Journal of Superconductivity and Novel Magnetism最新文献

{"title":"Impact of Geometry on Magnetic Hysteresis: A Monte Carlo Study of Husimi Nanostructures","authors":"Z. Fadil,&nbsp;Chaitany Jayprakash Raorane,&nbsp;R. El Fdil,&nbsp;M. Naziruddin Khan,&nbsp;Seong-Cheol Kim,&nbsp;Abdulrahman A. Alsayyari,&nbsp;P. Rosaiah,&nbsp;E. Salmani","doi":"10.1007/s10948-026-07150-7","DOIUrl":"10.1007/s10948-026-07150-7","url":null,"abstract":"<div>\u0000 \u0000 <p>This study employs Monte Carlo simulations to investigate the influence of geometry, linear and biquadratic coupling interactions and temperature on the magnetic hysteresis properties of Husimi nanostructures. By analyzing triangular, square and pentagonal Husimi geometries, we demonstrate how these factors govern coercive fields, hysteresis loop behavior and thermal stability. The findings provide valuable insights into designing nanostructures tailored for technological applications, such as magnetic storage, memory devices, and spintronic sensors, emphasizing the role of geometry and coupling interactions in optimizing magnetic performance.</p>\u0000 </div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147341508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Giant magneto-impedance of Cu-doped Co-based glass-coated amorphous microwires","authors":"Shuangyou Li,&nbsp;Jiacheng Zhang,&nbsp;Chunbo Wang,&nbsp;Xiaojie Xue,&nbsp;Zhongyuan Yang,&nbsp;Shuotong Zong,&nbsp;Yan Zhang,&nbsp;Hongxia Liu,&nbsp;Zhigang Sun","doi":"10.1007/s10948-026-07149-0","DOIUrl":"10.1007/s10948-026-07149-0","url":null,"abstract":"<div>\u0000 \u0000 <p>In this study, high-quality glass-coated amorphous microwires (Co_0.7Fe_0.05Si_0.15B_0.1)_100−xCu_x (x = 0, 1, and 2) with few impurity phases, good continuity, and uniformity were successfully prepared using an optimized high-frequency induction melt-drawing technology. This work systematically investigated the effects of the direct current (DC) annealing process on the magnetic properties and giant magnetoimpedance (GMI) effect of these microwires. It was found that Cu doping enhances the crystallization stability of the alloy to a certain extent, and an appropriate content of the Cu element can significantly enhance the GMI effect of the microwires. The nanocrystallization mechanism discussed later is inferred based on relevant literature reports.What’s more, the DC annealing not only remarkably reduces the coercivity (<i>H</i>_c) of the microwires, but also significantly improves their saturation magnetization (<i>M</i>_s) and GMI effect. After DC annealing with 25 mA current, the <i>H</i>_c of (Co_0.7Fe_0.05Si_0.15B_0.1)₉₈Cu₂ microwires decreased from 3.2 A/m to 1.69 A/m, and the <i>M</i>_<i>s</i> increased from 50.49 emu/g to 73.03 emu/g. Meanwhile, by optimizing Cu content and DC annealing parameters, this work demonstrates a highly effective route to achieving a GMI ratio of 687% in Co-based microwires, offering a practical processing strategy for advanced GMI sensor materials.</p>\u0000 </div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147341509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"FL* Approach to Self-Energy in Cuprates: Marginal FL* Behaviour in Holes and Hourglass in the Spectral Weight of Magnons","authors":"P. A. Marchetti","doi":"10.1007/s10948-026-07142-7","DOIUrl":"10.1007/s10948-026-07142-7","url":null,"abstract":"<div><p>We apply to underdoped cuprates our FL* (fractionalized Fermi Liquid) formalism, where in addition to the standard holes other quasi-particle excitations are (semionic) holons that only carry charge and gapped spinons that only carry spin, interacting via a slave-particle gauge field. We first apply this approach to the “pseudogap phase” and we show that the slave-particle gauge interaction binds the holon and the spinon into a hole resonance whose spectral weight is essentially concentrated on Fermi arcs. Furthermore the self-energy of the hole exhibits what we call a Marginal FL* behaviour, i.e. the relaxation rate of the hole at zero temperature and small energy is proportional to the absolute value of the energy, measured from the Fermi surface. Along the nodal direction such behaviour combined with an additional Fermi liquid contribution is shown to be in agreement with many experimental data. We then apply the FL* formalism in the superconducting region of the doping-temperature phase diagram below the \"pseudogap phase\". There we show the appearance of a magnetic excitation, that we call magnon, as a spinon-antispinon resonance whose spectral weight exhibits a hourglass structure, qualitatively in agreement with neutron experiments. This structure appears as a consequence of a finite density of RVB spinon pairs and the slave-particle gauge attraction between unpaired spinons and antispinons.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10948-026-07142-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correction: Investigation of Gamma-Induced Changes To Screening Currents and AC Losses in Mono- Versus Multi-filamentary REBCO Coated Conductors Using DC and AC Magnetometry","authors":"Holly Jane Campbell,&nbsp;Hirokazu Sasaki,&nbsp;Yifei Zhang","doi":"10.1007/s10948-026-07135-6","DOIUrl":"10.1007/s10948-026-07135-6","url":null,"abstract":"","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10948-026-07135-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Complex Flux Flow of Vortex Lattice in Superconducting NbN Films","authors":"M. A. Vasyutin,&nbsp;N. D. Kuzmichev,&nbsp;D. A. Shilkin","doi":"10.1007/s10948-026-07137-4","DOIUrl":"10.1007/s10948-026-07137-4","url":null,"abstract":"<div>\u0000 \u0000 <p>The current-voltage characteristics (CVC) of superconducting niobium nitride (NbN) films are obtained at temperatures below the superconducting transition temperature (T_c) at T = 15.4 K in a constant magnetic field. For magnetic fields of up to µ₀H = 0.5 T, regions of linear CVCs with differential resistance independent of the magnetic field are observed. The resistive state of the films in this case is not described by the usual magnetic flux flow. The presence of such CVC regions is explained by an additional constant force (independent of magnetic field) acting on the vortex lattice. The origin of this force may be associated with collective pinning of the lattice on atomic-scale inhomogeneities, which are always present in niobium nitride. In addition, pinning can be associated with grain boundaries and strong intervortex interactions. In this case, the motion of a weakly pinned part of the vortex lattice in an environment of strongly pinned vortices near T_c in fields up to 0.5 T is possible.</p>\u0000 </div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comprehensive First-Principles Study of Structural, Thermoelectric, Magnetic, Optical, and Thermodynamic Properties of Antiperovskite CaCNi(_3) for Energy and Spintronic Applications","authors":"Murtaza Shahab,&nbsp;Muhammad Amir Khan,&nbsp;Zahid Ullah,&nbsp; Abdullah,&nbsp;Shah Khalid","doi":"10.1007/s10948-026-07140-9","DOIUrl":"10.1007/s10948-026-07140-9","url":null,"abstract":"<div><p>The structural, electronic, thermoelectric, magnetic, thermodynamic, elastic, and optical properties of the antiperovskite compound CaCNi<span>(_3)</span> are explored from first principles using DFT-based TB-mBJ and GGA<span>(+U)</span> methods. Structural optimisation validates system stability at a ground-state energy of <span>(-10552.36)</span> Ry and an equilibrium volume of around 378 a.u<span>(^3)</span>. The electron localisation function (ELF) shows significant covalent and ionic bonding, whereas electronic structure simulations show a metallic nature dominated by Ni-3<i>d</i> orbitals. The BoltzTraP evaluation of thermoelectric performance indicates moderate energy conversion potential, with a maximum figure of merit of <span>(ZT approx 0.26)</span> at 1000K at <span>(mu = +0.035)</span> eV. Pugh’s ratio = 2.23 confirms mechanical stability and ductility, while decreasing Gibbs free energy and increasing entropy up to 1200 K indicate thermodynamic stability. GGA<span>(+U)</span> magnetic analysis shows a limited net magnetic moment in CaCNi<span>(_3)</span>, which is confirmed by the spin-polarized density of states (DOS), which shows asymmetric spin channels and validates its ferromagnetic metallic nature. Optical examination confirms metallic behaviour with strong UV absorption (<span>(varepsilon _2)</span> peak <span>(sim 8)</span> eV), high reflectivity (<span>(sim 0.83)</span>), and a large static dielectric constant (<span>(varepsilon _1(0) = 35.50)</span>). CaCNi<span>(_3)</span> is a versatile material for high-temperature thermoelectrics, spintronics, and optoelectronics.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147339835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural and Electromagnetic Insights into Lanthanum-Substituted Strontium-Nickel (Sr–Ni) Hexaferrites for Enhanced X-Band Microwave Attenuation","authors":"Abdul Karim,&nbsp;Iftikhar Hussain Gul","doi":"10.1007/s10948-025-07128-x","DOIUrl":"10.1007/s10948-025-07128-x","url":null,"abstract":"<div><p>Lanthanum-modified strontium–nickel hexaferrite nanoparticles were produced using an auto-combustion sol–gel route to assess their potential as microwave absorbers. A set of compositions, Sr_0.50Ni_0.50La_xFe_12−xO₁₉ (x = 0.00, 0.25, 0.35, 0.50), was synthesized to study how gradually replacing Fe with La influences the structural, magnetic, dielectric, and electromagnetic attenuation behavior. The successful formation of the M-type hexaferrite phase is verified by XRD patterns, showing only slight lattice variations caused by Ni presence, and crystallite dimensions ranging from 29 to 48 nm. The FTIR spectra revealed characteristic metal–oxygen stretching vibrations corresponding to both tetrahedral and octahedral coordination sites, confirming the structural purity of the samples. Magnetic measurements obtained via VSM demonstrated that La substitution enhances the saturation magnetization, which increased from 50.66 to 59.29 emu/g. For x = 0.35, coercivity decreased significantly, dropping from 3956 Oe to 3110 Oe for x = 0.50 and further down to 2829 Oe, showing the evolution toward soft-magnetic behavior desirable for microwave-absorbing materials. The dielectric and magnetic responses, evaluated through the real and imaginary components of permittivity and permeability, showed that µ′ from 1.69 to 2.51 and ε′ increased from 4.23 to 8.64 at x = 0.35, revealing improved magnetic resonance effects and interfacial polarization. Among all prepared compositions, the x = 0.35 sample offered the most balanced electromagnetic properties, with ε′ = 11.84, ε″ = 5.16, µ′ = 2.73, and µ″ = 7.42 at 1 GHz, validating its superior microwave attenuation performance. Reflection loss measurements in the X-band (8–12 GHz) confirmed strong absorption for all samples, with the x = 0.35 composition showing the best result, a normalized impedance (Zin/Z0) close to 0.8, signalling excellent impedance matching at 9.45 GHz with minimum RL of − 39.26 dB. These findings establish La-doped Sr–Ni hexaferrite nanoparticles as lightweight, adjustable, and highly effective candidates for stealth and electromagnetic shielding applications.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147339947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DFT Investigation of the Pressure-Driven Insulator-Metal Transition in Iron-Based Ladder Compounds AFe2Q3 (A = Ca, Ba, Sr; Q = S, Se)","authors":"O. Khelladi,&nbsp;F. Drief,&nbsp;N. Benayad,&nbsp;M. Djermouni,&nbsp;S. Kacimi,&nbsp;A. Zaoui","doi":"10.1007/s10948-026-07133-8","DOIUrl":"10.1007/s10948-026-07133-8","url":null,"abstract":"<div>\u0000 \u0000 <p>The effects of hydrostatic pressure on the antiferromagnetic orthorhombic phase in iron-based ladder compounds <i>A</i>Fe₂<i>Q</i>₃ (<i>A</i> = Ca, Ba, Sr; <i>Q</i> = S, Se) have been investigated using the density-functional theory beyond the generalized gradient approximation, where the strong induced correlations from iron ion <i>d</i>-orbitals were treated by the Hubbard potential. This study aims to predict new <i>Mott insulators</i> by examining several properties under pressure, such as crystal structure, antiferromagnetic phase, insulator-metal transition, local magnetic moment, strong electronic correlation and density of states behavior. By carefully analyzing these properties and comparing them with existing experimental and theoretical data, we can assess the potential classification of these systems as <i>Mott materials</i>. Indeed, GGA + <i>U</i> calculations confirm the presence of an insulator-metal transition under pressure in all studied <i>123</i>-materials. Local magnetic moments decrease with pressure, indicating the weakening of correlation effects in metallic systems. A zero local magnetic moment indicates the presence of a non-magnetic or probably superconducting phase. Thus, the physical and electronic similarities between Mott insulators and our four hypothetical materials suggest they are potential candidates exhibiting Mott-like character.</p>\u0000 </div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147339633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural and Magnetic Characteristics of CoFexNi2−xS4 (x ≤ 0.06) Nanothiospinels: DFT Calculations","authors":"S. Caliskan,&nbsp;M. A. Almessiere,&nbsp;A. Baykal,&nbsp;Y. Slimani,&nbsp;A. Mihmanlı,&nbsp;S. E. Shirsath,&nbsp;L. I. Al-Jumaiah","doi":"10.1007/s10948-026-07144-5","DOIUrl":"10.1007/s10948-026-07144-5","url":null,"abstract":"<div><p>Microspheres of CoFe_<i>x</i>Ni_2−<i>x</i>S₄ (<i>x</i> ≤ 0.06) nanothiospinels (NTSs) were successfully synthesized hydrothermally. The influence of Fe³⁺ ion substitution on the morphology, structure, and magnetic performance of the products is carefully investigated. Magnetic properties of CoFe_<i>x</i>Ni_2−<i>x</i>S₄ (x ≤ 0.06) NTSs are analyzed at 300 K (RT) and 10 K between ± 50 kOe. At both temperatures, ferromagnetic nature (and hysteresis loops) is not detected for samples with <i>x</i> &lt; 0.03. For the host sample (x = 0.00), while a diamagnetic behavior was observed at 300 K, paramagnetic behavior was exhibited at 10 K. Kinks, showing up in the hysteresis loops at 10 K, disappear at 300 K. The coercivity values of Fe-doped NTSs (0.03 ≤ x ≤ 0.06) at both at RT and 10 K demonstrate their magnetically hard nature. These results highlight that the Ni dopants can be harnessed to achieve desired magnetic properties of CoFe_<i>x</i>Ni_2−<i>x</i>S₄ NTSs. The obtained findings show the potential for tuning the magnetic properties of CoFe_<i>x</i>Ni_2−<i>x</i>S₄ nanothiospinels, making them promising candidates for use in spintronics, magnetic data storage, and sensors.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147339559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Effect of Rare Earth Doping on the structure, Magnetic Properties and Electromagnetic Wave Absorption Performance of Ni-Zn Ferrites","authors":"Qun Wang,&nbsp;Qianqian Zhao,&nbsp;Xiaoqiang Xiong,&nbsp;Xi Yang,&nbsp;Huayang Gong,&nbsp;Guoguo Tan,&nbsp;Xiaodong Jing","doi":"10.1007/s10948-026-07143-6","DOIUrl":"10.1007/s10948-026-07143-6","url":null,"abstract":"<div>\u0000 \u0000 <p>Ni_0.5Zn_0.5RE_0.05Fe_1.95O₄ (RE = La, Ce, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Y) powders were synthesized using the sol-gel self-combustion method, and the effects of RE³⁺ doping and sintering temperatures on their structure, magnetic properties and electromagnetic wave absorption performance were studied. X-ray diffraction (XRD) studies indicate lattice distortion in Ni-Zn ferrites results in an increase in lattice constants and a decrease in grain size, and the secondary phase REFeO₃ (CeO₂) is observed. This indicates that the solid solution limit of rare earth ions in nickel zinc ferrite is relatively small, and the formation of the second phase may lead to iron deficiency in the primary phase. Scanning electron microscopy (SEM) results demonstrate that RE³⁺ion doping makes the grain distribution more uniform. Vibrating sample magnetometer (VSM) analysis reveals that doping with RE³⁺ ions decreases the saturation magnetization of Ni-Zn ferrites and the change in coercivity is related to the sintering temperature. Under sintering conditions of 900 °C, RE³⁺ion doping increases the coercivity of Ni-Zn ferrite, while under sintering conditions of 1250 °C, RE³⁺ion doping decreases the coercivity. Vector network analyzer (VNA) test results indicate that doping with RE³⁺ is difficult to increase the dielectric loss of NZFO in the gigahertz frequency band, but it can enhance the impedance matching effect. At lower sintering temperatures, rare earth doping is beneficial for nickel zinc ferrite to improve reflection loss and expand absorption bandwidth. while at higher sintering temperatures, due to significant grain growth, the influence of the second phase generated by rare earth doping on the main phase is significantly reduced. The minimum reflection loss of Ni_0.5Zn_0.5Dy_0.05Fe_1.95O₄ sintered at 900/3 is -22.38 dB, with a corresponding effective absorption bandwidth (EAB) of 3.39 GHz, and the EAB of Ni_0.5Zn_0.5Pr_0.05Fe_1.95O₄ in the C and Ku band is 4.23 GHz.</p>\u0000 </div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147339573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}