Journal of Magnetism and Magnetic Materials最新文献

英文中文

Defect-engineered magnetism in conventional and Janus 2D vdW semiconducting monolayers: Benchmark insights from first-principles investigation 传统和Janus二维vdW半导体单层中的缺陷工程磁性：来自第一性原理研究的基准见解

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials

Pub Date : 2025-11-26 DOI: 10.1016/j.jmmm.2025.173714

Srijita Chakraborty , M. Ramesh , Manish K. Niranjan

Two-dimensional (2D) transition-metal dichalcogenides (TMDCs) and their Janus derivatives have emerged as promising platforms for next-generation spintronic and quantum technologies. In this work, we present a comprehensive first-principles investigation of 155 intrinsic defect configurations in MoS₂, MoSe₂, WS₂, and Janus MoSSe and WSSe monolayers. Our results reveal that intrinsic point defects can induce robust magnetism in WSSe without requiring transition-metal doping—an important contrast to earlier studies that focused primarily on extrinsic substitutions. We find that magnetic moments as high as 6

μ_{B}

in MoS₂ and up to 4

μ_{B}

in Janus TMDCs arise from symmetry breaking and the formation of localized mid-gap defect states. Furthermore, by mapping out the stability windows of vacancies, antisites, and vacancy complexes over a wide range of chemical potentials, we establish clear mechanistic connections between defect energetics and spin ordering. Importantly, several strong magnetic defects drive semiconductor-to-half-metal transitions, enabling spin-polarized electronic transport, while other configurations exhibiting weaker magnetism retain semiconducting character but with appreciably reduced bandgaps. Overall, this study provides a benchmark dataset and a defect-engineering roadmap for tailoring magnetic responses in 2D TMDCs. These insights offer actionable design strategies for realizing defect-driven spin functionality in future 2D spintronic and quantum devices.

二维（2D）过渡金属二硫族化合物（TMDCs）及其Janus衍生物已成为下一代自旋电子和量子技术的有前途的平台。在这项工作中，我们对MoS2， MoSe2, WS2， Janus MoSSe和WSSe单层中的155个固有缺陷构型进行了全面的第一性原理研究。我们的研究结果表明，在不需要添加过渡金属的情况下，内在点缺陷可以在WSSe中诱导出强大的磁性，这与早期主要关注外在取代的研究形成了重要对比。研究发现，由于对称破缺和局域中隙缺陷态的形成，MoS 2中磁矩高达6 μB， Janus TMDCs中磁矩高达4 μB。此外，通过绘制出空位、反位和空位配合物在大范围化学势下的稳定性窗口，我们在缺陷能量学和自旋有序之间建立了明确的机制联系。重要的是，几个强磁缺陷驱动半导体到半金属的转变，使自旋极化电子输运成为可能，而其他表现出较弱磁性的结构保留了半导体特性，但带隙明显减少。总的来说，本研究提供了一个基准数据集和一个缺陷工程路线图，用于定制二维TMDCs的磁响应。这些见解为在未来的二维自旋电子和量子器件中实现缺陷驱动自旋功能提供了可行的设计策略。

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引用次数: 0

Engineering of neodymium vacancies in NdCrO3 perovskites: Influence on physicochemical and magnetic properties for optoelectronic and spintronic applications NdCrO3钙钛矿中钕空位的工程：对光电和自旋电子应用的物理化学和磁性能的影响

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials

Pub Date : 2025-11-26 DOI: 10.1016/j.jmmm.2025.173723

Thabet Guesmi , Chadha Henchiri , Elena Navarro , Taoufik Mnasri , Jesús López- Sánchez , Hamida Gouadria , Miguel Fernández , Pilar Marín

This work reveals, for the first time, the effect of vacancy doping on the physico-chemical properties of the Nd_{1-x x}CrO₃ perovskite (x = 0, 0.2, 0.3) synthesized by the self-combustion method. Powder X-ray diffraction shows an orthorhombic crystal structure with a Pbnm space group. Scanning electronic microscopy (SEM) and transmission electronic microscopy (TEM) analyzes show that the particles reveal nanometric sizes and have a wide size distribution (48.54–158.77 nm). Based on Raman spectroscopy, the characteristic phonon modes corresponding to single-phase neodymium chromites were assigned. The energy gap Eg and the Urbach energy Eu were determined by UV–visible spectroscopy. With an Eg of 2.51 to 2.54 eV these materials offer advantages for applications in light-emitting devices. Magnetic analysis of Nd_0.70.3CrO₃ perovskite indicated G-type antiferromagnetic ordering at 225 K with weak ferromagnetism due to Dzyaloshinskii–Moriya interaction. Furthermore, it also shows that the Nd vacancy doping reduces the net ferromagnetic moment of the canted antiferromagnetic Cr³⁺ions, resulting in reduced magnetization, coercivity and exchange bias. Therefore, this material could also be suitable for applications in spintronics where controllable and tunable magnetic properties are desired.

本研究首次揭示了空位掺杂对自燃法合成的Nd1-x xCrO3钙钛矿（x = 0,0.2, 0.3）理化性质的影响。粉末x射线衍射显示为具有Pbnm空间群的正交晶体结构。扫描电镜（SEM）和透射电镜（TEM）分析表明，颗粒呈纳米级大小，粒径分布较宽（48.54 ~ 158.77 nm）。基于拉曼光谱，确定了单相钕铬铁矿的特征声子模式。用紫外可见光谱法测定了能隙Eg和乌尔巴赫能Eu。这些材料具有2.51至2.54 eV的Eg，为发光器件的应用提供了优势。对nd0.0.3 cro3钙钛矿的磁性分析表明，在225 K时，nd0.0.3 cro3钙钛矿呈g型反铁磁性有序，由于Dzyaloshinskii-Moriya相互作用具有弱铁磁性。此外，Nd空位掺杂降低了倾斜的反铁磁Cr3+离子的净铁磁矩，从而降低了磁化强度、矫顽力和交换偏置。因此，这种材料也可以适用于自旋电子学的应用，其中需要可控和可调的磁性。

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引用次数: 0

The lattice modulation and magnetic ferroelectric mechanism in multiferroics MnWO4 多铁质MnWO4的晶格调制及磁铁电机制

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials

Pub Date : 2025-11-26 DOI: 10.1016/j.jmmm.2025.173724

Yin Li

Magnetic and electric properties in multiferroics MnWO₄ are investigated by the use of quantum Green's function method. We strictly prove that the electric polarization

\vec{P}

results from improper magnetic order with elliptical spiral spins. The inverse Dzyaloshinskii-Moriya (DM) interaction induced by spin frustration plays an important role on its ferroelectric behavior in spiral spin phase. The nonlinear effect of spin waves cannot be ignored in our theory. Magnetic properties are greatly influenced by lattice modulation. The quantitative results are in agreement with experimental findings.

利用量子格林函数法研究了多铁性MnWO4的磁性和电学性质。严格证明了椭圆螺旋自旋下的电极化p→是由不正确的磁序引起的。自旋受挫诱导的逆Dzyaloshinskii-Moriya （DM）相互作用对其在螺旋自旋相中的铁电行为起着重要作用。自旋波的非线性效应在我们的理论中是不可忽视的。晶格调制对磁性有很大的影响。定量结果与实验结果一致。

引用次数: 0

Structural, magnetic and critical behavior of β-Mn type Co10−x/2Zn10−x/2Mnx (x = 0 and 2) alloys β-Mn型Co10−x/2Zn10−x/2Mnx （x = 0和2）合金的结构、磁性和临界行为

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials

Pub Date : 2025-11-25 DOI: 10.1016/j.jmmm.2025.173695

Pardeep , Lalita , P.D. Babu , G.A. Basheed

We report structural, magnetic and critical behavior of Co

_{10 - x / 2}

_{10 - x / 2}

_{x}

alloys for the nominal compositions of x = 0 and 2. Rietveld refinement reveals a

β

-Mn type chiral cubic structure (space group P4₁32) of both alloys. Magnetization measurements indicate that Mn substitution suppresses magnetic order. The magnetic behavior for the alloys with x = 0(2) has been studied in the critical region, from which the Curie temperature, T

_{c}

= 448.03(418.03) K and critical exponents:

β

= 0.368(0.375),

γ

= 1.382(1.386), and

δ

= 4.79(4.65) were determined. Detailed analysis suggests that the exponents are independent of the method of analysis and close to the theoretical prediction of the 3D nearest-neighbor Heisenberg model.

我们报道了Co10−x/2Zn10−x/2Mnx合金在标称成分x = 0和2时的结构、磁性和临界行为。Rietveld细化表明两种合金均具有β-Mn型手性立方结构（空间群P4132）。磁化测量表明，锰取代抑制了磁序。研究了x = 0(2)时合金在临界区的磁性行为，得到了居里温度、Tc = 448.03(418.03) K和临界指数：β = 0.368（0.375）、γ = 1.382（1.386）和δ = 4.79（4.65）。详细分析表明，指数与分析方法无关，接近三维最近邻海森堡模型的理论预测。

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引用次数: 0

The magneto-optical and magnetotransport properties of ferromagnetic GaAs structures delta-doped with Fe 掺铁的铁磁GaAs结构的磁光和磁输运性质

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials

Pub Date : 2025-11-25 DOI: 10.1016/j.jmmm.2025.173718

A.V. Kudrin, A.A. Yakovleva, V.P. Lesnikov, R.N. Kriukov, M.V. Dorokhin, D.A. Tatarskiy

The paper considers magneto-optical and magnetotransport properties of ferromagnetic Fe delta-doped GaAs structures formed by pulsed laser deposition in vacuum. The structures were obtained at the growth temperature of 200 °C. The layer concentration of Fe atoms in the delta-doping layer was 3–5∙10¹⁵ cm⁻² and a Curie temperature was ∼140 K. The transmission electron microscopy investigations have shown that the deposition of the Fe delta-layer with the thickness of ∼5 Å prior to the GaAs capping layer does not prevent the oriented crystalline growth. It was found that the conductivity of the Fe delta-doped GaAs structures was increased by the several orders of magnitude with an increase in the sheet concentration of Fe atoms in the delta-doping layer from 3∙10¹⁵ to 5∙10¹⁵ cm⁻². The spectral studies of a magnetic circular dichroism point at the intrinsic ferromagnetism associated with a GaAs:Fe magnetic semiconductor.

本文研究了脉冲激光真空沉积形成的铁磁掺铁砷化镓结构的磁光和磁输运性质。在200℃的生长温度下获得了这些结构。δ掺杂层中Fe原子的层浓度为3-5∙1015 cm−2，居里温度为~ 140 K。透射电镜研究表明，在GaAs盖层之前沉积厚度为~ 5 Å的Fe δ层并没有阻止取向晶体的生长。结果发现，随着δ掺杂层中Fe原子的薄片浓度从3∙1015增加到5∙1015 cm−2，Fe δ掺杂GaAs结构的电导率提高了几个数量级。GaAs:Fe磁性半导体固有铁磁性处磁圆二色性点的光谱研究。

引用次数: 0

Phase equilibria in the Ho-Fe-Rh ternary system at 600 °C and the magnetic properties of the related intermetallics 600℃时Ho-Fe-Rh三元体系的相平衡及相关金属间化合物的磁性能

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials

Pub Date : 2025-11-22 DOI: 10.1016/j.jmmm.2025.173692

Y.J. Wang , Y.S. Du , X.F. Wu , J. Wang , G. Cheng , J.T. Zhao , C.R. Li , G.H. Rao

To investigate the influence of Fe on the microstructure evolution of binary Ho–Rh alloys, the isothermal section of the Ho-Fe-Rh system at 600 °C is constructed based on the phase identification and analysis results from annealed alloys. In the present work, the solid solubilities of Fe in Ho₃Rh and HoRh₂ is approximately 5.5 and 19.5 at.%, and those of Rh in Fe₃Ho and Fe₂Ho is 3.0 and 9.6 at.%, respectively. The isothermal section contains 15 single-phase regions, 28 two-phase regions, and 14 three-phase regions. A new ternary compound τ is found with an initial composition Ho₁₂Fe₅₄Rh₃₄. The specific crystal structure needs to be further investigated. The magnetocaloric properties of HoRh and HoRh₂ are investigated. The corresponding paramagnetic Curie temperatures are −6.9 and -1.9 K, respectively, indicating that the antiferromagnetic exchange interaction plays a dominant role in the compounds HoRh and HoRh₂. A two-phase region consisting of HoRh and HoRh₂ is identified, therefore, the magnetic transition behaviors and magnetocaloric properties of samples in this composition range are thoroughly characterized. Especially, the 38Ho-7Fe-55Rh alloy exhibits a significant refrigeration capacity (350.3 J/kg) and a broad temperature-averaged entropy change (over 40 K) at low temperatures, suggesting its potential as a candidate material for magnetic refrigerators operating based on the Ericsson cycle. At the same time, the structural and magnetic properties of Fe_2-xRh_xHo (x = 0, 0.09, 0.18, 0.27) are studied. The Curie temperature decreases linearly with increasing Rh content, due to increased Fe–Fe atomic spacing which weakens the exchange coupling interaction.

为了研究Fe对二元Ho-Rh合金组织演变的影响，基于退火合金的相识别和分析结果，构建了600℃时Ho-Fe-Rh体系的等温截面。在本研究中，铁在Ho3Rh和HoRh2中的固溶度分别约为5.5和19.5 at。Rh在Fe3Ho和Fe2Ho中的比值分别为3.0和9.6 at。分别为%。等温剖面包含15个单相区、28个两相区和14个三相区。发现了一个新的三元化合物τ，其初始组成为Ho12Fe54Rh34。具体的晶体结构有待进一步研究。研究了HoRh和HoRh2的磁热学性质。对应的顺磁居里温度分别为- 6.9 K和-1.9 K，表明反铁磁交换作用在化合物HoRh和HoRh2中起主导作用。确定了由HoRh和HoRh₂组成的两相区域，从而对该组成范围内样品的磁转变行为和磁热性能进行了全面表征。特别是，38Ho-7Fe-55Rh合金在低温下表现出显著的制冷能力（350.3 J/kg）和广泛的温度平均熵变（超过40 K），表明其有潜力作为基于爱立信循环运行的磁冰箱的候选材料。同时，研究了Fe2-xRhxHo （x = 0,0.09, 0.18, 0.27）的结构和磁性能。居里温度随Rh含量的增加而线性降低，这是由于Fe-Fe原子间距的增加削弱了交换耦合作用。

{"title":"Phase equilibria in the Ho-Fe-Rh ternary system at 600 °C and the magnetic properties of the related intermetallics","authors":"Y.J. Wang , Y.S. Du , X.F. Wu , J. Wang , G. Cheng , J.T. Zhao , C.R. Li , G.H. Rao","doi":"10.1016/j.jmmm.2025.173692","DOIUrl":"10.1016/j.jmmm.2025.173692","url":null,"abstract":"<div><div>To investigate the influence of Fe on the microstructure evolution of binary Ho–Rh alloys, the isothermal section of the Ho-Fe-Rh system at 600 °C is constructed based on the phase identification and analysis results from annealed alloys. In the present work, the solid solubilities of Fe in Ho<sub>3</sub>Rh and HoRh<sub>2</sub> is approximately 5.5 and 19.5 at.%, and those of Rh in Fe<sub>3</sub>Ho and Fe<sub>2</sub>Ho is 3.0 and 9.6 at.%, respectively. The isothermal section contains 15 single-phase regions, 28 two-phase regions, and 14 three-phase regions. A new ternary compound τ is found with an initial composition Ho<sub>12</sub>Fe<sub>54</sub>Rh<sub>34</sub>. The specific crystal structure needs to be further investigated. The magnetocaloric properties of HoRh and HoRh<sub>2</sub> are investigated. The corresponding paramagnetic Curie temperatures are −6.9 and -1.9 K, respectively, indicating that the antiferromagnetic exchange interaction plays a dominant role in the compounds HoRh and HoRh<sub>2</sub>. A two-phase region consisting of HoRh and HoRh₂ is identified, therefore, the magnetic transition behaviors and magnetocaloric properties of samples in this composition range are thoroughly characterized. Especially, the 38Ho-7Fe-55Rh alloy exhibits a significant refrigeration capacity (350.3 J/kg) and a broad temperature-averaged entropy change (over 40 K) at low temperatures, suggesting its potential as a candidate material for magnetic refrigerators operating based on the Ericsson cycle. At the same time, the structural and magnetic properties of Fe<sub>2-<em>x</em></sub>Rh<sub><em>x</em></sub>Ho (<em>x</em> = 0, 0.09, 0.18, 0.27) are studied. The Curie temperature decreases linearly with increasing Rh content, due to increased Fe–Fe atomic spacing which weakens the exchange coupling interaction.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"638 ","pages":"Article 173692"},"PeriodicalIF":3.0,"publicationDate":"2025-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145600642","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

On the fully compensated ferrimagnetism in Mn2V1-xCoxAl (x = 0, 0.25, 0.5, 0.75, 1) Heusler alloys: An ab initio and neutron diffraction study Mn2V1-xCoxAl (x = 0,0.25, 0.5, 0.75, 1) Heusler合金的完全补偿铁磁性：从头算和中子衍射研究

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials

Pub Date : 2025-11-22 DOI: 10.1016/j.jmmm.2025.173715

P.V. Midhunlal , J. Arout Chelvane , C. Venkatesh , P.D. Babu , N. Harish Kumar

We present a detailed ab initio investigation on the interesting Heusler alloys Mn₂V_1-xCo_xAl (x=0,0.25,0.5,0.75,1), which exhibit fully compensated ferrimagnetism with high Curie temperature for x = 0.5. Calculations were performed by incorporating various atomic anti-site disorders, and the minimum energy structure causing the fully compensated ferrimagnetic state with high Curie temperature in Mn₂V_0.5Co_0.5Al was identified to be L2₁ with Mn-Co disorder. This L2₁ phase, along with the ferrimagnetic interaction among the parallelly coupled (Mn_(A)-Mn_(C)) and (V-Co) pairs, gives rise to the fully compensated ferrimagnetism in the half-metallic Mn₂V_0.5Co_0.5Al Heusler alloy. Increasing Co concentration in Mn₂VAl induces a change in structure from the L2₁ phase to the Xₐ phase. The peculiar spin gapless semiconducting behavior of Mn₂CoAl was evident from the ab initio results. Ab initio results have explained the previously reported anomalies in the electrical resistivity of Mn₂V_1-xCo_xAl. Neutron diffraction analysis has confirmed, for the first time, that Mn₂V_0.5Co_0.5Al has a disordered L2₁ structure, which agrees with the ab initio results.

本文对Heusler合金Mn2V1-xCoxAl （x=0,0.25,0.5,0.75,1）在x= 0.5时表现出高居里温度的完全补偿铁磁性进行了详细的从头算研究。结合各种原子反位紊乱进行了计算，确定了Mn2V0.5Co0.5Al中具有高居里温度的完全补偿铁磁态的最小能量结构为具有Mn-Co紊乱的L21。这种L21相与平行耦合的(Mn（A)-Mn(C)）和（V-Co）对之间的铁磁相互作用，在半金属Mn2V0.5Co0.5Al Heusler合金中产生了完全补偿的铁磁。Mn₂VAl中Co浓度的增加导致结构从L2 1相转变为X 1相。从头算结果表明，Mn2CoAl具有独特的自旋无间隙半导体特性。从头算结果解释了先前报道的Mn2V1-xCoxAl电阻率异常。中子衍射分析首次证实，Mn2V0.5Co0.5Al具有无序的L2₁结构，这与从头算结果一致。

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引用次数: 0

Encapsulation of carbonyl iron particles with LSR/2-methylimidazole for thermal stability and corrosion resistance enhancement. 用LSR/2-甲基咪唑包封羰基铁颗粒，提高热稳定性和耐腐蚀性。

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials

Pub Date : 2025-11-21 DOI: 10.1016/j.jmmm.2025.173694

G. Arunkumar , A. Deepa

Magnetorheological or magnetic response (MR) materials are surprisingly susceptible to corrosion when operated under various environmental conditions, such as salt, fog, humidity, and high temperatures, which can result in a decline in their performance. So, the development of composite coatings over MR materials will prevent performance degradation. In this research work, carbonyl iron (CI) particles are encapsulated with a hybrid coating consisting of 2-methylimidazole (2MEI) as the primary layer and LSR as the secondary layer over the surface of the carbonyl iron particles via an in-situ polymerisation technique. The material properties of composite powders (Cip, Cip@2MEI, Cip@2MEI@LSR), including thermal stability, magnetic stability, corrosion resistance, and hydrophobicity, were assessed. The Cip@2MEI@LSR exhibits enhanced thermal stability, hydrophobicity, and corrosion resistance when compared to other particles. The Tafel polarisation curve indicates that the corrosion potential (E_corr) of Cip@2MEI@LSR was shifted positively to −0.19 V, and the corrosion current density (I_corr) was decreased by two orders of magnitude when compared to Cip.

磁流变或磁响应（MR）材料在各种环境条件下（如盐、雾、湿度和高温）极易受到腐蚀，从而导致其性能下降。因此，在MR材料上开发复合涂层将防止性能下降。在本研究中，通过原位聚合技术将羰基铁（CI）颗粒包裹在由2-甲基咪唑（2MEI）作为第一层和LSR作为第二层组成的杂化涂层上。对复合粉末（Cip, Cip@2MEI, Cip@2MEI@LSR）的材料性能进行了评价，包括热稳定性、磁稳定性、耐腐蚀性和疏水性。与其他颗粒相比，Cip@2MEI@LSR具有更好的热稳定性、疏水性和耐腐蚀性。Tafel极化曲线表明，Cip@2MEI@LSR的腐蚀电位（Ecorr）正向移动至- 0.19 V，腐蚀电流密度（Icorr）比Cip降低了2个数量级。

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引用次数: 0

Arrayed amorphous wire sensing system for large-area magnetic beads detection 用于大面积磁珠检测的阵列非晶线传感系统

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials

Pub Date : 2025-11-21 DOI: 10.1016/j.jmmm.2025.173697

Zepeng Wang , Qianzhen Su , Jin Chen , Chao Zhang , Bo Zhang , Xiaolong Wen , Jianhua Li

Amorphous wire sensors exhibit significant potential for magnetic bead-based biological detection applications due to their high sensitivity to magnetic fields. However, the flexibility and structural heterogeneity of amorphous microwires hinder their integration into MEMS processes, and their detection area restricts their effectiveness in biological detection applications. To overcome these limitations, we proposed a novel magnetic bead detection system based on the amorphous microwire GMI sensor. The sensor operates based on the off-diagonal magneto-impedance effect, detecting magnetic beads by measuring the voltage change in a pick-up coil. This system utilizes microfabricated grooves on glass substrates to enable precise alignment and fixation of the microwires. To expand the sensing area, an array configuration was adopted. The sensor exhibited a resolution of 0.75nT, a sensitivity of 5.997 V/Oe, and a linearity of 99.97 % within ±0.75 Oe range. Furthermore, by integrating microfluidic technology, we constructed a real-time detection system for monitoring magnetic bead solutions. This system can monitor magnetic bead solutions at concentrations ranging from 1 to 50 μg/ml over an area of 11 mm × 7 mm.

非晶丝传感器由于对磁场的高灵敏度，在基于磁珠的生物检测应用中表现出巨大的潜力。然而，非晶微线的灵活性和结构的非均质性阻碍了其在MEMS工艺中的集成，其检测面积也限制了其在生物检测中的应用。为了克服这些限制，我们提出了一种基于非晶微线GMI传感器的新型磁珠检测系统。该传感器基于非对角线磁阻抗效应工作，通过测量拾取线圈中的电压变化来检测磁珠。该系统利用玻璃基板上的微加工凹槽来实现微线的精确对准和固定。为了扩大传感面积，采用了阵列结构。该传感器的分辨率为0.75 nt，灵敏度为5.997 V/Oe，在±0.75 Oe范围内线性度为99.97%。结合微流控技术，构建了磁珠溶液实时检测系统。该系统可以在11 mm × 7 mm的区域内监测浓度范围为1至50 μg/ml的磁珠溶液。

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引用次数: 0

Investigation of spin valve effect on Fe5GeTe2/MoS2/Fe5GeTe2 van der Waals heterostructures 自旋阀对Fe5GeTe2/MoS2/Fe5GeTe2范德华异质结构影响的研究

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials

Pub Date : 2025-11-21 DOI: 10.1016/j.jmmm.2025.173698

Jinmin Ding , Qianni Yang , Zongkui Tian , Jian Sun , Qinglin Xia , Ziyan Luo , Guanghua Guo

As a fundamental unit of magnetic random-access memory, spin valve (SV) has attracted substantial attention. Recently, the development of transition metal dichalcogenides (TMDs) and van der Waals (vdW) ferromagnetic materials offers opportunities to build up all-vdW SV without dangling bonds. Here, we report SV effect observed in Fe₅GeTe₂/MoS₂/Fe₅GeTe₂ device below 150 K. The platform width of this device at 10 K is 0.32 T, which is larger than that of most all-vdW SV devices. This increased platform width is attributed to the high sensitivity of the coercivity relying on Fe₅GeTe₂ thickness. Additionally, the magnetoresistance (MR) value of this device increases monotonically with decreasing temperature, reaching 0.68 % at 10 K, and the corresponding spin polarization is 5.4 %. The present work establishes a foundation for the development of all-vdW SV devices and multi-state memory.

自旋阀作为磁随机存储器的基本单元，受到了广泛的关注。近年来，过渡金属二硫族化合物（TMDs）和范德华（vdW）铁磁材料的发展为构建无悬空键的全vdW铁磁材料提供了机会。本文报道了在150 K以下Fe5GeTe2/MoS2/Fe5GeTe2器件中观察到的SV效应。该器件在10 K时的平台宽度为0.32 T，比大多数全vdw SV器件的平台宽度大。这种增加的平台宽度归因于依赖于Fe₅GeTe₂厚度的矫矫力的高灵敏度。此外，该器件的磁阻（MR）值随温度的降低而单调增加，在10 K时达到0.68%，对应的自旋极化率为5.4%。本工作为全vdw SV器件和多态存储器的发展奠定了基础。

引用次数: 0

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