Journal of Magnetism and Magnetic Materials最新文献

{"title":"A sinusoidal magnetization distribution as an original way to generate a versatile magnonic crystal for magnon propagation","authors":"P. Micaletti ,&nbsp;A. Roxburgh ,&nbsp;E. Iacocca ,&nbsp;M. Marzolla ,&nbsp;F. Montoncello","doi":"10.1016/j.jmmm.2025.172959","DOIUrl":"10.1016/j.jmmm.2025.172959","url":null,"abstract":"<div><div>The manipulation of the magnetization in a film at the nanoscale is one of the best means for controlling spin-wave propagation in real time. In 3D Magnonics, the vertical or interfacial interaction with patterned layers can make the film magnetization depart from uniformity, which, in general, can introduce new spin-wave modes in the film, hence additional degrees of freedom for signal manipulation. In this paper, we suggest a sinusoidal distribution for the magnetization as an original and effective way to generate a magnonic crystal and control its magnon dynamics. Along with a uniform bias field, we introduce in the film layer a sinusoidal bias field, simulating the vertical/interfacial interaction with other layers: after relaxation, the film magnetization assumes a sinusoidal equilibrium distribution. Using micromagnetic simulations followed by Fourier analysis, we show how to control the magnon dynamics by tuning the magnetization undulation amplitude and symmetry. We compute the magnon dispersion curves and space profiles, we show the occurrence of new degrees of freedom for signal manipulation and the rise of localized and stationary magnon modes. We highlight the physical mechanisms governing the occurrence and variation of the frequency-gap at zone-boundary. Finally, we indicate how to practically implement a sinusoidal field (and consequent magnetization) when the vertical coupling is the inverse magnetoelastic interaction between ferroelectric and ferromagnetic films. Our results suggest a new mechanism for controlling magnon propagation, which appears extremely appealing for its really wide range of tunable effects on their dynamics, particularly interesting in the engineering of signal filtering, information storage and delivery, and sensing activity.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"622 ","pages":"Article 172959"},"PeriodicalIF":2.5,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143684887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Metamagnetic transitions in R2RhIn8 (R = Nd, Tb, Dy, Ho) compounds: A four-sublattice model approach","authors":"J.A. daSilva-Santos ,&nbsp;J.M. Santos ,&nbsp;E.J.R. Plaza ,&nbsp;V.S.R. de Sousa ,&nbsp;N.O. Moreno","doi":"10.1016/j.jmmm.2025.172995","DOIUrl":"10.1016/j.jmmm.2025.172995","url":null,"abstract":"<div><div>This work investigates the metamagnetic transitions observed in the R₂RhIn₈ (R = Nd, Tb, Dy, Ho) series of compounds. These compounds crystallize in the tetragonal Ho₂CoGa₈-type structure with the P4/mmm space group. To replicate the metamagnetic transitions a four-sublattice Hamiltonian model which incorporates the crystalline electric field (CEF) interaction and the exchange interaction within the molecular field approximation is employed. The CEF parameters for Tb₂RhIn₈, Dy₂RhIn₈, and Ho₂RhIn₈ were determined by fitting and simulating their isothermal magnetization curves. The Nd₂RhIn₈ CEF parameters were taken from the literature. The exchange interaction parameters were adjusted to optimize the agreement between the model and experimental data. This four sublattice model effectively reproduces the low-field metamagnetic transitions observed in the R₂RhIn₈ (R = Nd, Tb, Dy, Ho) series of compounds.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"622 ","pages":"Article 172995"},"PeriodicalIF":2.5,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143684888","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":"Zero-field square skyrmion crystal by spin–orbit and spin–charge couplings in noncentrosymmetric magnets","authors":"Satoru Hayami","doi":"10.1016/j.jmmm.2025.172961","DOIUrl":"10.1016/j.jmmm.2025.172961","url":null,"abstract":"<div><div>We investigate the possibility of a square skyrmion crystal at a zero magnetic field by focusing on the mutual interplay among the charge, spin, and orbital degrees of freedom in electrons. By taking into account the effect of the spin–orbital coupling as the Dzyaloshinskii–Moriya interaction and that of the spin–charge coupling as the biquadratic interaction in an effective spin model and performing the simulated annealing, we find that the square skyrmion crystal is robustly stabilized from zero to finite magnetic fields on a two-dimensional noncentrosymmetric square lattice. We also show that the zero-field square skyrmion crystal changes into a topologically trivial double-<span><math><mi>Q</mi></math></span> state by increasing the magnetic field. The present results provide another route to realize the zero-field square skyrmion crystal based on noncentrosymmetric itinerant magnets</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"622 ","pages":"Article 172961"},"PeriodicalIF":2.5,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143684883","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":"Magnetic structure and magnetodielectric behavior of the chiral magnet CoTeMoO6","authors":"Brady Wilson ,&nbsp;Ananta Raj Acharya ,&nbsp;Eun Sang Choi ,&nbsp;Ram Rai ,&nbsp;Qiang Zhang ,&nbsp;Stuart Calder ,&nbsp;Rafael Gonzalez-Hernandez ,&nbsp;Jonathan Guerrero Sanchez ,&nbsp;Chetan Dhital","doi":"10.1016/j.jmmm.2025.172963","DOIUrl":"10.1016/j.jmmm.2025.172963","url":null,"abstract":"<div><div>We investigate the magnetic structure and magnetodielectric behavior of the chiral magnet CoTeMoO<span><math><msub><mrow></mrow><mrow><mn>6</mn></mrow></msub></math></span> (CTMO) through neutron diffraction, magnetization, and magnetodielectric measurements, complemented by density functional theory (DFT) calculations. Our findings reveal a canted magnetic structure with moments confined to the <em>ab</em> plane, giving rise to weak ferromagnetism under an external magnetic field. Additionally, we observe magnetodielectric coupling that strongly correlates with the magnetic ordering temperature and magnetic structure. These results are discussed in the context of potential mechanisms involving spin-dependent <span><math><mi>p</mi></math></span>-<span><math><mi>d</mi></math></span> hybridization and spin-phonon coupling.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"622 ","pages":"Article 172963"},"PeriodicalIF":2.5,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143705456","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":"Magnetic field-assisted 3D printing of anisotropic magnetorheological elastomers: Performance enhancement and chain alignment mechanism in TPU-CIP composites","authors":"Zezhou Peng,&nbsp;Zirong Zhai,&nbsp;Rui Yang,&nbsp;Huiyu Xu,&nbsp;Yingna Wu","doi":"10.1016/j.jmmm.2025.172981","DOIUrl":"10.1016/j.jmmm.2025.172981","url":null,"abstract":"<div><div>This study investigates the potential of magnetic field-assisted 3D printing to enhance the comprehensive performance of magnetorheological elastomers (MREs) in additive manufacturing. Traditional MREs face limitations in structural complexity, while 3D-printed MREs (p-MREs) exhibit inferior balance between absolute and relative magnetorheological (MR) effects due to material constraints. To address this, we developed a method combining thermoplastic polyurethane (TPU) with carbonyl iron powder (CIP) and integrated an auxiliary magnetic field during fused deposition modeling (FDM). A custom-designed SmCo permanent magnet device generated a stable 500 mT field to induce anisotropy and suppress ring-shaped CIP structures. Microstructural analysis via scanning electron microscopy (SEM) and rheological testing revealed that magnetic field-assisted printing improved anisotropy and MR effects, achieving a relative MR effect of 440.6 % and absolute MR effect of 2.0 MPa under 1 T. Compared to isotropic p-MREs (relative MR: 387.2 %, absolute MR: 1.7 MPa), the comprehensive performance was enhanced by 13.8 %, though still lagging behind traditional anisotropic MREs. The study also identified a correlation between chain-like CIP alignment and reduced magnetic hysteresis, suggesting that soft magnetic MREs can mimic hard magnetic behaviors under field assistance. Unlike prior works using hard magnetic fillers, our TPU-CIP p-MREs achieved hard magnetic-like behavior (e.g., twisting) via field-assisted alignment, offering cost and environmental advantages. These findings advance the design of smart materials for applications requiring balanced stiffness and tunability, such as automotive dampers and soft robotics.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"622 ","pages":"Article 172981"},"PeriodicalIF":2.5,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143684828","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":"Highentropy soft magnetic alloy FexCo6Al3Ni2Si with high hardness and compressive strength","authors":"Artem Kim ,&nbsp;Alina Mazeeva ,&nbsp;Nikolay Razumov ,&nbsp;Ekaterina Volokitina ,&nbsp;Denis Nazarov ,&nbsp;Anatoliy Popovich","doi":"10.1016/j.jmmm.2025.172993","DOIUrl":"10.1016/j.jmmm.2025.172993","url":null,"abstract":"<div><div>In this work, the high-entropy alloy Fe_xCo₆Al₃Ni₂Si (where x = 5, 6, 8) was obtained by mechanical alloying. The microstructure, phase and granulometric compositions of the obtained powders were studied. The required specific energy dose for the formation of a homogeneous solid solution (D = 30 W⋅h/g) was determined. Using the CALPHAD method, a phase diagram was constructed for the multicomponent system Fe_xCo₆Al₃Ni₂Si. The Fe₈Co₆Al₃Ni₂Si alloy powder after mechanical alloying showed a saturation magnetization of 154 emu/g and a coercive force of 53 Oe.</div><div>Compact samples were obtained from Fe₈Co₆Al₃Ni₂Si alloy powder in a spark plasma sintering unit and annealed at temperatures of 900, 950 and 1000 °C. The microstructure and phase composition of the samples after annealing were studied. Tests of the magnetic properties of the samples showed that the saturation magnetization of the samples was from 159 to 168 emu/g, the coercive force was from 8.9 to 29.2 Oe. The compressive strength of the samples was from 2190 to 2680 MPa, and the microhardness was from 681 to 811 HV.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"622 ","pages":"Article 172993"},"PeriodicalIF":2.5,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143684885","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":"Enhanced magnetocaloric effect via Cu doping in Ni-Co-Mn-Sb-Cu Heusler alloys","authors":"Xiaoying Hou ,&nbsp;Mengyao Su ,&nbsp;Tongxin Yang ,&nbsp;Junmeng Zhang ,&nbsp;Guangyu Wen ,&nbsp;Dewei Zhao ,&nbsp;Congmian Zhen ,&nbsp;Li Ma ,&nbsp;Denglu Hou","doi":"10.1016/j.jmmm.2025.172964","DOIUrl":"10.1016/j.jmmm.2025.172964","url":null,"abstract":"<div><div>Room-temperature magnetic refrigeration is desirable owing to its high energy efficiency and low environmental effects. However, further research into exploring low-cost working materials with high magnetocaloric effects is required. In this study, Cu doping is employed in Ni-Co-Mn-Sb meta-magnetic shape memory alloys to tune the magnetostructural transformation parameters and enhance the magnetocaloric effect. Cu doping increases the transformation entropy change, effectively regulates the transformation width, and controls the magnetic field dependence of transformation temperature. Under the combined effect of a high transformation entropy change (35 J/kgK), an appropriate magnetic field dependence of transformation temperature (−1.4 K/T) and a narrow transformation width (13 K), Ni₄₁Co₉Mn₃₈Sb₁₁Cu₁ alloys exhibit a large isothermal entropy change of <strong>22.7</strong> J/kgK and a high simulated adiabatic temperature change of −4.1 K in a magnetic field of 5 T.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"622 ","pages":"Article 172964"},"PeriodicalIF":2.5,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143684882","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":"Investigation into the role of electrospinning nanofiber technology based on controlled magnetic-electric field","authors":"Jiabin Xu ,&nbsp;Chengshuai Sun ,&nbsp;Xiangyu Zhang ,&nbsp;Qiongyi He ,&nbsp;Yang Yu","doi":"10.1016/j.jmmm.2025.172991","DOIUrl":"10.1016/j.jmmm.2025.172991","url":null,"abstract":"<div><div>The diameter of nanofibers as smaller than that of the cells and thin film material field. In the field of medicine, nanofibers with simulate the structure and biological function of natural extracellular matrix, providing the possibility for human tissue and organ repair. With the new energy batteries, the preparation of battery separator materials as effectively reduce the nanofibers diameter and become an effective way to improve the filtration performance of nanofibers filters. By precisely regulating the micro-structure of the nanofibers and combining with the material via lower surface energy, the material with super hydrophobic properties as finally obtained. With MEMS, nanofibers have the higher specific surface area and microscopic porosity, which as increase the interaction area between the micro and nano sensing material and the flexible film material as-detected, and greatly improve the sensor performance. Based on the design parameters of the spinning orientation of alternating magnetic-electric field coupling technology, the characteristics of the coupling field were analyzed numerically. The drum collection device was designed for electrostatic spinning experimental machine to observe the orientation characteristics of spinning. The spinning orientation characteristics under different process parameters were studied by SEM characterization. The experimental results show that the spinning has better orientation in alternating magnetic-electric field coupling environment. The deposition area and region applying various magnetic field values as 1.4 (mT), 3.55 (mT), 4.6 (mT), 5.3 (mT), 8.5 (mT). The time-harmonic “magnetic-electric field” coupling electrostatic spinning machine described in this project adds the magnetic control module and the synchronous module to the controlled magnetic-electric field technology of electrostatic spinning, which retains with original technical advantages of electrostatic spinning and makes up for the disadvantages of randomness and poor stability of electrostatic spinning. Moreover, through the improvement of stability, the cost of raw materials and maintenance costs will be reduced in the further. Therefore, the new technologies and products adopted in this project have technical potential in both horizontal and vertical comparison.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"622 ","pages":"Article 172991"},"PeriodicalIF":2.5,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143684866","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":"Remanent magnetic response of hard magnetorheological elastomer foams: Fabrication, microstructure characterization and modeling","authors":"Zehui Lin,&nbsp;Zahra Hooshmand-Ahoor,&nbsp;Kostas Danas,&nbsp;Laurence Bodelot","doi":"10.1016/j.jmmm.2025.172954","DOIUrl":"10.1016/j.jmmm.2025.172954","url":null,"abstract":"<div><div>This work deals with the experimental, numerical and theoretical study of the purely magnetic response of hard magnetorheological elastomer (<span><math><mi>h</mi></math></span>-MRE) foams of variable particle and porosity content. First, the fabrication and experimental measurement of the remanent magnetic flux of the <span><math><mi>h</mi></math></span>-MRE foams are presented. We find that at lower particle content, the foam comprises closed-cell porosity, with the voids having a variable size and ellipsoidal shape. As the particle content in the matrix increases, the voids become smaller in size and more spherical in shape, while the porosity decreases. We show experimentally that the remanent magnetic flux is entirely independent of the shape and orientation of the voids. Image-based morphological analysis of the <span><math><mi>h</mi></math></span>-MRE foam microstructure subsequently allows to reconstruct numerically unit-cells that share the same statistics as those of the experimental foams. These unit-cells are used to construct an explicit theoretical model with magnetic dissipation. We show that the remanent magnetization is a linear function of the overall particle volume fraction in the foam. The model is further used to scale up the analysis and solve the experimental boundary value problem of a permanently magnetized <span><math><mi>h</mi></math></span>-MRE cube, and the numerical estimates show excellent agreement with the experiments. Finally, the numerical model is shown to match available analytical solutions for the remanent magnetic flux of parallelepiped magnets.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"622 ","pages":"Article 172954"},"PeriodicalIF":2.5,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143684861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tailoring the magnetic vortex annihilation field in shape asymmetric nanocaps","authors":"Anija Mary,&nbsp;Senoy Thomas","doi":"10.1016/j.jmmm.2025.172983","DOIUrl":"10.1016/j.jmmm.2025.172983","url":null,"abstract":"<div><div>We investigate the influence of geometrical asymmetry in manipulating the annihilation field of a magnetic vortex in nanocap structures. Geometrical asymmetry in the nanocap controls the annihilation sites and thereby, the annihilation field of the magnetic vortex. Appropriate field sequences via major or minor loops lead to distinct vortex circularities and annihilation fields. The origin of the distinct annihilation field is correlated with the difference in the field-dependent energy barrier for clockwise and counter clockwise vortex annihilation, which in turn arises from the asymmetry in geometry. Further, the study also investigated the impact of thickness of asymmetric nanocaps on the vortex annihilation fields. As the thickness of the hemishell increases, the difference between the energy barriers for vortex annihilation during the major and minor loops increases, leading to a greater difference between the annihilation fields along major and minor loops.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"622 ","pages":"Article 172983"},"PeriodicalIF":2.5,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143684863","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}