Journal of Magnetism and Magnetic Materials最新文献

{"title":"Investigations on skyrmion racetrack dynamics in spin valve under the influence of DMI and current density for diode applications","authors":"Rishma Thilakaraj,&nbsp;Kanimozhi Natarajan,&nbsp;Amuda Rajamani,&nbsp;Brinda Arumugam","doi":"10.1016/j.jmmm.2025.173150","DOIUrl":"10.1016/j.jmmm.2025.173150","url":null,"abstract":"<div><div>Spintronic diodes can be superior over the conventional p-n junction diodes because of its benefits including low power consumption and high-speed data processing. In this study, a ferromagnetic spin valve-based symmetrical (rectangular) nanotrack and asymmetrical (rectangular with geometrically engineered bump structure) nanotrack are considered, to investigate the skyrmion motion, which is the key mechanism for supporting data transfer and data processing in spintronic devices. Here, the dynamics of the skyrmion is regulated by current density and Dzyaloshinskii-Moriya Interaction (DMI) in the designed geometry. The current density is adjusted in such a way that the skyrmion is effectively driven in unidirectional mode, thereby achieving the diode functionality. The proposed skyrmion motion showed a velocity of 220 m/s in symmetric nanotrack and average velocity of 315 m/s in asymmetric nanotrack, paving the way for the development of high-speed spintronic devices.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"627 ","pages":"Article 173150"},"PeriodicalIF":2.5,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143903655","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 properties of ferrimagnetic Co substituted Mn5Sn3 alloys","authors":"Mani Barathi A ,&nbsp;Athul S R ,&nbsp;Andrea Dzubinska ,&nbsp;Marian Reiffers ,&nbsp;Nagalakshmi Ramamoorthi","doi":"10.1016/j.jmmm.2025.173145","DOIUrl":"10.1016/j.jmmm.2025.173145","url":null,"abstract":"<div><div>Polycrystalline alloys of composition Mn_4.9Co_0.16Sn_2.33 (sample 1) and Mn_4.8Co_0.23Sn_2.38 (sample 2) were synthesized by arc melting. Both alloys have a hexagonal Ni₂In type crystal structure with a space group of <em>P6₃/mmc</em>. Both alloys show a magnetic transition from a paramagnetic to ferrimagnetic state with <em>T_c</em> = 234 K and <em>T_c</em> = 224 K for sample 1 and sample 2, respectively. These transitions lead to a maximum entropy change (<span><math><msubsup><mrow><mi>Δ</mi><mi>S</mi></mrow><mrow><mi>M</mi></mrow><mrow><mi>PK</mi></mrow></msubsup></math></span>) of 2.28 J/Kg.K and 2.26 J/Kg.K and a relative cooling power (RCP) of 225 J/kg and 185 J/kg at an applied magnetic field of 5 T for sample 1 and sample 2, respectively. These alloys show a considerable magnetocaloric behaviour comparable to materials of similar composition.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"627 ","pages":"Article 173145"},"PeriodicalIF":2.5,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143902126","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":"Beyond conventional storage: DFT and Monte Carlo investigation of low-temperature half-metallic perovskites for next-generation spintronics","authors":"A. Zaghrane ,&nbsp;H. Fatihi ,&nbsp;A. Abbassi ,&nbsp;S. Taj ,&nbsp;B. Manaut ,&nbsp;M. El Idrissi","doi":"10.1016/j.jmmm.2025.173101","DOIUrl":"10.1016/j.jmmm.2025.173101","url":null,"abstract":"<div><div>We present a comprehensive theoretical investigation of the structural, electronic, optical, and magnetic properties of <span><math><mrow><mi>C</mi><mi>s</mi><mi>S</mi><mi>r</mi><msub><mrow><mi>O</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math></span> and <span><math><mrow><mi>R</mi><mi>b</mi><mi>S</mi><mi>r</mi><msub><mrow><mi>O</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math></span> perovskites using first-principles density functional theory (DFT) calculations combined with Monte Carlo simulations. Our findings reveal that both compounds exhibit remarkable half-metallic ferromagnetic behavior, with <span><math><mrow><mi>C</mi><mi>s</mi><mi>S</mi><mi>r</mi><msub><mrow><mi>O</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math></span> displaying spin-polarized band gaps of 9.558 eV and 0 eV for spin-up and spin-down channels, respectively, while <span><math><mrow><mi>R</mi><mi>b</mi><mi>S</mi><mi>r</mi><msub><mrow><mi>O</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math></span> shows corresponding gaps of 9.982 eV and 0 eV. The phonon dispersion calculations and formation energy values confirm both dynamic and thermodynamic stability of these structures. Monte Carlo simulations predict Curie temperatures of 75.3 K for <span><math><mrow><mi>C</mi><mi>s</mi><mi>S</mi><mi>r</mi><msub><mrow><mi>O</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math></span> and 60 K for <span><math><mrow><mi>R</mi><mi>b</mi><mi>S</mi><mi>r</mi><msub><mrow><mi>O</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math></span>, indicating robust ferromagnetic ordering at low temperatures. Although these transition temperatures fall below room temperature, the coexistence of half-metallicity and ferromagnetism in these perovskite compounds is intriguing for low-temperature spintronic applications.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"627 ","pages":"Article 173101"},"PeriodicalIF":2.5,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143894496","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":"Formation mechanism of unusual stand-off dislocations in yttrium iron garnet films","authors":"Ying Meng ,&nbsp;Peng Chen ,&nbsp;Xinwei Yi ,&nbsp;Xiangfei Li ,&nbsp;Haoyu Zhuang ,&nbsp;Luyao Wang ,&nbsp;Xi Shen ,&nbsp;Gang Su ,&nbsp;Xiufeng Han ,&nbsp;Richeng Yu","doi":"10.1016/j.jmmm.2025.173133","DOIUrl":"10.1016/j.jmmm.2025.173133","url":null,"abstract":"<div><div>Stand-off dislocations, where the dislocation cores are within the film or substrate rather than exactly at the interface, are rare in epitaxial systems. Here, we systematically investigate the formation mechanism of the stand-off dislocations in yttrium iron garnet (YIG) films combining transmission electron microscopy analyses and density functional theory (DFT) calculations. Owing to lattice mismatch and thermal mismatch during high-temperature annealing, YIG films form columnar grain structures with two types of partial edge dislocations that stand off inside the substrate as grain boundaries. DFT calculations show that this stand-off behavior is attributed to the lower shear modulus of the substrate and the small in-plane stress at the interface. The different stand-off equilibrium positions of these dislocations are due to their distinct chemical compositions. Our work deepens the understanding of the physical mechanism behind the stand-off dislocations and offers insights for preparing high-quality films by controlling the positions of dislocation cores.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"627 ","pages":"Article 173133"},"PeriodicalIF":2.5,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143907552","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":"Additive manufacturing of soft magnetic high entropy alloys: A review","authors":"Puskar Pathak ,&nbsp;Mohan Sai Kiran Kumar Yadav Nartu","doi":"10.1016/j.jmmm.2025.173148","DOIUrl":"10.1016/j.jmmm.2025.173148","url":null,"abstract":"<div><div>Additive manufacturing (AM) offers unique advantages in fabricating soft magnetic high-entropy alloys (HEAs), enabling precise control over material properties and the development of advanced components for applications such as magnetic cores, electric motors, and transformers. These HEAs exhibit superior magnetic performance, mechanical strength, and thermal stability, making them highly suitable for modern electronics applications. This review explores the advancements in AM-processed soft magnetic HEAs, including ongoing research on process optimization, tailored microstructures, and enhanced magnetic properties. It emphasizes the importance of understanding the correlations between AM process parameters, resulting microstructures, and the soft magnetic properties of HEAs. By summarizing the state of the field, we provide insights into current progress and highlight future research trends, focusing on the potential for industrial adoption and advancements in this emerging area.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"627 ","pages":"Article 173148"},"PeriodicalIF":2.5,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143899018","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":"Observation and mitigation of dimensional resonance in thick electroinfiltrated nanocomposites","authors":"Sai Pranesh Amirisetti ,&nbsp;Connor S. Smith ,&nbsp;Sara C. Mills ,&nbsp;Jennifer S. Andrew ,&nbsp;David P. Arnold","doi":"10.1016/j.jmmm.2025.173084","DOIUrl":"10.1016/j.jmmm.2025.173084","url":null,"abstract":"<div><div>Magnetic nanocomposites have applications in power electronics, where properties such as high permeability, high film thickness, high operating frequency, and low loss are desired. Recent work shows that electroinfiltration, where a magnetic composite is formed by electroplating a metal through a deposited nanoparticle layer, produces magnetic composites with high permeabilities and low losses. However, electroinfiltration of single layers has so far been limited to film thicknesses <span><math><mrow><mo>≤</mo><mn>4</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span>. Thicker films have been achieved by successive deposition of composite layers, but material measurements reveal a trade-off between composite thickness and maximum operating frequency.This trade-off is attributed to dimensional resonance, caused by the formation of standing waves in the material cross-section. Laminations with electrically insulating interlayers can be used to overcome this effect, since the resulting laminated layers have smaller cross-sections that increase the frequency at which standing waves begin to form. This work demonstrates a process to create thick magnetic composites by laminating layers of infiltrated magnetic composite with insulating layers of either parylene or silicon dioxide to reduce dimensional resonance effects. Iron-oxide nanoparticles infiltrated with nickel are used. Four samples are made, containing 1, 2, 3, and 5 layers of magnetic composite, separated from each other by approximately 1–2.5<!--> <span><math><mi>μ</mi></math></span>m of parylene or 100 nm of SiO₂. Structural characterization of these samples using SEM with EDS capabilities shows that the desired laminated structures were achieved.Next, DC magnetic characterization shows that the magnetic saturation of the material decreases due to the introduction of the non-magnetic laminations. Finally, AC magnetic measurements reveal that the laminated composites have a constant dimensional resonance of approximately 350 MHz, irrespective of the number of layers and total film thickness.The conclusion is that laminating the nanocomposites reduces the effects of dimensional resonance, thereby facilitating thicker electroinfiltrated films while maintaining exceptional high-frequency performance.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"627 ","pages":"Article 173084"},"PeriodicalIF":2.5,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143894495","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":"Rapid phase formation and magnetocaloric properties of off-stoichiometric LaCe0.3Fe11Co0.8Si1.2 strip-casting flakes","authors":"H.X. Yu ,&nbsp;X.C. Zhong ,&nbsp;X. Huang ,&nbsp;J.H. Huang ,&nbsp;C.L. Liu ,&nbsp;Y.D. Zhang ,&nbsp;Z.W. Liu ,&nbsp;R.V. Ramanujan","doi":"10.1016/j.jmmm.2025.173134","DOIUrl":"10.1016/j.jmmm.2025.173134","url":null,"abstract":"<div><div>The rapid phase formation and magnetocaloric properties of LaCe_0.3Fe₁₁Co_0.8Si_1.2 strip-casting flakes annealed at 1373 K for durations varying from 2 min to 24 h were investigated. The rare earth elements refined the microstructure into a fine lamellar structure, which promoted the formation of the NaZn₁₃-type structure (1:13) phase. Consequently, a high 1:13 phase content of 88.5 wt% was obtained within only 5 min at 1373 K. The Johnson-Mehl-Avrami-Kolmogorov (JMAK) fitting results revealed that the rapid formation of the 1:13 phase resulted from the thickening of large lamellar precipitates. After annealing for 6 h, the maximum 1:13 phase content of 95.6 wt% was obtained, along with a maximum magnetic entropy change (−Δ<em>S</em>_M)^max of 10.6 J·kg⁻¹·K⁻¹ and a relative cooling power (<em>RCP</em>) of 151.6 J·kg⁻¹ (Δ<em>μ₀H</em> = 2 T). The large (−Δ<em>S</em>_M)^max and <em>RCP</em> values, as well as short annealing time, make these alloys promising candidates as magnetic refrigerants for near room temperature applications.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"627 ","pages":"Article 173134"},"PeriodicalIF":2.5,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143899013","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":"Circular domain walls in submicron magnetite particles","authors":"N.A. Usov ,&nbsp;O.N. Serebryakova ,&nbsp;M.S. Nesmeyanov","doi":"10.1016/j.jmmm.2025.173081","DOIUrl":"10.1016/j.jmmm.2025.173081","url":null,"abstract":"<div><div>Magnetization distributions in spherical magnetite particles in the diameter range <em>D</em> = 100–500 nm are calculated using numerical simulation. Two types of vortex micromagnetic states with close total energies are found, in which the vortex axis is parallel to one of the easy or one of the hard axes of cubic magnetic anisotropy of magnetite, respectively. It is shown that in the diameter range <em>D</em> &gt; 200 nm the vortex states of both types are transformed into circular domain walls of different structures. As a result, the reduced remanent magnetization of spherical magnetite particles sharply decreases with increasing particle diameter and becomes less than 0.03 at <em>D</em> ≥ 400 nm.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"627 ","pages":"Article 173081"},"PeriodicalIF":2.5,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143902031","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":"Erbium-doped β-Ga2O3: Insights into doping-induced structural, magnetic, and optical property modifications","authors":"Anju Babu,&nbsp;N. Madhusudhana Rao","doi":"10.1016/j.jmmm.2025.173113","DOIUrl":"10.1016/j.jmmm.2025.173113","url":null,"abstract":"<div><div>This study analyzes the doping-induced structural, magnetic, and optical property modification of β-Ga₂O₃ powder samples doped with erbium ions at 0, 1, 3, and 5 M%, synthesized via a hydrothermal method. X-ray diffraction analysis verified the presence of a single-phase monoclinic β-Ga₂O₃ across all the samples with a minor Er₃GaO₆ phase, exceptionally in samples doped with Er at 5 M%. X-ray photoelectron spectroscopy (XPS) analysis confirmed the presence of Ga, O, and Er in the prepared samples, with Ga and Er exhibiting a +3 oxidation state. Scanning electron microscopy (SEM) analysis revealed the surface morphology of the samples. Energy dispersive X-ray spectroscopy (EDX) analysis verified the presence of gallium, oxygen, and erbium in the doped samples. UV–Vis absorbance studies and Tauc plot analysis indicated a reduction in absorbance and bandgap with doping.. Electron paramagnetic resonance (EPR) spectra indicated the presence of paramagnetic centers related to singly ionized oxygen vacancies. Photoluminescence studies (PL) in the UV–Vis region revealed characteristic emission peaks of β-Ga₂O₃ and erbium ions. Fluorescence lifetime analysis showed an increase in fluorescence lifetime with increasing Er concentration. Magnetic measurements at room temperature demonstrated a change in pure β-Ga₂O₃ from a diamagnetic to a paramagnetic state upon erbium doping.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"627 ","pages":"Article 173113"},"PeriodicalIF":2.5,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143899015","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":"Negative rotatable anisotropy in Py/Gd/IrMn structures","authors":"I.L.C. Merino ,&nbsp;M.A. Sousa ,&nbsp;Liying Liu ,&nbsp;F.J. Litterst ,&nbsp;E.C. Passamani ,&nbsp;M.S. Pessoa ,&nbsp;L.C. Figueiredo ,&nbsp;E. Baggio-Saitovitch","doi":"10.1016/j.jmmm.2025.173131","DOIUrl":"10.1016/j.jmmm.2025.173131","url":null,"abstract":"<div><div>Interfacial magnetic couplings in Co/Gd/IrMn and Py/Gd/IrMn heterostructures with Gd thicknesses varying between 8 to 16 nm were systematically investigated using magnetization and ferromagnetic resonance (FMR) experiments. By fitting experimental data of the resonance field with uniaxial, rotatable and exchange anisotropies and analyzing the behavior of FMR linewidth as a function of Gd thickness, we demonstrated that in an external field and at room temperature (RT), the Py and Gd interfacial spins are coupled antiparallel, while the Co and Gd spins are aligned parallel. Our results indicate that these Gd spins are magnetically ordered at RT while expected to be paramagnetic in bulk state.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"628 ","pages":"Article 173131"},"PeriodicalIF":2.5,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143928537","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}