Journal of Magnetism and Magnetic Materials最新文献_第2页

Exchange interactions in Ba3Co2Fe24O41 ferrite

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-04-10 DOI: 10.1016/j.jmmm.2025.173046

Yanlin Ma , Yong yong Cao , Jie Li , Yida Lei , Yang Xiao , Yingli Liu , Zhiyong Zhong

引用次数: 0

Magnetization jumps in proximity of an itinerant ferromagnet

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-04-10 DOI: 10.1016/j.jmmm.2025.172994

Carmine Autieri

{"title":"Magnetization jumps in proximity of an itinerant ferromagnet","authors":"Carmine Autieri","doi":"10.1016/j.jmmm.2025.172994","DOIUrl":"10.1016/j.jmmm.2025.172994","url":null,"abstract":"<div><div>Placing our system in the proximity of the Stoner instability, the mean-field theory of itinerant metamagnetism and its implications are discussed in this study for several different cases. Two analytically solvable models, namely the M<span><math><msup><mrow></mrow><mrow><mn>6</mn></mrow></msup></math></span> Landau theory and the comprehensive analytical solution derived from the one-dimensional tight-binding density of state with the van Hove singularity (VHS), are presented. In our exploration, we calculate the analytical thermodynamic functionals, construct the phase diagrams, pinpoint the quantum critical endpoints, and delineate the critical magnetic fields. We examine the necessary and sufficient conditions for itinerant metamagnetism, scrutinizing the band structure effects and energy functionals. Finally, we extend the theoretical framework to the metamagnetic compound Sr<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>Ru<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>O<span><math><msub><mrow></mrow><mrow><mn>7</mn></mrow></msub></math></span> by using an ab initio tight-binding. Our analysis reveals that the VHS plays a pivotal role in inducing metamagnetism in layered ruthenates Sr<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>Ru<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>O<span><math><msub><mrow></mrow><mrow><mn>7</mn></mrow></msub></math></span>. Furthermore, we conduct a comparative analysis, discussing the distinctions between proximity to a ferromagnetic or an altermagnetic phase.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"624 ","pages":"Article 172994"},"PeriodicalIF":2.5,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817637","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

Probing Quantum Spin Liquids in the Kitaev model through spin current measurements

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-04-09 DOI: 10.1016/j.jmmm.2025.173024

L.V. Santos, A.R. Moura

引用次数: 0

Development of a magnetic field-triggered system with magnetic silica nanoparticles for enhanced controlled protein release

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-04-09 DOI: 10.1016/j.jmmm.2025.173059

Görkem Polat , İsmail Cengiz Koçum , Yeşim Sağ Açıkel

{"title":"Development of a magnetic field-triggered system with magnetic silica nanoparticles for enhanced controlled protein release","authors":"Görkem Polat , İsmail Cengiz Koçum , Yeşim Sağ Açıkel","doi":"10.1016/j.jmmm.2025.173059","DOIUrl":"10.1016/j.jmmm.2025.173059","url":null,"abstract":"<div><div>Advanced approaches such as biomimetic materials and stimulus-responsive systems that mimic complex biological processes in the body play an important role in the development of natural healing mechanisms. In this study, silica nanoparticles modified with magnetic nanoparticles triggered by magnetic field were synthesized by two methods as a multifunctional bone scaffold supplement. The nanoparticles were characterized by FIB-SEM, FT-IR, BET, DLS, VSM and zeta potential measurements. BSA model protein was loaded into magnetic silica nanoparticles and a loading capacity of 464.74 mg/g was obtained. Protein release studies were performed using an in-house Magnetic Field Triggered Release System (MFTRS), developed for greater control over magnetic nanoparticles. When the magnetic field was applied for 2 and 5 min, BSA release at 48 h was 58.95 ± 3.38 % and 74.03 ± 3.09 %, respectively. Without magnetic field, protein release was only 19.79 ± 3.90 % at 48 h. Furthermore, the release kinetics were analyzed using the Higuchi and Korsmeyer-Peppas models to understand the release mechanisms. The obtained results show that the magnetic field triggers protein release and the release rates increase as the field duration increases, emphasizing the potential of magnetic field-triggered nanoparticles in controlled protein delivery systems.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"624 ","pages":"Article 173059"},"PeriodicalIF":2.5,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143843358","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

Magnetic response of environmentally friendly prepared La3+ doped Li-Cu spinel ferrites

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-04-09 DOI: 10.1016/j.jmmm.2025.173056

A.U. Rahman , A. Alhadhrami , Mohamed M. Ibrahim , Gaber A.M. Mersal

{"title":"Magnetic response of environmentally friendly prepared La3+ doped Li-Cu spinel ferrites","authors":"A.U. Rahman , A. Alhadhrami , Mohamed M. Ibrahim , Gaber A.M. Mersal","doi":"10.1016/j.jmmm.2025.173056","DOIUrl":"10.1016/j.jmmm.2025.173056","url":null,"abstract":"<div><div>In this study, the Li<sub>0.1</sub>Cu<sub>0.5</sub>Fe<sub>2.3–y</sub>La<sub>y</sub>O<sub>4</sub> (y = 0.0, 0.1, 0.2, 0.3, 0.4) spinel ferrites (SFs) were synthesized <em>via</em> self-ignition route, and their structural, morphological, compositional and magnetic properties were systematically analyzed. X-ray diffraction (XRD) analysis revealed a slight shift in the (311) diffraction peak position with increasing La<sup>3+</sup> concentration, indicating lattice distortion. The crystallite size (D) decreased from 29.1 nm to 17.3 nm with doping, while lattice constant (a) and unit cell volume (V) exhibited a decreasing trend, confirming structural modifications due to La<sup>3+</sup> addition in Li-Cu spinel lattice. Moreover, the particle size was also decreased from 42 nm to 22 nm with the substitution of La<sup>3+</sup>. Magnetic response demonstrated a significant reduction in saturation magnetization (M<sub>S</sub>), from 60 emu/g to 23 emu/g, and coercivity (H<sub>C</sub>), from 1331 Oe to 639 Oe, suggesting weakened magnetic interactions. The squareness ratio (SQ) increased, while the magnetocrystalline anisotropy constant (K) decreased, indicating enhanced magnetic softness. Furthermore, the microwave operating frequency (ω<sub>m</sub>) was also reduced with La<sup>3+</sup> doping, highlighting changes in dynamic magnetic behavior. These findings suggest that La<sup>3+</sup> doping effectively tailors the structural and magnetic properties of Li-Cu SFs, making them potential candidates for tunable magnetic applications including recording media, memory devices, and transformer core applications.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"624 ","pages":"Article 173056"},"PeriodicalIF":2.5,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143824499","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

The structural, electronic, magnetic and optical properties of the binary Heusler alloy CaF3

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-04-08 DOI: 10.1016/j.jmmm.2025.173048

Ting Song, Shuai-Jun Liu, Shuang-Gang Xu, Hao Wu, Jun-Hong Tian, Xiao-Wei Sun

{"title":"The structural, electronic, magnetic and optical properties of the binary Heusler alloy CaF3","authors":"Ting Song, Shuai-Jun Liu, Shuang-Gang Xu, Hao Wu, Jun-Hong Tian, Xiao-Wei Sun","doi":"10.1016/j.jmmm.2025.173048","DOIUrl":"10.1016/j.jmmm.2025.173048","url":null,"abstract":"<div><div>The structural, electronic, magnetic and optical properties of the binary Heusler alloy CaF<sub>3</sub> have been investigated using a first-principles approach based on density functional theory. The predicted structure of CaF<sub>3</sub> and the structure of the Heusler alloy at pressures from 0 to 100 GPa are investigated, and it is found that the <span><math><mrow><mi>Pm</mi><mover><mrow><mn>3</mn></mrow><mrow><mo>¯</mo></mrow></mover><mi>n</mi></mrow></math></span> structure has the lowest energy and its most stable state is the ferromagnetic state in the whole range of pressures investigated, and verified to satisfy the stability thermodynamically, mechanically, and dynamical. Subsequently, the bandgap, the magnetic moment, and the spin polarisability of the <span><math><mrow><mi>Pm</mi><mover><mrow><mn>3</mn></mrow><mrow><mo>¯</mo></mrow></mover><mi>n</mi></mrow></math></span> structure near the Fermi energy level at 0 GPa, show semi-metallic properties and can be maintained up to 10 GPa. Finally, the reflectance, refractive index, and absorption coefficient are used to explain the optical properties of the <span><math><mrow><mi>Pm</mi><mover><mrow><mn>3</mn></mrow><mrow><mo>¯</mo></mrow></mover><mi>n</mi></mrow></math></span> structure, and it is found that the reflectance is almost close to 100% in the visible region, which implies that it can be used as a reflective material in the visible light range. The characterization study of binary Heusler alloy CaF<sub>3</sub> research study helps in the design and optimization of spintronic devices and optoelectronic devices.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"624 ","pages":"Article 173048"},"PeriodicalIF":2.5,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143825782","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

Crystalline electric field and anomalous Hall effect in topological semimetal PrGaSi

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-04-08 DOI: 10.1016/j.jmmm.2025.173022

Rajesh Swami , Daloo Ram , Z. Hossain

{"title":"Crystalline electric field and anomalous Hall effect in topological semimetal PrGaSi","authors":"Rajesh Swami , Daloo Ram , Z. Hossain","doi":"10.1016/j.jmmm.2025.173022","DOIUrl":"10.1016/j.jmmm.2025.173022","url":null,"abstract":"<div><div>We report the physical properties of PrGaSi single crystals through x-ray diffraction (XRD), magnetic, heat capacity, magnetoresistance, and Hall resistivity measurements. Powder XRD data reveal that PrGaSi crystallizes in LaPtSi-type tetragonal structure with space group <span><math><mrow><mi>I</mi><msub><mrow><mn>4</mn></mrow><mrow><mn>1</mn></mrow></msub></mrow></math></span><em>md</em>. Magnetic susceptibility measurements indicate a magnetic phase transition near 23 K, which is further corroborated by heat capacity and electrical resistivity data. Magnetization data also reveal pronounced magnetocrystalline anisotropy in PrGaSi, attributed to the influence of the crystalline electric field (CEF). Our CEF analysis indicates that the <span><math><mi>J</mi></math></span> = 4 multiplet of Pr<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span> splits into five singlets and two doublets with an overall splitting of <span><math><mo>∼</mo></math></span> 150 K. The electrical resistivity and heat capacity data in the ordered state show a gapped-magnon behavior with an energy gap of <span><math><mi>Δ</mi></math></span> <span><math><mo>∼</mo></math></span> 12.7 K. We observed an anomalous Hall effect (AHE) in Hall resistivity along <span><math><mi>B</mi></math></span> <span><math><mo>∥</mo></math></span> <span><math><mi>c</mi></math></span>. A large AHE in PrGaSi is explained through scaling analysis between the anomalous Hall resistivity and longitudinal resistivity suggesting dominance of skew scattering.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"624 ","pages":"Article 173022"},"PeriodicalIF":2.5,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143835375","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

Kinetic superexchange in a pair of pseudo-Jahn-Teller magnetic ions: Ferro- vs antiferromagnetic coupling

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-04-08 DOI: 10.1016/j.jmmm.2025.173044

Andrew Palii , Boris Tsukerblat

{"title":"Kinetic superexchange in a pair of pseudo-Jahn-Teller magnetic ions: Ferro- vs antiferromagnetic coupling","authors":"Andrew Palii , Boris Tsukerblat","doi":"10.1016/j.jmmm.2025.173044","DOIUrl":"10.1016/j.jmmm.2025.173044","url":null,"abstract":"<div><div>The main focus of this paper is to reveal the influence of the pseudo-Jahn-Teller effect (PJTE) on the exchange interaction in a pair of magnetic ions having a degenerate or pseudo-degenerate ground state. We consider the combined effect of the Anderson’s type kinetic exchange (that is called superexchange) between the two one-electron centers each having two nearly-degenerate low-lying magnetic orbitals mixed by the vibration of a suitable symmetry. The superexchange is assumed to be comparable with the energy gap between the two orbitals. Under such condition the electronic energy spectrum of the dimer is shown to consist of three superimposed pairs of <em>S</em> = 1 and <em>S</em> = 0 levels, with the order of the levels inside each group obeying Goodenough-Kanamori rules. The overall effect of superexchange is antiferromagnetic if the energy gap between the two orbitals is large as compared with the superexchange and it is ferromagnetic otherwise. The PJT effect proves to be spin-dependent that drastically modifies the energy pattern arising from the superexchange. The most spectacular effect of the vibronic coupling is the predicted possibility of changing spin of the dimer. In all cases strong PJT coupling stabilizes an antiferromagnetic ground state. We demonstrate that depending on the electronic parameters involved, one of the two types of minima proves to be the global one. One of these types describes ferrodistortive antiferromagnetic state, while for other one the system proves to be ferromagnetic and antiferrodistortive. In a broader context, these results show that a dimeric PJT cluster can serve as a molecular model for interconnected cooperative phenomena in PJT crystals such as magnetic, structural and orbital types of ordering.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"624 ","pages":"Article 173044"},"PeriodicalIF":2.5,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143825780","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

Modeling and experimental validation of transient surface roughness in magnetorheological finishing using 3-D magnetic flux density

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-04-07 DOI: 10.1016/j.jmmm.2025.173004

Moshahid Raza , Ritwik Mondal , Zafar Alam , Arun Dayal Udai

{"title":"Modeling and experimental validation of transient surface roughness in magnetorheological finishing using 3-D magnetic flux density","authors":"Moshahid Raza , Ritwik Mondal , Zafar Alam , Arun Dayal Udai","doi":"10.1016/j.jmmm.2025.173004","DOIUrl":"10.1016/j.jmmm.2025.173004","url":null,"abstract":"<div><div>Mathematical modeling of finishing processes is a way of getting a scientific framework for understanding and controlling the process parameters that influence the result. It enables better optimization and predictability of outcomes like surface roughness, improving quality and efficiency. This paper presents a mathematical model for transient surface roughness in the magnetorheological finishing (MRF) process. The MRF fluid is the main component of this process, containing ferromagnetic and abrasive particles. It forms a cross-linked chain-like structure in the influence of magnetism. These chains are assumed to be similar to the HCP crystal structure. Each HCP chain’s position is calculated with respect to the central axis of the cylindrical permanent magnet. 3-D magnetic flux density is considered to estimate the accurate variation of it across the axial and radial direction of the magnet within the working gap of the MRF tool tip and workpiece. The modeled total magnetic flux density (<span><math><msub><mrow><mi>B</mi></mrow><mrow><mi>T</mi></mrow></msub></math></span>) is validated and found to be 3.93% less and 4.07% more than the total magnetic flux density using the Tesla meter and simulation, respectively. The axial magnetic force is calculated based on the axial magnetic flux density that acts on the abrasive particles through ferromagnetic particles. Hardness for nano-indentation is modeled and utilized in the transient material removal rate (MRR) model. Further modeling of transient surface roughness is formulated based on the MRR model. The formulated theoretical model of MRR and surface roughness are in close agreement with the experimental values with R-squared of 0.991 and 0.953, respectively.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"624 ","pages":"Article 173004"},"PeriodicalIF":2.5,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143807182","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 comprehensive study of RE ions Ho doped Ni-Zn nanoferrites synthesized by sol–gel auto-combustion techniques

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-04-07 DOI: 10.1016/j.jmmm.2025.173042

N. Jahan , M.N.I. Khan , M.A. Ali , M.M. Hossain , M.S. Aktar , M.R. Hasan , Md. Akhtaruzzaman , M.M. Uddin

{"title":"A comprehensive study of RE ions Ho doped Ni-Zn nanoferrites synthesized by sol–gel auto-combustion techniques","authors":"N. Jahan , M.N.I. Khan , M.A. Ali , M.M. Hossain , M.S. Aktar , M.R. Hasan , Md. Akhtaruzzaman , M.M. Uddin","doi":"10.1016/j.jmmm.2025.173042","DOIUrl":"10.1016/j.jmmm.2025.173042","url":null,"abstract":"<div><div>High resistivity along with excellent magnetic properties are essential for the use of Ni-Zn nanoferrites in high-frequency applications. The addition of rare-earth (RE) ions Ho<sup>3+</sup> to Ni-Zn ferrites has resulted in structural distortion and changes in electrical and magnetic properties. In this regards, polycrystalline Ho-substituted Ni<sub>0.5</sub>Zn<sub>0.5</sub>Ho<em><sub>x</sub></em>Fe<sub>2-</sub><em><sub>x</sub></em>O<sub>4</sub> (0 ≤ <em>x</em> ≤ 0.20 in the step of 0.04) were synthesized by the sol–gel approach. The samples were examined using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and Fourier transform infrared spectroscopy (FTIR). The Physical Properties Measuring System (PPMS) was utilized to test magnetic properties. The samples’ purity and single-phase was verified by XRD, FESEM, and EDS. While the lattice constant, porosity, and specific surface area increased as the Ho<sup>3+</sup> ion concentration rose, the bulk density and particle size decreased. Both the average grain size (52–17 nm) and crystallite size decreases with increasing Ho<sup>3+</sup>. DC resistivity of ferrites made by the conventional method was at least four orders of magnitude higher, at order 10<sup>10</sup> Ω-cm. The extremely small grain size causing this discrepancy is properly described by the Maxwell-Wagner hopping conduction model. Applying the Cole-Cole plot, we have elucidated function of grain and grain boundary resistance. Ferrites may be used in high-frequency eddy current loss mitigation devices because of their high resistivity. The findings of this investigation point to the materials’ possible use in a high-frequency magnetic device.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"624 ","pages":"Article 173042"},"PeriodicalIF":2.5,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820276","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