Journal of Magnetism and Magnetic Materials最新文献

{"title":"Magnetorheological brake with low off-state viscous torque and high on-state braking torque: Design and experimental validation","authors":"Rakesh Kumar Singh,&nbsp;Chiranjit Sarkar","doi":"10.1016/j.jmmm.2025.173171","DOIUrl":"10.1016/j.jmmm.2025.173171","url":null,"abstract":"<div><div>Magnetorheological (MR) brakes majorly face the problem of off-state viscous torque. Due to this torque, more power is consumed due to the rotation of the rotor during the non-braking operation period, and this period is generally more in any automobile or any machinery. Besides that, poor braking performance is another problem. Hence, in the present study, to improve the braking performance, an MR drum brake has been designed which can operate in shear mode and shear plus compression mode. To minimize the off-state viscous torque, some small permanent magnets have been placed in the brake shoes of the present MR brake. The magnetic field and particle tracing simulations have been performed. Again, the proposed MR drum brake has been tested on two–three wheelers brake inertia dynamometer, and its braking performance has been studied in the present study. The use of magnets not only reduces the off-state viscous torque but also helps in enhancing the braking performance of MR brake.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"628 ","pages":"Article 173171"},"PeriodicalIF":2.5,"publicationDate":"2025-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144115658","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}

{"title":"Effect of boron content on magnetic properties and microstructure of Dy-diffused sintered (Nd, Ce)-Fe-B magnets","authors":"Xiheng Shao ,&nbsp;Xiaoqing Zhou ,&nbsp;Shuhan Liang ,&nbsp;Chao Yang ,&nbsp;Yongsheng Que ,&nbsp;Bing Guo ,&nbsp;Huangping Bao ,&nbsp;Guocai Tang ,&nbsp;Xiangling Yan ,&nbsp;Jinsheng Bao ,&nbsp;Laishun Qin ,&nbsp;Kangying Shu ,&nbsp;Da Chen","doi":"10.1016/j.jmmm.2025.173165","DOIUrl":"10.1016/j.jmmm.2025.173165","url":null,"abstract":"<div><div>This study systematically investigates the effect of Boron (B) content on the magnetic properties and microstructure of Dy-diffused sintered (Nd, Ce)-Fe-B magnets, aiming to optimize the overall performance of low-cost Ce-containing magnets. Using conventional powder metallurgy, magnets with varying B contents (0.88–1.02 wt%) were fabricated, and DyH₃ was used as a diffusion source for grain boundary diffusion (GBD) treatment. The mechanisms by which B content influences magnetic performance, grain boundary phase distribution, and Dy diffusion efficiency were analyzed. The results show that increasing B content reduces the coercivity (<em>H</em>_cj) of the initial magnets from 13.88 kOe (0.90 wt% B) to 12.16 kOe (1.02 wt% B), while significantly improving remanence (<em>B</em>_r) and maximum energy product ((<em>BH</em>)_max). The magnets with low B content (0.90 wt% B) exhibit high <em>H</em>_cj due to the suppression of the magnetic coupling effect between the ferromagnetic initial grains by continuous grain boundary phases. After GBD treatment, the 0.95 wt% B magnets show the greatest increase in <em>H</em>_cj (6.04 kOe), while maintaining high <em>B</em>_r (12.85 kGs) and excellent temperature stability (<em>β</em>_20-120 = −0.553 %/°C). Microstructural analysis reveals that continuous grain boundary phases in the magnets with low B content provide efficient pathways for Dy diffusion, though excess CeFe₂ phases may hinder the diffusion process. In the magnets with high B content, fewer grain boundary phases force Dy to diffuse via less efficient lattice pathways, limiting the diffusion depth. The study confirms that 0.95 wt% B magnets, after Dy diffusion, exhibit the best overall performance, providing theoretical support for the development of low-cost, high-coercivity Ce-containing magnets.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"628 ","pages":"Article 173165"},"PeriodicalIF":2.5,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143937583","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}

{"title":"Characterization methodology of a magnetic heat exchanger for linear thermomagnetic motor","authors":"Guilherme Hitoshi Kaneko ,&nbsp;Alisson Cocci de Souza ,&nbsp;Tsuyoshi Kawanami","doi":"10.1016/j.jmmm.2025.173170","DOIUrl":"10.1016/j.jmmm.2025.173170","url":null,"abstract":"<div><div>Thermomagnetic motors (TMM) offer a promising solution for converting low-grade thermal waste into usable power by exploiting the phase transition of magnetic materials, particularly near their Curie temperature, under varying thermal and magnetic field conditions. Recent developments in magnetic materials with Curie temperatures near room temperature have opened new avenues for TMM applications. However, the performance characteristics of these materials are often underexplored. This study presents a comprehensive experimental methodology for evaluating the heat transfer, force generation, and operational dynamics of TMMs. Using gadolinium (Gd) as the test material, due to its well-established thermomagnetic properties, the study examines the force variation as a function of temperature and position within the motor, as well as the temperature evolution over time for different cycle periods. The effect of fluid flow configuration was also assessed, showing that counterflow increases the temperature difference (<em>ΔT</em>) by 50 to 400% compared to parallel flow, depending on the cycle period. Additionally, for the same <em>ΔT</em>, the counterflow configuration reduces the half-cycle duration by up to 45%, thereby increasing the motor’s potential power output. These findings provide valuable insights into the optimization of TMM operation, highlighting the importance of fluid flow direction in enhancing thermal performance and power efficiency. Future work will focus on implementing these findings into simulation models to further optimize TMM designs and explore the use of different magnetic materials for enhanced performance.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"628 ","pages":"Article 173170"},"PeriodicalIF":2.5,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143948883","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}

{"title":"Nonreciprocal interaction between Lamb waves, shear horizontal waves and spin waves at confined ferromagnetic heterojunction","authors":"J.Y. Lim ,&nbsp;C.K. Ong ,&nbsp;Yuping Yao ,&nbsp;Guozhi Chai","doi":"10.1016/j.jmmm.2025.173120","DOIUrl":"10.1016/j.jmmm.2025.173120","url":null,"abstract":"<div><div>We present a numerical study on the coupling between elastic Lamb waves, shear horizontal waves, and spin waves in a confined nanoscale ferromagnetic strip. Here, we report the nonreciprocal interactions between Lamb waves, shear horizontal waves, and spin waves. Our findings indicate that the elastic wave propagation has angular-dependent nonreciprocal characteristics, resulting from the magnetoelastic couplings. This work offers a further understanding of confined magnetoelastic waves for spintronic applications, providing an alternative approach to the realization of nonreciprocal hybrid magnonic devices.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"628 ","pages":"Article 173120"},"PeriodicalIF":2.5,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143937584","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}

{"title":"PID sliding mode control of floating stator permanent magnet synchronous linear motor with finite-time disturbance observer","authors":"Jiwen Fang ,&nbsp;Chao Chen ,&nbsp;Zhipeng Li ,&nbsp;Chong Li ,&nbsp;Mingming Lv","doi":"10.1016/j.jmmm.2025.173172","DOIUrl":"10.1016/j.jmmm.2025.173172","url":null,"abstract":"<div><div>In the process of high-speed and high-acceleration motion, linear motors not only have inertial vibration but also have a long vibration attenuation time. Aiming at the vibration problem caused by inertia, a floating stator linear motor with a vibration reduction module is proposed to suppress inertial vibration. The vibration energy is dissipated by the stator floating structure. Taking permanent magnet synchronous linear motor (PMSLM) as the research object, the nonlinear dynamic modeling of a floating stator linear motor is established based on the compression displacement between the rubber damping module and the floating stator as the segmentation criterion. The influence of stiffness, damping, preload displacement, and mass on the vibration of the linear motor base is studied by numerical simulation. The finite element simulation of the magnetic field and flux of the fixed and floating stator states is carried out with the help of Maxwell software. The adverse effects caused by the floating stator are equivalent to bounded disturbances, and a PID sliding mode controller with a finite-time disturbance observer is proposed. The experimental results show that the floating stator can weaken the influence of inertial vibration, and the floating stator linear motor can achieve a faster and more accurate response after applying the sliding mode control based on the disturbance observer.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"628 ","pages":"Article 173172"},"PeriodicalIF":2.5,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143941831","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}

{"title":"Magnetoelastic behavior of DP steel in biaxial mechanical loading condition — Equivalent stress for magnetostriction","authors":"Jeanne Le Soudeer,&nbsp;Olivier Hubert","doi":"10.1016/j.jmmm.2025.173058","DOIUrl":"10.1016/j.jmmm.2025.173058","url":null,"abstract":"<div><div>Online non-destructive magnetic monitoring is used to control the quality of steels subjected to multiaxial stresses. Due to magnetoelastic effects, a correction of non-destructive signal is necessary requiring the use of predictive magnetoelastic models on the one hand, and magnetoelastic measurements carried out under biaxial stress conditions on the other hand. Among magnetoelastic properties, magnetostriction under stress is particularly discriminent for models and the development of set-ups allowing for this measurement looks relevant. The first measurements of magnetostriction of a low carbon steel under biaxial stress have been reported in Hubert et al. (2023). This set-up shows several drawbacks among which a low magnitude and inhomogeneous magnetic field. In this study, an improvement of the previous biaxial set-up is first proposed. Anhysteretic and cyclic magnetic and magnetostrictive measurements of a dual-phase (DP) steel are reported next. An analytical approach of the magnetoelastic modeling is proposed on the other hand, leading to the proposition of new equivalent stress formulations applicable for magnetostriction.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"628 ","pages":"Article 173058"},"PeriodicalIF":2.5,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143941829","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}

{"title":"Three-dimensional numerical simulation of magnetic drug delivery in carotid artery with Eulerian-Lagrangian method: Injection point and magnetic field performance analysis","authors":"Ava Bina ,&nbsp;Majid Siavashi ,&nbsp;Borhan Beigzadeh","doi":"10.1016/j.jmmm.2025.173164","DOIUrl":"10.1016/j.jmmm.2025.173164","url":null,"abstract":"<div><div>The treatments used to treat cancer and cardiovascular diseases (as the leading causes of human morbidity) include surgery, radiotherapy, and chemotherapy. However, these treatments have various critical side effects. Researchers have focused on magnetic targeted drug delivery systems to minimize these side effects. Nanoparticles (Nps) are used as drug carriers to deliver drugs to the target in magnetic drug delivery. An applied magnetic field can control, guide or deviate particles toward the desired location or direction. This study aims to analyze the effects of injection point and magnetic field parameters on the drug delivery efficacy and Nps guidance to the desired branch of the carotid artery. The two-phase Eulerian-Lagrangian method is implemented to simulate non-Newtonian laminar blood flow in a real 3D carotid artery obtained from a computed tomography scan (CT-scan). Results are presented in terms of hemodynamics contours and parameters, including velocity, wall shear stress (WSS), vorticity, and oscillatory shear index (OSI). Results indicate that the orientation and intensity of the magnet have a considerable influence on Nps, which can lead most of the particles (95%) to the desired branch. Developing an efficient connection between the magnetic field and the release point will lead to greater drug delivery efficacy at the desired location and reduce the number of input particles to the unfavorable location. Choosing different Nps releasing points, magnet’s orientations, positions, and intensity play fundamental roles in guiding particles through the desired branch.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"628 ","pages":"Article 173164"},"PeriodicalIF":2.5,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143928542","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}

{"title":"Revealing effects of Co and Si co-doping on Ni-Mn-In Heusler alloy: Insights from first-principles calculations","authors":"Dan Liu ,&nbsp;Jianglong Gu ,&nbsp;Jinyu Zhang ,&nbsp;Jing Bai ,&nbsp;Keliang Guo ,&nbsp;Yu Zhang ,&nbsp;Qingshuang Ma ,&nbsp;Qiuzhi Gao ,&nbsp;Liang Zuo","doi":"10.1016/j.jmmm.2025.173166","DOIUrl":"10.1016/j.jmmm.2025.173166","url":null,"abstract":"<div><div>Magnetic cooling technology based on the magnetocaloric effect has attracted significant attention due to its high efficiency and environmental sustainability. In this work, a multi-element alloying strategy is proposed to meet the practical needs and provide theoretical support for the development of high-performance solid-state refrigeration materials. This study focuses on Ni-Mn-In-based Heusler alloy with large magnetocaloric effect, investigating the effects of Co and Si co-doping on martensite transformation as well as the magnetic and mechanical properties using first-principles calculations. The findings reveal that Si atoms preferentially occupy the sublattice of Mn, while Co and Si atoms exhibit a tendency for aggregated distribution within the Ni-Mn-In alloy. Si doping can significantly reduce the thermal hysteresis (Δ<em>T</em>_hys) of the alloy, while Co doping is helpful to improve the strength and magnetic properties. Overall, Co and Si co-doping can improve both the strength and toughness of the alloy. This work provides theoretical explanations for experimental phenomena and underlying mechanisms.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"628 ","pages":"Article 173166"},"PeriodicalIF":2.5,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143931868","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}

{"title":"Magnetoresistance and negative differential resistance effects in compound spintronic devices","authors":"Jing Zeng","doi":"10.1016/j.jmmm.2025.173173","DOIUrl":"10.1016/j.jmmm.2025.173173","url":null,"abstract":"<div><div>By applying the first-principles method, quantum spin-transport properties of compound spintronic devices constructed by the covalent coupling of the perylene molecule and two square-planar four-coordinate Co complexes (CoN₄s) with benzene or pyrazine groups are explored. The compound spintronic device assembled by the perylene molecule and two CoN₄s with pyrazine groups simultaneously exhibit magnetoresistance (MR) of 467 % and negative differential resistance (NDR). The mechanisms for the MR and NDR effects found in the compound spintronic device are suggested.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"628 ","pages":"Article 173173"},"PeriodicalIF":2.5,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143937582","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}

{"title":"Theoretical analysis of the anomalous table-like magnetocaloric effect in Er0.5Gd0.5Al2","authors":"P.J. von Ranke ,&nbsp;P.O. Ribeiro ,&nbsp;B.P. Alho ,&nbsp;R.S. de Oliveira ,&nbsp;A.M.G. Carvalho","doi":"10.1016/j.jmmm.2025.173111","DOIUrl":"10.1016/j.jmmm.2025.173111","url":null,"abstract":"<div><div>We investigated the recently reported anomalous entropic magnetocaloric effect in the ferromagnetic compound Er_0.5Gd_0.5Al₂ across a wide temperature range, exhibiting a table-like profile, from a theoretical perspective. Our model Hamiltonian incorporates crucial interactions: the crystalline electric field, intra- and inter-magnetic sublattice exchanges, and directional Zeeman effects. The simulated results successfully elucidate the origin of this anomalous effect, which arises from magnetic moment compensation between the Er and Gd sublattices. Additionally, we map the spin reorientation from the easy 〈1<!--> <!-->1<!--> <!-->1〉 to the 〈0<!--> <!-->0<!--> <!-->1〉 hard magnetization directions and predict an anomalous adiabatic magnetocaloric effect.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"628 ","pages":"Article 173111"},"PeriodicalIF":2.5,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143928523","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}