Magnetochemistry最新文献_第10页

Substitution Effects in Spin-Polarized (Cr4-xFex)0.5AC (A = Ge, Si, Al) MAX Phases 自旋极化（Cr4-xFex）0.5AC（A=Ge，Si，Al）MAX相中的取代效应

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-05-30 DOI: 10.3390/magnetochemistry9060147

N. A. Fedorova, A. V. Kovaleva, J. S. Olshevskaya, Daria A. Ivanova, V. V. Kozak, A. Shubin, A. Tarasov, S. Varnakov, S. Ovchinnikov, E. Moshkina, O. Maximova, P. Avramov, F. Tomilin

{"title":"Substitution Effects in Spin-Polarized (Cr4-xFex)0.5AC (A = Ge, Si, Al) MAX Phases","authors":"N. A. Fedorova, A. V. Kovaleva, J. S. Olshevskaya, Daria A. Ivanova, V. V. Kozak, A. Shubin, A. Tarasov, S. Varnakov, S. Ovchinnikov, E. Moshkina, O. Maximova, P. Avramov, F. Tomilin","doi":"10.3390/magnetochemistry9060147","DOIUrl":"https://doi.org/10.3390/magnetochemistry9060147","url":null,"abstract":"The use of spintronic devices with a tunable magnetic order on small scales is highly important for novel applications. The MAX phases containing transition metals and/or magnetic ion-substituted lattices attract a lot of attention. In this study, the magnetic and electronic properties of (Cr4-xFex)0.5AC (A = Ge, Si, Al) compounds were predicted and investigated within the density functional theory. It was established that single-substituted (Cr3Fe1)0.5AC (A = Ge, Si, Al) lattices are favorable in terms of energy. An analysis of the magnetic states of the MAX phases demonstrated that their spin order changes upon substitution of iron atoms for chromium ones. It was found that mostly the (Cr4-xFex)0.5GeC and (Cr4-xFex)0.5AlC lattices acquire a ferrimagnetic state in contrast to (Cr4-xFex)0.5SiC for which the ferromagnetic spin order dominates. It was pointed out that the atomic substitution could be an efficient way to tune the magnetic properties of proposed (Cr4-xFex)0.5AC (A = Ge, Si, Al) MAX phases.","PeriodicalId":18194,"journal":{"name":"Magnetochemistry","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43454351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fabrication and Soft Magnetic Properties of Fe–Si–Cr Composites with Double-Insulating Layers Suitable for High-Frequency Power Applications 高频电源用双绝缘层Fe-Si-Cr复合材料的制备及其软磁性能

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-05-30 DOI: 10.3390/magnetochemistry9060145

Z. Huang, Huaqin Huang, Hao He, Kaixuan Li, Zhaoyang Wu, Rui Wang

{"title":"Fabrication and Soft Magnetic Properties of Fe–Si–Cr Composites with Double-Insulating Layers Suitable for High-Frequency Power Applications","authors":"Z. Huang, Huaqin Huang, Hao He, Kaixuan Li, Zhaoyang Wu, Rui Wang","doi":"10.3390/magnetochemistry9060145","DOIUrl":"https://doi.org/10.3390/magnetochemistry9060145","url":null,"abstract":"Soft magnetic composites (SMCs) are composed of alloy materials with the core and insulating layers as the shell. These composites exhibit high saturation magnetic sensitivity and low hysteresis loss, making them a promising material for various applications. The investigation of double layers is considered valuable as it can effectively address the issues of low resistivity and high dynamic loss that arise from non-uniform insulating layers in SMCs. In this study, Fe-Si-Cr/SiO2 particles with a core–shell heterostructure were produced via chemical vapor deposition (CVD). The Fe-Si-Cr/SiO2 materials were coated with different weight percentages (1–6%) of sodium silicate (SS). Subsequently, Fe-Si-Cr-based SMCs were synthesized through high-pressure molding and heat treatment. The effect of the SS weight percentage on microscopic changes and magnetic characteristics was investigated. These findings indicated that a concentration of 4 wt% of SS was the most effective at enhancing magnetic characteristics. The resultant SMCs exhibited high resistivity (21.07 mΩ·cm), the lowest total loss (P10 mt/300 kHz of 44.23 W/kg), a relatively high saturation magnetization (181.8 emu/g), and permeability (35.9). Furthermore, it was observed that the permeability exhibited stabilization at lower frequencies. According to these findings, the combination of CVD and double layers could lead to the further development of SMCs in a variety of applications.","PeriodicalId":18194,"journal":{"name":"Magnetochemistry","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43644450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of Dynamic Viscoelasticity of a Mineral Oil-Based Magnetic Fluid 矿物油基磁流体的动态粘弹性研究

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-05-29 DOI: 10.3390/magnetochemistry9060143

Zhanxian Li, Yifei Guo, Hujun Wang, Chengyao Deng, Jiahao Dong, Zhongru Song, Zhenkun Li

{"title":"Study of Dynamic Viscoelasticity of a Mineral Oil-Based Magnetic Fluid","authors":"Zhanxian Li, Yifei Guo, Hujun Wang, Chengyao Deng, Jiahao Dong, Zhongru Song, Zhenkun Li","doi":"10.3390/magnetochemistry9060143","DOIUrl":"https://doi.org/10.3390/magnetochemistry9060143","url":null,"abstract":"Magnetic fluid is a field-responsive intelligent fluid, which has the flow characteristics of liquid and the elastic properties of solid. Because of its unique properties, it has a strong application prospect in the fields of magnetic soft robot, intelligent sensor, and so on. Dynamic viscoelasticity is a significant index to investigate the performance of magnetic fluid in the application process. In this paper, the dynamic viscoelasticity of a homemade mineral oil-based magnetic fluid was investigated under oscillatory shear experimental conditions using an MCR302 rheometer, and the effects of different temperatures and magnetic fields on the dynamic viscoelasticity were examined. Amplitude sweeps tests showed that the value of the storage modulus remained constant within the linear viscoelastic region (LVE) and the stable structure was not destroyed. As the magnetic field strength increased or the temperature increased, the range of the linear viscoelastic zone decreased. At large amplitude, the loss modulus will first appear as a peak and then decrease. The frequency sweep experiment showed that the storage modulus and loss modulus increased with the increase in angular frequency, and the greater the magnetic field intensity, the longer the internal structure relaxation time. When the magnetic field was constant, the higher the temperature, the smaller the storage modulus and loss modulus of the magnetic fluid. At high temperature, the loss coefficient of mesmeric fluid was large, and the magnetic fluid was more viscous. The lower the temperature is, the smaller the loss coefficient of the magnetic fluid is, and the magnetic fluid is more pliant. The study of dynamic viscoelasticity of magnetic fluids lays the foundation for establishing the complete structure intrinsic relationship of magnetic fluids and provides guidance for the application of magnetic fluids in magnetic 3D printing, droplet robot, and smart wear.","PeriodicalId":18194,"journal":{"name":"Magnetochemistry","volume":"1 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69616733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Magnetoelectric Coupling Effects in Tb-Doped BiFeO3 Nanoparticles 铽掺杂BiFeO3纳米粒子的磁电耦合效应

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-05-26 DOI: 10.3390/magnetochemistry9060142

I. Apostolova, A. Apostolov, J. Wesselinowa

引用次数: 0

Hydrothermal Synthesis and Magnetic Properties of Zn/Mn Oxides Nano Particles Zn/Mn氧化物纳米粒子的水热合成及其磁性

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-05-25 DOI: 10.3390/magnetochemistry9060139

I. Kuryliszyn-Kudelska, W. Dobrowolski, M. Arciszewska, B. Hadžić, N. Romčević, M. Romčević, D. Sibera, U. Narkiewicz

引用次数: 0

Controlling the Magnetic Properties of La0.9A0.1Mn0.9Cr0.1O3 (A: Li, K, Na) Powders and Ceramics by Alkali Ions Doping 碱离子掺杂对La0.9A0.1Mn0.9Cr0.1O3（A:Li，K，Na）粉末和陶瓷磁性能的控制

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-05-25 DOI: 10.3390/magnetochemistry9060140

P. Głuchowski, R. Nikonkov, D. Kujawa, W. Stręk, T. Murauskas, A. Pakalniškis, A. Kareiva, Andrii Yaremkevych, O. Fesenko, Aliaksandr Zhaludkevich, D. Karpinsky

{"title":"Controlling the Magnetic Properties of La0.9A0.1Mn0.9Cr0.1O3 (A: Li, K, Na) Powders and Ceramics by Alkali Ions Doping","authors":"P. Głuchowski, R. Nikonkov, D. Kujawa, W. Stręk, T. Murauskas, A. Pakalniškis, A. Kareiva, Andrii Yaremkevych, O. Fesenko, Aliaksandr Zhaludkevich, D. Karpinsky","doi":"10.3390/magnetochemistry9060140","DOIUrl":"https://doi.org/10.3390/magnetochemistry9060140","url":null,"abstract":"Nanocrystalline La0.9A0.1Mn0.9Cr0.1O3 (A: Li, K, Na) powders have been synthesized by combustion method. The powders were used to prepare ceramics by high-pressure low-temperature sintering technique. For all samples the structure, elemental composition and morphology were studied using X-ray diffraction (XRD), Raman spectroscopy, Energy-Dispersive X-ray Spectroscopy (EDS) and Scanning electron microscopy (SEM). Magnetic properties were studied using magnetometry methods and the valency changes of the cations after alkali ions doping were studied using X-ray photoelectron spectroscopy (XPS). The influence of the sintering pressure on the structural and magnetic properties of the manganites doped with different alkali ions and chromium was also investigated. Magnetization properties were studied as a function of sintering pressure and type of the dopant. Chemical doping with alkali ions as well as external pressure significantly changed the magnetic properties of the compounds. It was found that the magnetic properties of the manganites could be predictably modified through the use of a suitable dopant element.","PeriodicalId":18194,"journal":{"name":"Magnetochemistry","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45338266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of Mn Doping on Local Spin Moments and Stacking Fault Energies in Co(Mn) Alloys Mn掺杂对Co(Mn)合金局部自旋矩和层错能的影响

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-05-23 DOI: 10.3390/magnetochemistry9060138

Kayla Cole-Piepke, P. Nakarmi, A. Koenig, G. Thompson, T. Mewes, C. Mewes, R. Noebe, A. Leary

引用次数: 0

On the Size of Superconducting Islands on the Density-Wave Background in Organic Metals 有机金属中密度波背景下超导岛的大小

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-05-23 DOI: 10.3390/magnetochemistry9070173

Vladislav D. Kochev, S. S. Seidov, P. Grigoriev

{"title":"On the Size of Superconducting Islands on the Density-Wave Background in Organic Metals","authors":"Vladislav D. Kochev, S. S. Seidov, P. Grigoriev","doi":"10.3390/magnetochemistry9070173","DOIUrl":"https://doi.org/10.3390/magnetochemistry9070173","url":null,"abstract":"Most high-Tc superconductors are spatially inhomogeneous. Usually, this heterogeneity originates from the interplay of various types of electronic ordering. It affects various superconducting properties, such as the transition temperature, the magnetic upper critical field, the critical current, etc. In this paper, we analyze the parameters of spatial phase segregation during the first-order transition between superconductivity (SC) and a charge- or spin-density wave state in quasi-one-dimensional metals with imperfect nesting, typical of organic superconductors. An external pressure or another driving parameter increases the transfer integrals in electron dispersion, which only slightly affects SC but violates the Fermi surface nesting and suppresses the density wave (DW). At a critical pressure Pc, the transition from a DW to SC occurs. We estimate the characteristic size of superconducting islands during this phase transition in organic metals in two ways. Using the Ginzburg–Landau expansion, we analytically obtain a lower bound for the size of SC domains. To estimate a more specific interval of the possible size of the superconducting islands in (TMTSF)2PF6 samples, we perform numerical calculations of the percolation probability via SC domains and compare the results with experimental resistivity data. This helps to develop a consistent microscopic description of SC spatial heterogeneity in various organic superconductors.","PeriodicalId":18194,"journal":{"name":"Magnetochemistry","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43033378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Magnetic Dilution as a Direct Method for Detecting and Evaluation of Exchange Interactions between Rare Earth Elements in Oxide Systems 磁稀释作为一种直接检测和评价氧化体系中稀土元素交换相互作用的方法

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-05-20 DOI: 10.3390/magnetochemistry9050137

N. Chezhina, A. Fedorova

引用次数: 0

Magnetic Adsorbent Based on Faujasite Zeolite Decorated with Magnesium Ferrite Nanoparticles for Metal Ion Removal 铁酸镁纳米粒子修饰Faujasite沸石的磁性吸附剂去除金属离子

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-05-20 DOI: 10.3390/magnetochemistry9050136

M. R. Meirelles, J. Malafatti, M. Escote, A. H. Pinto, E. Paris

引用次数: 2