of cold-sprayed Al coating on the sintered NdFeB magnet after heat treatment 热处理后烧结钕铁硼磁体冷喷涂Al涂层的耐蚀性、力学性能和磁性能
IF 2.5 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-04 DOI: 10.1016/j.jmmm.2025.173265
Wenfu Chen, Linwei Zhang, Dan Wu, Chang Jiang, Siqi Zen, Xuebin Yang, Song Zen, Jiuming Yu
{"title":"Corrosion resistance, mechanical and magnetic properties of cold-sprayed Al coating on the sintered NdFeB magnet after heat treatment","authors":"Wenfu Chen,&nbsp;Linwei Zhang,&nbsp;Dan Wu,&nbsp;Chang Jiang,&nbsp;Siqi Zen,&nbsp;Xuebin Yang,&nbsp;Song Zen,&nbsp;Jiuming Yu","doi":"10.1016/j.jmmm.2025.173265","DOIUrl":"10.1016/j.jmmm.2025.173265","url":null,"abstract":"<div><div>A protective aluminum coating was deposited on the sintered NdFeB substrate by cold spray. A follow-up annealing at 450 °C, 500 °C and 550 °C was carried out to improve the properties of the coated magnet. Then, the effects of heat treatment temperature on the corrosion resistance, mechanical and magnetic properties of the cold-sprayed Al coatings on the sintered NdFeB magnet were studied. It was found that a higher value of corrosion potential and a lower value of corrosion current density for the heat-treated coating, exhibiting better corrosion resistance. And, the tendency of anti-corrosion improved with the temperature of heat treatment rise. The average bonding strength of the Al-coated NdFeB increased from 20.69 ± 1.71 MPa before treatment to 49.23 ± 2.21 MPa (treated at 450 °C), indicating that post heat treatment can significantly improve the bonding strength of the Al coating on the NdFeB substrate. The maximum magnetic energy product, and remanence decreased for the Al-coated NdFeB compared with the sintered NdFeB, with the different amplitude of 16.8 %, 2.3 %, 9.4 %, respectively. After heat treatment, the value of maximum magnetic energy product and remanence of the Al-coated NdFeB increased compared with untreated samples, and the value increased further as the temperature of heat treatment rise. But, the value of the intrinsic coercive field reduced after heat treatment, and the value fluctuated slightly as the temperature of heat treatment rise. The reasons for the abnormal results could be attribute to the NdFeB debris in the coating generated from the process of cold spray.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173265"},"PeriodicalIF":2.5,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144220856","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
Multifunctional properties of Cr-doped Sb2Te3: A comprehensive investigation into optoelectronic, magnetic, thermoelectric, and mechanical characteristics cr掺杂Sb2Te3的多功能特性:光电、磁、热电和机械特性的综合研究
IF 2.5 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-04 DOI: 10.1016/j.jmmm.2025.173258
Muhammad Usman Javed , Sikander Azam , Qaiser Rafiq , Imed Boukhris , Norah Salem Alsaiari
{"title":"Multifunctional properties of Cr-doped Sb2Te3: A comprehensive investigation into optoelectronic, magnetic, thermoelectric, and mechanical characteristics","authors":"Muhammad Usman Javed ,&nbsp;Sikander Azam ,&nbsp;Qaiser Rafiq ,&nbsp;Imed Boukhris ,&nbsp;Norah Salem Alsaiari","doi":"10.1016/j.jmmm.2025.173258","DOIUrl":"10.1016/j.jmmm.2025.173258","url":null,"abstract":"<div><div>The quest for multifunctional materials is vital for next-generation technologies in energy conversion, optoelectronics, and spintronics. Antimony telluride (Sb<sub>2</sub>Te<sub>3</sub>) stands out for its remarkable thermoelectric, optical, and topological properties but faces limitations like moderate thermoelectric efficiency and high thermal conductivity. This study investigates the impact of chromium (Cr) doping on Sb<sub>2</sub>Te<sub>3</sub>’s optoelectronic, magnetic, thermoelectric, and mechanical properties using DFT + U calculations. Cr incorporation significantly alters the electronic structure, inducing bandgap narrowing and pronounced spin splitting. The resulting spin-dependent band shifts enhance electrical conductivity while preserving a substantial Seebeck coefficient. DOS analyses reveal localized Cr-d states near the Fermi level, increasing carrier concentration and spin polarization. Magnetic analyses show that Cr’s large magnetic moment (3.77053 μB) drives ferromagnetic ordering, with a total moment of 4.00016 μB, highlighting potential for spintronic devices and quantum computing via the quantum anomalous Hall effect (QAHE). Thermoelectric evaluations demonstrate improved ZT values due to enhanced electrical conductivity and reduced lattice thermal conductivity from phonon scattering. The Seebeck coefficient remains favorable across temperatures, with spin-dependent variations suggesting applications in spin-caloritronics. Mechanical assessments reveal that Cr doping enhances Sb<sub>2</sub>Te<sub>3</sub>’s structural stability and mechanical robustness. Elastic constants (C<sub>11</sub>, C<sub>33</sub>) increase upon doping, reflecting improved resistance to uniaxial deformation. Enhanced shear constants (C<sub>44</sub>, C<sub>66</sub>) indicate better shear resistance, while bulk modulus (40.2 GPa), shear modulus (25.6 GPa), and Young’s modulus (64.8 GPa) confirm increased stiffness. The Poisson’s ratio (0.28) suggests that the doped material retains sufficient ductility for practical applications, and the improved Vickers hardness (2.9 GPa) signifies better wear resistance. These mechanical improvements ensure the material’s suitability for devices subjected to mechanical stress. Optically, Cr doping increases absorption in the visible and infrared regions, making the material suitable for solar cells, infrared detectors, and photonic devices. Modified dielectric and energy loss functions reflect improved light-matter interactions and reduced reflectivity. Overall, Cr-doped Sb<sub>2</sub>Te<sub>3</sub> exhibits a synergistic enhancement of its multifunctional properties, including electronic, magnetic, thermoelectric, mechanical, and optical characteristics. These comprehensive improvements position it as a strong candidate for spintronics, thermoelectric generators, and optoelectronic technologies, laying the groundwork for future experimental validation and device integration.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173258"},"PeriodicalIF":2.5,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144263262","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 pre-magnetized carbon fiber reinforced magnetorheological elastomer 一种预磁化碳纤维增强磁流变弹性体
IF 2.5 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-03 DOI: 10.1016/j.jmmm.2025.173263
Xin Ma , Chunsheng Song , Youliang Jiang , Yang Jiang
{"title":"A pre-magnetized carbon fiber reinforced magnetorheological elastomer","authors":"Xin Ma ,&nbsp;Chunsheng Song ,&nbsp;Youliang Jiang ,&nbsp;Yang Jiang","doi":"10.1016/j.jmmm.2025.173263","DOIUrl":"10.1016/j.jmmm.2025.173263","url":null,"abstract":"<div><div>Ordinary magnetorheological elastomer (MRE) mostly uses soft foundation materials as the matrix, and the prepared MRE has poor stiffness, which cannot meet the use of heavy-duty occasions such as hydraulic pipelines in large marines. To this end, fiber reinforced MRE was fabricated by adding carbon fiber (CF) precursor into silicone rubber matrix to improve the rigid bearing capacity. The effects of CF content, pre magnetization current and working magnetic field intensity on the energy storage and energy dissipation characteristics of MRE in thxxe frequency range of 0.1 Hz–100 Hz and the shear strain range of 0.01 %–10 % were analyzed. Experimental results indicated that with the increase of CF content, the bearing capacity of fiber reinforced MRE increases, but its energy consumption capacity decreases. The application of a solidification magnetic field can enhance its load-bearing capacity, but it will reduce its vibration reduction performance and limit its application in engineering. This discovery provides a certain theoretical basis for the application of MRE in the field of vibration reduction of marine hydraulic oil pipelines.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173263"},"PeriodicalIF":2.5,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144270431","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
Proposal of hybrid-type simulation techniques for spherical magnetic nanoparticles with uniaxial anisotropy: A combination of Brownian dynamics and Monte Carlo methods achieving fast and scalable simulations 具有单轴各向异性的球形磁性纳米颗粒混合型模拟技术的提出:布朗动力学和蒙特卡罗方法的结合实现了快速和可扩展的模拟
IF 2.5 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-03 DOI: 10.1016/j.jmmm.2025.173259
Kazuya Okada , Akira Satoh
{"title":"Proposal of hybrid-type simulation techniques for spherical magnetic nanoparticles with uniaxial anisotropy: A combination of Brownian dynamics and Monte Carlo methods achieving fast and scalable simulations","authors":"Kazuya Okada ,&nbsp;Akira Satoh","doi":"10.1016/j.jmmm.2025.173259","DOIUrl":"10.1016/j.jmmm.2025.173259","url":null,"abstract":"<div><div>We developed a hybrid-type simulation method that combines the Brownian dynamics (BD) and Monte Carlo (MC) methods for spherical magnetic particles with uniaxial magnetic anisotropy. In this hybrid-type simulation method, the viscous translational and rotational motions of a magnetic particle are simulated using the BD method, where the direction of the magnetic moment of the particle is determined using the MC method instead of the stochastic Landau–Lifshitz–Gilbert (LLG) method. We addressed a single-particle system to investigate the orientational properties of both the particle and magnetic moment. In order to verify the validity of the hybrid-type method, the present results were compared with those obtained by solving a stochastic LLG equation. With respect to the magnetisation curve, the hybrid-type simulation method gives rise to a theoretical solution (Langevin function), just as in the stochastic LLG simulation method. The orientational characteristics of the particle and the magnetic moment, as a function of the value of the magnetic anisotropy and as a function of the magnetic field strength, agreed well between the two simulation methods. Even if the anisotropic factor is more dominant than the thermal motion, the magnetic particle behaves as a superparamagnetic particle in a sufficiently strong magnetic field. The developed hybrid-type simulation method provides significantly higher performance with respect to CPU time in comparison with the stochastic LLG method, which is the most appealing aspect of the present simulation method. This CPU time may be a definitive factor in determining the feasibility of a particle-based simulation method for a multi-particle system. We conclude that the present hybrid-type simulation method is remarkably effective and practical for simulations of a multi-particle system where the motion of both the particle and the magnetic moment are governing factors, for instance, in studies on magnetic hyperthermia.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173259"},"PeriodicalIF":2.5,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144203081","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 geometrical parameters of magnetic nanoparticles in a linear chain on the conditions for generation, structure, and properties of discrete breathers 线性链中磁性纳米颗粒的几何参数对离散呼吸体生成、结构和性质的影响
IF 2.5 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-02 DOI: 10.1016/j.jmmm.2025.173250
Dmitry A. Kuzmin , Igor V. Bychkov , Evgenii G. Ekomasov
{"title":"Influence of geometrical parameters of magnetic nanoparticles in a linear chain on the conditions for generation, structure, and properties of discrete breathers","authors":"Dmitry A. Kuzmin ,&nbsp;Igor V. Bychkov ,&nbsp;Evgenii G. Ekomasov","doi":"10.1016/j.jmmm.2025.173250","DOIUrl":"10.1016/j.jmmm.2025.173250","url":null,"abstract":"<div><div>The study investigates the magnetization dynamics in one-dimensional chains of elliptical magnetic nanoparticles interacting via dipole–dipole interactions. Numerical simulations of the Landau–Lifshitz (LL) equations demonstrate the possibility of localized nonlinear high–amplitude magnetization oscillations in such nanoparticle chains, which manifest as discrete breathers (or intrinsic localized modes). These solutions consist of a “core,” where the magnetization vectors precess around a hard axis, and “tails,” where they oscillate around the equilibrium state. Analytical estimations of the breather frequency agree well with the numerical simulation results. The influence of the nanoparticles’ geometrical parameters on discrete breathers in a linear chain is determined. Analysis of the frequency expression shows that breathers can exist only when one of the principal axes—specifically, the one oriented perpendicular to the chain direction—is significantly smaller than the other two; that is, when the particles are nearly disk–shaped.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173250"},"PeriodicalIF":2.5,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144220854","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
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