Journal of Magnetism and Magnetic Materials最新文献

{"title":"Studies on structural, magnetic and corrosion properties of Novel Co35Cr5Fe10Ni30Ti5Al10-x Mn5+x (x = 0, 2.5, 5) high entropy alloys","authors":"Priyanka Kumari,&nbsp;Shashi Kant Mohapatra,&nbsp;Rohit R. Shahi","doi":"10.1016/j.jmmm.2025.173035","DOIUrl":"10.1016/j.jmmm.2025.173035","url":null,"abstract":"<div><div>We investigated the effect of the presence of both Mn and Al on magnetic and corrosion properties of Co₃₅Cr₅Fe₁₀Ni₃₀Ti₅Al_10-xMn_5+x (x = 0, 2.5, 5) High Entropy Alloys (HEAs). Three different HEAs were synthesized through the mechanical alloying technique and investigated for the phase formation, and its correlation with the magnetic properties. At the as synthesized stage a single fcc phase is formed due to the addition of 7th alloying element in Co₃₅Cr₅Fe₁₀Ni₃₀Ti₅Al_10-x Mn_5+x (x = 0, 2.5, 5) HEAs. However, after annealing at 700 ̊C for 2 h, a small amount of bcc and σ-phase are precipitated along with the fcc phase for the Co₃₅Cr₅Fe₁₀Ni₃₀Ti₅Al_10-xMn_5+x (x = 0, 2.5, 5) HEAs. The value of Ms and Hc are found 73 emu/g &amp; 18 Oe, 71 emu/g &amp; 15 Oe and 71 emu/g &amp; 17 Oe for the as- synthesized Co₃₅Cr₅Fe₁₀Ni₃₀Ti₅Al_10-x Mn_5+x HEAs (x = 0, 2.5, 5) respectively. However, after annealing of the as synthesized HEA at 700℃ 2 h, the value of Ms (102–106 emu/g), Hc (47–49 Oe) and Mr (2.26–2.48 emu/g) are increased significantly. The increment in the value of Ms for the annealed HEAs is associated with the decrease in the lattice parameter and dislocation density of the fcc phase as compared to the as- synthesized HEAs. We also investigated the corrosion resistance of annealed Co₃₅Cr₅Fe₁₀Ni₃₀Ti₅Al_10-x Mn_5+x (x = 0, 2.5, 5) HEAs and found good corrosion resistance for the developed HEA as compared to the recently reported HEAs and conventional soft magnetic materials.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"624 ","pages":"Article 173035"},"PeriodicalIF":2.5,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817634","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":"Nonzero RMS magnetoresistance yielding control space partition of CrTe2 monolayer","authors":"Chee Kian Yap ,&nbsp;Arun Kumar Singh","doi":"10.1016/j.jmmm.2025.173040","DOIUrl":"10.1016/j.jmmm.2025.173040","url":null,"abstract":"<div><div>The study of magnetic phenomena in low-dimensional systems has largely explored after the discovery of two-dimensional (2D) magnetic materials, such as CrI₃ and Cr₂Ge₂Te₆ in 2017. These materials presents intrinsic magnetic order, overcoming the limitations predicted by the Mermin-Wagner theorem, due to magnetic crystalline anisotropy energy. Among these, CrTe₂, a van der Waals 2D magnet, has gather significant interest due to its in-plane anisotropic magnetoresistance (AMR) and high Curie temperature. This study investigates the magnetic field-regulated resistance of CrTe₂ monolayers in the context of spintronics applications. Utilizing the zigzag-ordered parameters obtained from prior simulations, we examine how external magnetic fields influence resistance states and control the ON/OFF state of nano-devices. The analysis demonstrates that specific magnetic field configurations, particularly those in the form of (0, 0, Bz(ω)), which is out-of-plane directed field, gives a non-zero root mean square resistance, indicating a functional resistance ON state. This provides a novel method for magnetically controlled current regulation in spintronic devices. The experimental results also reveal an interesting spin-flop transition in CrTe₂ under a z-directed magnetic field, leading to y-directional magnetization. This phenomenon, combined with the material’s robust magnetic properties, positions CrTe₂ as a promising candidate for next-generation memory and logic devices. By advancing the understanding of magnetic field manipulation in 2D magnetic materials, this research opens new pathways in the development of energy-efficient spintronics technology.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"624 ","pages":"Article 173040"},"PeriodicalIF":2.5,"publicationDate":"2025-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143792503","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":"Modelling of ultra thin polarization insensitive dual band metamaterial absorber for shielding and sensing application","authors":"Sonu Jain,&nbsp;Mamta Devi Sharma,&nbsp;Ritu Sharma","doi":"10.1016/j.jmmm.2025.173041","DOIUrl":"10.1016/j.jmmm.2025.173041","url":null,"abstract":"<div><div>In this paper a dual band Metamaterial absorber developed for 5G (n78), WiMAX (Worldwide Interoperability for Microwave Access), and Wireless Local Area Networks (WLAN). The Fr4 substrate integrates two Metamaterial resonators. A crossed Z-shaped structure is specifically designed to absorb electromagnetic waves at a frequency of 3.5 GHz. In addition, a resonator in the shape of a square loop is responsible for absorbing waves in a second frequency band at 2.4 GHz. The top and bottom metallic layers are designed in such a way that radio frequency (RF) waves impinge on the dielectric surface. The resonance phenomena of the suggested structure were confirmed by employing an equivalent circuit model. Surface current analysis was also used to validate the metamaterial properties of the suggested structure. The suggested absorber’s absorption was confirmed under TE and TM polarization at various incidence angles. The investigations show that absorption is more than 99.99 % at 2.4 GHz and 3.5 GHz. Further metamaterial properties of the structure were investigated by finding negative refractive indexes at 2.4 GHz and 3.5 GHz. Moreover, analysis also confirmed the effectiveness of the designed absorber in a sensing application.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"624 ","pages":"Article 173041"},"PeriodicalIF":2.5,"publicationDate":"2025-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143825781","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":"Influence of Fe3+ and Co2+ co-doping on the electrical, magnetodielectric, and multiferroic properties of lead-free Ba0.7Sr0.3TiO3 ceramics","authors":"Arbaz Reyaz Khan,&nbsp;Sumit Bhardwaj,&nbsp;Sanjeev Kumar","doi":"10.1016/j.jmmm.2025.173030","DOIUrl":"10.1016/j.jmmm.2025.173030","url":null,"abstract":"<div><div>This study explores the ambient temperature multiferroic behavior in lead-free Ba_0.7Sr_0.3TiO₃ ceramics co-doped with transition metal ions (Fe³⁺ and Co²⁺) synthesized via the solid-state reaction (SSR) method. The research systematically investigates the effects of transition metal co-doping on the structural, ferroelectric, dielectric, magnetic, and magnetodielectric properties of the ceramics. X-ray diffraction (XRD) analyses confirmed the formation of a monophasic crystalline structure with <em>P4mm</em> space group symmetry across all compositions. Raman spectroscopy further supported the presence of single-phase crystallinity, consistent with the XRD results. Scanning electron microscopy (SEM) revealed a decrease in grain size due to the incorporation of transition metal ions. Dielectric properties, measured across a frequency range of 1 kHz to 1 MHz, demonstrated frequency-dependent behavior. Ferroelectric P–E hysteresis curves exhibited a consistent reduction in polarization (P_s and P_r), while magnetic M−H loops showed an enhancement in magnetic properties. Magnetodielectric (MD) analysis validated the coupling between ferromagnetic and ferroelectric ordering. The sample exhibited significant magnetodielectric effects, demonstrating a notable MC% value of 5.83 %. These findings highlight the potential of this co-doped BST ceramic for use in advanced non-volatile multiferroic memory devices.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"624 ","pages":"Article 173030"},"PeriodicalIF":2.5,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143792504","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 ferrimagnetic ground state of triangular-lattice system Ca3Co2O6","authors":"Santanu De ,&nbsp;Biswajit Dutta ,&nbsp;V.R. Reddy ,&nbsp;A. Banerjee","doi":"10.1016/j.jmmm.2025.173000","DOIUrl":"10.1016/j.jmmm.2025.173000","url":null,"abstract":"<div><div>High temperature one-dimensional (1D) ferromagnetic (FM) chains in Ca₃Co₂O₆ spin system are subjected to a magnetic field and temperature induced first order phase transition (FOPT) to 3D ferrimagnetic (FIM) ground state with decrease in temperature (T) at lower magnetic field. Weak-FM interaction of third-nearest-neighbor (nn) interchains removes the frustration effect arising from predominant antiferromagnetic (AFM) interactions of first-nn and second-nn interchains in the underlying triangular-lattice resulting a 3D FIM ordering of 1D FM chains at low T. However, hindered kinetics of FOPT partially masks this transformation giving rise to coexistence of non-interacting 1D FM chains with 3D FIM state at low T. The complex exchange pathways of the 3D FIM state is further substantiated by random substitution of S = 5/2 magnetic-impurity into the spin chains of original system. It reveals weakening of FM interactions of both intrachain and third-nn surrounding chains, respectively, without significant modulation in the AFM coupling of first-nn and second-nn interchains. Thus, the effect of AFM interactions is enhanced as compared to FM couplings with increase of S = 5/2 impurities resulting instability of 3D long-range FIM state at low T.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"624 ","pages":"Article 173000"},"PeriodicalIF":2.5,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817636","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":"The effect of non-uniform quenching on the surface domain structure of amorphous Fe-based microwires","authors":"O.I. Aksenov ,&nbsp;S.I. Bozhko ,&nbsp;A.A. Fuks ,&nbsp;A.S. Aronin","doi":"10.1016/j.jmmm.2025.173032","DOIUrl":"10.1016/j.jmmm.2025.173032","url":null,"abstract":"<div><div>The magnetic domain structure of amorphous Fe_77.5Si_7.5B₁₅ microwires was investigated by magnetic force microscopy. The diameter of the metallic part was 20 µm. It was found that the surface domain layer of uncoated microwires with positive magnetostriction could be divided into two regions: a region containing magnetic domains inclined to the axis or zigzag-shaped domains and a region containing ring domains with a radial orientation of the magnetic moment. It was assumed that that was due to stresses non-uniformly distributed across the cross-section and length of the microwire. The surface domain structure of the microwire was studied after removing the surface part with a thickness of 2 µm. The removal of the surface part resulted in the formation of a magnetic structure that did not have radial components of magnetic stray fields near the sample. When a magnetic field was applied (as in the case of the as-prepared microwires), a stable structure of ring domains with a width of 2.5–5 µm was formed.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"624 ","pages":"Article 173032"},"PeriodicalIF":2.5,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143800718","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":"Edge-potential induced skyrmion pinning and radial deformations under varying non-adiabatic spin torques","authors":"Dhananjay Nair,&nbsp;Shrawan K. Mishra","doi":"10.1016/j.jmmm.2025.173023","DOIUrl":"10.1016/j.jmmm.2025.173023","url":null,"abstract":"<div><div>Magnetic skyrmions are non-trivial topological spin textures that garnered intensive research attention due to their futuristic potential applications under their low-current-driven dynamics at the nano-length scale. Skyrmions-based racetrack memory devices where data can be embedded using skyrmions is a promising information storage technology. This makes the exploration of skyrmion transport properties on a racetrack under the influence of potential parameters is crucial for the designing of these next-generation energy-efficient memory devices. A systematic analysis of the influence of non-adiabatic spin torques and other key material parameters on skyrmion motion is presented using micromagnetic simulations. Skyrmions size-dependent dynamics in response to the edge potential under constant current density for Néel-type skyrmions are investigated. The theoretical frameworks indicate that smaller skyrmions drift off to a larger distance in the transverse direction owing to their smaller radius and smaller edge repulsion, eventually saturating with variation in their radius depending on the non-adiabatic torque coefficient. The smaller skyrmion shows undeformed stabilized states expelled at the edges with the increased difference in Gilbert damping (α) and non-adiabatic torque coefficient (β). The results also indicate a non-uniform distortion in the case of smaller skyrmions, deviating from their initial circular configuration to elliptical edge states while larger stabilized skyrmion states preserve their circular symmetry. We further discuss the influence of spin–orbit torques and interfacial spin-transfer torques on the skyrmion motion. These results provide a comprehensive understanding of the skyrmion pinning characteristics under the balancing act of Magnus force and skyrmion-edge repulsion.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"624 ","pages":"Article 173023"},"PeriodicalIF":2.5,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817638","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":"Temperature assisted curvature-manipulated spin-orbit torque induced switching of magnetization in Ta/Pt/Co/Pt ferromagnetic heterostructures fabricated on flexible PET substrates","authors":"Qi Guo,&nbsp;Xinyu Gao,&nbsp;Chaofan Li,&nbsp;Shuotong Zong,&nbsp;Jifan Hu,&nbsp;Zhicheng Wang,&nbsp;Yaxu Jin","doi":"10.1016/j.jmmm.2025.173025","DOIUrl":"10.1016/j.jmmm.2025.173025","url":null,"abstract":"<div><div>We study the curvature-manipulated spin–orbit torque (SOT)-induced switching of magnetization of Ta/Pt/Co/Pt heterostructures fabricated on flexible polyethylene terephthalate (PET) substrates under different temperature conditions. Because of the huge strain induced magnetic anisotropy and inferior perpendicular magnetic anisotropy (PMA) at 350 K, the strain generated from bending PET substrate can control SOT-induced switching of magnetization and PMA efficiently with the varying curvature. Curvature modulates the anomalous Hall resistance regularly and stably at different temperatures under alternating current pulses. Moreover, the magnetic optical Kerr effect (MOKE) measurements clearly demonstrate domain wall motion is driven by curvature under different temperatures. This study provides an efficient approach to fabricate wearable spintronic equipment and extends the potential applications of spintronic technology.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"624 ","pages":"Article 173025"},"PeriodicalIF":2.5,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143800719","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":"Magnetophoresis-Based particle separation in microfluidic channels using grooved current-carrying conductor: Design, simulation, and optimization","authors":"A. Nameni ,&nbsp;M.H. Kayhani ,&nbsp;V. Mashayekhi ,&nbsp;M. Nazari","doi":"10.1016/j.jmmm.2025.173026","DOIUrl":"10.1016/j.jmmm.2025.173026","url":null,"abstract":"<div><div>This study investigates the application of magnetophoresis for efficient particle separation within microfluidic channels. By modifying the structure of a current-carrying conductor, a controlled magnetic field gradient is generated. This gradient exerts precise forces on magnetic particles, influencing their trajectories in the laminar flow of the microchannel. The system design incorporates an asymmetric groove in the conductor to enhance the non-uniformity of the magnetic field, thereby optimizing particle manipulation. Finite element simulations are conducted to analyze and validate the performance of the system under varying parameters such as groove dimensions, electric current intensity, and fluid flow rates. Results demonstrate that optimal design parameters significantly improve separation efficiency, highlighting the potential of magnetophoresis for biomedical and industrial applications requiring precise particle handling in microfluidic environments.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"624 ","pages":"Article 173026"},"PeriodicalIF":2.5,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143807183","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":"Magnetocaloric effect for the topological semimetal Co3Sn2S2 due to the antiferromagnetic coupling of the bulk and surface spin-polarized phases","authors":"N.N. Orlova,&nbsp;V.D. Esin,&nbsp;A.V. Timonina,&nbsp;N.N. Kolesnikov,&nbsp;E.V. Deviatov","doi":"10.1016/j.jmmm.2025.172998","DOIUrl":"10.1016/j.jmmm.2025.172998","url":null,"abstract":"<div><div>We experimentally investigate magnetocaloric effect for the topological magnetic Weyl semimetal Co<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>Sn<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>S<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> in a wide temperature range. The isothermal magnetic entropy change <span><math><mi>Δ</mi></math></span>S is calculated from the experimental magnetization curves by using Maxwell relation. In addition to the expected <span><math><mi>Δ</mi></math></span>S peak at the Curie temperature <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>C</mi></mrow></msub></math></span>, we obtain another one at the temperature <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>i</mi><mi>n</mi><mi>v</mi></mrow></msub></math></span> of the hysteresis inversion, which is the main experimental result. The inverted hysteresis usually originates from the antiferromagnetic coupling between two magnetic phases. For Co<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>Sn<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>S<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> topological magnetic Weyl semimetal these phases are the ferromagnetic bulk and the spin-polarized topological surface states. Thus, the pronounced magnetocaloric effect at <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>i</mi><mi>n</mi><mi>v</mi></mrow></msub></math></span> is determined by the bulk magnetization switching by the exchange bias field of the surface spin-polarizad phase, in contrast to the ferromagnetic–paramagnetic transition at the Curie temperature <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>C</mi></mrow></msub></math></span>. For possible applications of magnetocaloric effect, Weyl semimetals open a new way to transfer from ferromagnetically ordered systems to the two-phase ones with the antiferromagnetic coupling between the bulk and surface spin-polarized phases without loss of efficiency. As the advantage we can point the higher reversibility and smaller energy costs at <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>i</mi><mi>n</mi><mi>v</mi></mrow></msub></math></span>.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"624 ","pages":"Article 172998"},"PeriodicalIF":2.5,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143792505","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}