Journal of Magnetism and Magnetic Materials最新文献_第8页

Microwave-assisted rapid synthesis of NiCo2O4 with high-performance electromagnetic wave absorption 微波辅助下高效电磁波吸收NiCo2O4的快速合成

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-05-30 DOI: 10.1016/j.jmmm.2025.173207

Yujin Duan , Zijun Xie , Miaomiao Du , Xianting Feng , Qing Chang

{"title":"Microwave-assisted rapid synthesis of NiCo2O4 with high-performance electromagnetic wave absorption","authors":"Yujin Duan , Zijun Xie , Miaomiao Du , Xianting Feng , Qing Chang","doi":"10.1016/j.jmmm.2025.173207","DOIUrl":"10.1016/j.jmmm.2025.173207","url":null,"abstract":"<div><div>Despite the prosperous development in synthesis methods and electromagnetic wave absorption performance of NiCo2O4, the green and rapid synthesis process of high-performance NiCo2O4 with large-scale production is still lack so far. Herein, a microwave-assisted rapid synthesis method was proposed for the first time to harvest NiCo2O4, which shortened the preparation time of precursor to 90 s and significantly improved the production efficiency. The type of metal salts and cosolvents were optimized to explore the dominant loss mechanism and improve the electromagnetic wave absorption performance of NiCo2O4. The best performance appears in the sample resulting from acetates and ethanol (A-Et), with an effective absorption bandwidth of 6.24 GHz (1.9 mm), and minimum reflection loss of −40.40 dB (5.24 GHz, 3.0 mm). The existence of oxygen vacancy and lattice defect dominate the electromagnetic wave loss mechanism of A-Et. This study provides a new insight for the rapid green synthesis of high-performance NiCo2O4.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173207"},"PeriodicalIF":2.5,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144212900","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

Noise characterization of STT-based Nanoscale magnetic tunnel junction magnetic sensors 基于stt的纳米磁性隧道结磁传感器的噪声特性研究

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-05-29 DOI: 10.1016/j.jmmm.2025.173215

Kosuke Komuro , Hugo Nicolas , Bernard Dieny , Daiki Oshima , Takeshi. Kato , Ricardo C. Sousa

{"title":"Noise characterization of STT-based Nanoscale magnetic tunnel junction magnetic sensors","authors":"Kosuke Komuro , Hugo Nicolas , Bernard Dieny , Daiki Oshima , Takeshi. Kato , Ricardo C. Sousa","doi":"10.1016/j.jmmm.2025.173215","DOIUrl":"10.1016/j.jmmm.2025.173215","url":null,"abstract":"<div><div>Recently, the trend towards electrification has led to the widespread use of magnetic sensors in various applications. Magnetic tunnel junction (MTJ)-based magnetic sensors exhibiting very high sensitivity, compactness, and small dimensions could offer significant advantages over existing technologies such as conventional Hall effect sensors. New sensor concepts have been explored such as spin transfer torque (STT)-based MTJ magnetic sensors which have the potential to enable magnetic field detection with fine spatial resolutions of 50 to 100 nm and micro-Tesla resolution. This paper analyzes and describes the noise characteristics of STT-based MTJ sensors. Calculations and experimental results demonstrate that the signal-to-noise ratio (SNR) of the STT-based MTJ sensor is proportional to the square of the thermal stability factor, which is the ratio of the energy barrier of magnetization reversal and the thermal energy. This finding opens the way for future advances through predictive modelling of the sensing element and a deeper understanding of the noise sources in the proposed device.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173215"},"PeriodicalIF":2.5,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144240166","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

Improved properties of Fe-Ni-Mo soft magnetic composites via particle surface modification 颗粒表面改性改善Fe-Ni-Mo软磁复合材料性能

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-05-29 DOI: 10.1016/j.jmmm.2025.173220

Qi Li , Zhangqiao Zhou , Yan Nie , Lu Yang , Yu Wang , Jinsong Chen , Xian Wang

{"title":"Improved properties of Fe-Ni-Mo soft magnetic composites via particle surface modification","authors":"Qi Li , Zhangqiao Zhou , Yan Nie , Lu Yang , Yu Wang , Jinsong Chen , Xian Wang","doi":"10.1016/j.jmmm.2025.173220","DOIUrl":"10.1016/j.jmmm.2025.173220","url":null,"abstract":"<div><div>The preparation of soft magnetic composites requires effective surface modification of alloy powder to enhance insulating properties and achieve dense, uniform coating layers. Firstly, the gas-atomized Fe-Ni-Mo powder was surface modified using the atomic layer deposition method, forming a uniform and dense Al2O3 insulating layer. The secondary surface modification of organic polymers further improves the properties of soft magnetic composites. This study systematically evaluates the effects of the primary and secondary surface modification on the properties of powder particles and soft magnetic composites. The primary modification generates an extremely thin insulating layer of approximately 2.5 nm, which increases the particle resistivity by 9 orders of magnitude. The permeability frequency stability of the soft magnetic composites increased from 11.3 % to 96.5 %, resulting in significant core loss reduction. The secondary modification effectively enhances the formability of soft magnetic composites. Optimal permeability of 242.7 at 1 kHz is achieved, maintaining 95.2 % frequency stability up to 1 MHz, while core loss remains below 570 mW cm−3 under 100 kHz/100 mT conditions. The surface treatment method in this work can provide a reference for the surface insulation modification of soft magnetic composites.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173220"},"PeriodicalIF":2.5,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144203083","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

Viable scaling mechanism ensuing anomalous Hall effect in Si/Ni multilayers from 2 K-300 K 在2 K-300 K范围内Si/Ni多层膜中产生异常霍尔效应的可行结垢机制

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-05-29 DOI: 10.1016/j.jmmm.2025.173222

Dushyant Singh , Shivesh Yadav , Krista R. Khiangte

{"title":"Viable scaling mechanism ensuing anomalous Hall effect in Si/Ni multilayers from 2 K-300 K","authors":"Dushyant Singh , Shivesh Yadav , Krista R. Khiangte","doi":"10.1016/j.jmmm.2025.173222","DOIUrl":"10.1016/j.jmmm.2025.173222","url":null,"abstract":"<div><div>A systematic study of the scaling mechanisms driving the anomalous Hall effect (AHE) in Si/Ni multilayers was conducted from 2 K to 300 K on <math><msub><mrow><mo>[</mo><mi>S</mi><mi>i</mi><mrow><mo>(</mo><mn>40</mn><mi>Å</mi><mo>)</mo></mrow><mo>/</mo><mi>N</mi><mi>i</mi><mrow><mo>(</mo><msub><mi>t</mi><mrow><mi>N</mi><mi>i</mi></mrow></msub><mi>Å</mi><mo>)</mo></mrow><mo>]</mo></mrow><mn>20</mn></msub></math> multilayers. Structural analysis revealed polycrystalline Ni layers and amorphous Si layers. As <math><msub><mi>t</mi><mrow><mi>N</mi><mi>i</mi></mrow></msub></math> decreased, Ni nanocrystallite size reduced, while the surface-to-volume ratio and Si/Ni interface roughness increased. Multilayers with <math><mrow><msub><mi>t</mi><mrow><mi>N</mi><mi>i</mi></mrow></msub><mo>≥</mo><mn>40</mn><mi>Å</mi></mrow></math> exhibited ferromagnetic behavior, while those with <math><mrow><msub><mi>t</mi><mrow><mi>N</mi><mi>i</mi></mrow></msub><mo><</mo><mn>40</mn><mi>Å</mi></mrow></math> were superparamagnetic. Decreasing <math><msub><mi>t</mi><mrow><mi>N</mi><mi>i</mi></mrow></msub></math> also increased longitudinal resistivity due to enhanced interface roughness, higher surface-to-volume ratio, and increased tunneling between Ni nanocrystallites. AHE studies showed that Hall resistance peaked with decreasing <math><msub><mi>t</mi><mrow><mi>N</mi><mi>i</mi></mrow></msub></math> but declined for <math><mrow><msub><mi>t</mi><mrow><mi>N</mi><mi>i</mi></mrow></msub><mo><</mo><mn>40</mn><mi>Å</mi></mrow></math>, due to superparamagnetism. Skew scattering dominated Hall resistance enhancement at all temperatures, but as the temperature increased from 2 K to 300 K, a transition from skew scattering to the side-jump mechanism was observed.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173222"},"PeriodicalIF":2.5,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144178806","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 strategy for improving inherent brittleness without significantly sacrificing the magnetocaloric effect in a Ni-Mn-Sn Heusler alloy 提高Ni-Mn-Sn Heusler合金固有脆性而不显著牺牲磁热效应的策略

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-05-28 DOI: 10.1016/j.jmmm.2025.173246

Qiang Zhai , Fan Bu , Yuhao Cheng , Jiaqi Zhang , Yixuan He

{"title":"A strategy for improving inherent brittleness without significantly sacrificing the magnetocaloric effect in a Ni-Mn-Sn Heusler alloy","authors":"Qiang Zhai , Fan Bu , Yuhao Cheng , Jiaqi Zhang , Yixuan He","doi":"10.1016/j.jmmm.2025.173246","DOIUrl":"10.1016/j.jmmm.2025.173246","url":null,"abstract":"<div><div>The eutectic design, a prevalent strategy for enhancing mechanical properties, aims to address the poor workability caused by the high brittleness of L21 intermetallic phase in Ni-Mn-Sn Heusler alloy as a promising material for solid-state refrigeration. In this study, a eutectic composition of Ni48Co10Mn32Sn10 with a fully L21/γ lamellar structure significantly improves mechanical properties, reaching 1950 MPa fracture strength and 20.5 % ductility. However, the desired magnetocaloric effect (MCE) is completely inhibited due to a strong Kurdyumov and Sachs orientation relationship (K-S OR) between eutectic phases. To overcome these challenges, a solution to precipitate primary L21 phase is proposed. This approach breaks the K-S OR by promoting epitaxial growth of the L21 eutectic phase on the primary L21 phase. Consequently, the hypoeutectic Ni48Co8Mn34Sn10 composition achieves an excellent balance between MCE and mechanical properties, with a maximum magnetic entropy change of 10.13 J kg−1 K−1 under 5 T magnetic field, 1894 MPa fracture strength, and 18.4 % ductility. Our strategy overcomes inherent brittleness without significantly sacrificing the magnetocaloric effect within Ni-Mn-Sn alloys. This study is pivotal for optimizing the structural design and properties of Ni-Mn based Heusler alloys.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173246"},"PeriodicalIF":2.5,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168352","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

Classification of magnetic behavior in annealed rapid-quenched (Sm0.8Zr0.2)1.1(Fe0.9Co0.1)11.3Ti0.7 magnet powders using the stepwise measurement of the remanent magnetization 用剩余磁化强度的逐步测量方法对退火快淬（Sm0.8Zr0.2）1.1(Fe0.9Co0.1)11.3Ti0.7磁铁粉末的磁性行为进行分类

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-05-28 DOI: 10.1016/j.jmmm.2025.173242

K. Kobayashi, T. Kuno, H. Fujiwara

{"title":"Classification of magnetic behavior in annealed rapid-quenched (Sm0.8Zr0.2)1.1(Fe0.9Co0.1)11.3Ti0.7 magnet powders using the stepwise measurement of the remanent magnetization","authors":"K. Kobayashi, T. Kuno, H. Fujiwara","doi":"10.1016/j.jmmm.2025.173242","DOIUrl":"10.1016/j.jmmm.2025.173242","url":null,"abstract":"<div><div>(Sm0.8Zr0.2)1.1(Fe0.9Co0.1)11.3Ti0.7 amorphous starting compound was annealed at typical temperatures of 750, 850, and 950 °C for 30 min. The obtained samples were magnetically isotropic. The highest coercivity (Hc) of 413 kA/m was found in the 850 °C/30 min sample, in which Js = 1.43 T and Ha = 5.93 MA/m, whereas that in the 950 °C/30 min sample, in which Js = 1.47 T and Ha = 9.21 MA/m, Hc was 246 kA/m. The obvious character of the latter sample was a multi-domain structure (MDS) in a thermally demagnetized state as observed by magneto-force microscopy, whereas a single-domain like structure (SDLS) was observed in the former and in the 750 °C/30 min (Ha = 4.41 MA/m and Hc = 216 kA/m) samples. Since we hypothesized that lower Hc in the higher Ha 950 °C/30 min sample originated from domain wall motion in the MDS, we attempted to determine the volume fraction of the MDS region in the sample. Using the modified step method for magnetically isotropic samples, we detected about 50 vol% of the MDS region in the 950 °C/30 min sample, compared with about 20 vol% in the other two samples.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173242"},"PeriodicalIF":2.5,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144220855","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 effect of Ni2+ substitution by Mn2+ on the initial magnetic permeability and curie temperature in solid solutions of Mn1-xNixFe2O4 用Mn2+取代Ni2+对Mn1-xNixFe2O4固溶体初始磁导率和居里温度的影响

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-05-27 DOI: 10.1016/j.jmmm.2025.173223

N.A. Cherkasova , V.E. Zhivulin , D.S. Afanasyev , G.M. Zirnik , D.A. Uchaev , S.A. Gudkova , D.A. Vinnik

引用次数: 0

Novel graphite-coated La(Fe, Si)13Hy plates for magnetocaloric cooling 磁热冷却用新型石墨包覆La(Fe, Si)13Hy板

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-05-24 DOI: 10.1016/j.jmmm.2025.173219

Zhen Yan , Naikun Sun , Xinguo Zhao , Haoyu Wang , Bing Li , Juan Cheng , Jiaohong Huang , Fuchun Chang , Yingwei Song

{"title":"Novel graphite-coated La(Fe, Si)13Hy plates for magnetocaloric cooling","authors":"Zhen Yan , Naikun Sun , Xinguo Zhao , Haoyu Wang , Bing Li , Juan Cheng , Jiaohong Huang , Fuchun Chang , Yingwei Song","doi":"10.1016/j.jmmm.2025.173219","DOIUrl":"10.1016/j.jmmm.2025.173219","url":null,"abstract":"<div><div>La(Fe, Si)13 hydrides suffer from intrinsically poor mechanical, anti-corrosive and thermally conductive properties, which impede their implementation as efficient regenerators. The current improvement strategies are faced with difficult trade-offs among these properties. In this work, we developed a facile chemical vapor deposition (CVD) method for low-temperature in-situ deposition of a thin graphitic layer of ∼ 200 nm on La0.8Ce0.2FexMn0.215Si1.3 plates of 0.5–1 mm thickness by evaporating polyethylene glycol (PEG) polymer as a solid carbon source. These plates could be machined directly from their casting ingot due to the mechanical property enhancement from ∼ 3–6 wt% α-Fe. Favorably, these graphite-coated plates could be successfully fully hydrogenated at atmospheric pressure for room-temperature application. The ∼ 0.03 wt% graphite coating could endow the composites with striking anti-corrosive properties with the sum of the film resistance and the charge transfer resistance increasing from 105 (for the graphite-free hydride) to 11298 Ω·cm2 by more than two orders of magnitude. Moreover, these graphite composites exhibit large room-temperature magnetic entropy change ΔSM of 8.7 J/kg•K in 0–1.5 T and high thermal conductivity λ of 7.9–8.6 W/Km compared with the corresponding values of 3.5 J/kg•K and 9.5 W/Km for the prototype room-temperature magnetocaloric material Gd. The intriguing functionality of the graphite coating may advance the practical application of La(Fe, Si)13-based materials.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"628 ","pages":"Article 173219"},"PeriodicalIF":2.5,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144131761","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

Numerical simulation of nonequilibrium critical behavior of the weakly disordered three-spin-state Potts model 弱无序三自旋态波茨模型非平衡临界行为的数值模拟

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-05-24 DOI: 10.1016/j.jmmm.2025.173174

Borodikhin V.N.

引用次数: 0

Co2+ doped zinc manganese ferrite nanoparticles for magnetic induction hyperthermia 用于磁感应热疗的Co2+掺杂锌锰铁氧体纳米颗粒

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2025-05-23 DOI: 10.1016/j.jmmm.2025.173216

Suwanan Thammarong , Xiaogang Yu , Peinan Yin , Renpeng Yang , Wei Zhang

引用次数: 0