Magnetochemistry最新文献_第6页

Electrospun PCL/PVA Coaxial Nanofibers with Embedded Titanium Dioxide and Magnetic Nanoparticles for Stabilization and Controlled Release of Dithranol for Therapy of Psoriasis 电纺PCL/PVA同轴纳米纤维与嵌入的二氧化钛和磁性纳米颗粒用于稳定和控制释放二氢大麻酚治疗银屑病

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-07-19 DOI: 10.3390/magnetochemistry9070187

Natália Andrýsková, P. Sourivong, M. Babincová, P. Babinec, M. Šimaljaková

{"title":"Electrospun PCL/PVA Coaxial Nanofibers with Embedded Titanium Dioxide and Magnetic Nanoparticles for Stabilization and Controlled Release of Dithranol for Therapy of Psoriasis","authors":"Natália Andrýsková, P. Sourivong, M. Babincová, P. Babinec, M. Šimaljaková","doi":"10.3390/magnetochemistry9070187","DOIUrl":"https://doi.org/10.3390/magnetochemistry9070187","url":null,"abstract":"Dithranol is one of the oldest and most efficient drugs used in the treatment of psoriasis. One of the challenges with using dithranol is its photostability, because it easily degrades when exposed to light. This study investigated the potential of coaxial core-sheath PCL/PVA nanofibers as a dual-functional system for enhancing dithranol photostability and remote-controlled drug delivery for psoriasis therapy. We have shown that coaxial nanofibers with titanium oxide nanoparticles (reflecting and absorbing ultra-violet light) in the PVA-based sheath part of the nanofibers can increase dithranol photostability. Incorporation of dithranol and magnetic nanoparticles into a PCL-based core of the nanofibers enables dithranol release control via an external radio-frequency field. The application of a radio-frequency field generates heat that can be used to control the release rate of drugs. Our approach therefore offers a non-invasive and remotely controlled drug release system that hold promise for the development of new topical formulations for psoriasis treatment using dithranol.","PeriodicalId":18194,"journal":{"name":"Magnetochemistry","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41672188","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

Femtosecond Laser Ablation-Induced Magnetic Phase Transformations in FeRh Thin Films FeRh薄膜中飞秒激光烧蚀诱导的磁相变

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-07-18 DOI: 10.3390/magnetochemistry9070186

P. Varlamov, A. Semisalova, Anh Dung Nguyen, M. Farle, Y. Laplace, M. Raynaud, O. Noel, P. Vavassori, V. Temnov

{"title":"Femtosecond Laser Ablation-Induced Magnetic Phase Transformations in FeRh Thin Films","authors":"P. Varlamov, A. Semisalova, Anh Dung Nguyen, M. Farle, Y. Laplace, M. Raynaud, O. Noel, P. Vavassori, V. Temnov","doi":"10.3390/magnetochemistry9070186","DOIUrl":"https://doi.org/10.3390/magnetochemistry9070186","url":null,"abstract":"In this study, we present a novel investigation into the magnetic and morphological properties of equiatomic B2-ordered FeRh thin films irradiated with single high-intensity ultrashort laser pulses. The goal is to elucidate the effect of femtosecond laser ablation on the magnetic properties of FeRh. We employed Scanning Magneto-Optical Kerr Effect (S-MOKE) microscopy to examine the magnetic phase after laser processing, providing high spatial resolution and sensitivity. Our results for the first time demonstrated the appearance of a magneto-optical signal from the bottom of ablation craters, suggesting a transition from antiferromagnetic to ferromagnetic behavior. Fluence-resolved measurements clearly demonstrate that the ablation threshold coincides with the threshold of the antiferromagnet-to-ferromagnet phase transition. The existence of such a magnetic phase transition was independently confirmed by temperature-dependent S-MOKE measurements using a CW laser as a localized heat source. Whereas the initial FeRh film displayed a reversible antiferromagnet-ferromagnet phase transition, the laser-ablated structures exhibited irreversible changes in their magnetic properties. This comprehensive analysis revealed the strong correlation between the femtosecond laser ablation process and the magnetic phase transformation in FeRh thin films.","PeriodicalId":18194,"journal":{"name":"Magnetochemistry","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44066209","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

Effect of Electron Correlations on the Electronic Structure and Magnetic Properties of the Full Heusler Alloy Mn2NiAl 电子关联对全Heusler合金Mn2NiAl电子结构和磁性能的影响

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-07-17 DOI: 10.3390/magnetochemistry9070185

Evgeniy D. Chernov, A. Lukoyanov

{"title":"Effect of Electron Correlations on the Electronic Structure and Magnetic Properties of the Full Heusler Alloy Mn2NiAl","authors":"Evgeniy D. Chernov, A. Lukoyanov","doi":"10.3390/magnetochemistry9070185","DOIUrl":"https://doi.org/10.3390/magnetochemistry9070185","url":null,"abstract":"In this theoretical study, we investigate the effect of electron correlations on the electronic structure and magnetic properties of the full Heusler alloy Mn2NiAl in the framework of first-principles calculations. We investigate the electron correlation effect as employed within hybrid functional (HSE) and also within the DFT+U method with varied values of parameters between 0.9 and 6 eV. The XA-crystal structure was investigated with antiferromagnetic orderings of the magnetic moments of the manganese. It was found that with a growth of the Coulomb interaction parameter, the manganese ions magnetic moment increases, and it reaches the value of 4.15–4.46 μB per Mn. In addition, the total magnetic moment decreases because of the AFM ordering of the Mn ions and a small magnetic moment of Ni. The calculated total magnetic value agrees well with recent experiments demonstrating a low value of magnetization. This experimental value is most closely reproduced for the moderate values of the Coulomb parameter, also calculated in constrained LDA, while previous DFT studies substantially overestimated this value. It is also worth noticing that for all values of the Coulomb interaction parameter, this compound remains metallic in its electronic structure in agreement with transport measurements.","PeriodicalId":18194,"journal":{"name":"Magnetochemistry","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49320197","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

Towards Resonantly Enhanced Acoustic Phonon-Exchange Magnon Interactions at THz Frequencies 太赫兹频率下共振增强声子交换磁振子相互作用的研究

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-07-17 DOI: 10.3390/magnetochemistry9070184

Tudor-Gabriel Mocioi, Antonia Ghita, V. Temnov

{"title":"Towards Resonantly Enhanced Acoustic Phonon-Exchange Magnon Interactions at THz Frequencies","authors":"Tudor-Gabriel Mocioi, Antonia Ghita, V. Temnov","doi":"10.3390/magnetochemistry9070184","DOIUrl":"https://doi.org/10.3390/magnetochemistry9070184","url":null,"abstract":"Using valid experimental parameters, we quantify the magnitude of resonantly phonon-driven precession of exchange magnons in freestanding ferromagnetic nickel thin films on their thickness L. Analytical solutions of acoustically driven equations for magnon oscillators display a nonmonotonous dependence of the peak magnetization precession on the film thickness. It is explained by different L-dependence of multiple prefactors entering in the expression for the total magnetization dynamics. Depending on the ratio of acoustic and magnetic (Gilbert) damping constants, the magnetization precession is shown to be amplified by a Q-factor of either the phonon or the magnon resonance. The increase in the phonon mode amplitude for thinner membranes is also found to be significant. Focusing on the magnetization dynamics excited by the two first acoustic eigenmodes with p=1 and p=2, we predict the optimum thicknesses of nickel membranes to achieve large amplitude magnetization precession at multi 100 GHz frequencies at reasonably low values of an external magnetic field. By extending the study to the case of Ni-Si bilayers, we show that these resonances are achievable at even higher frequencies, approaching the THz range.","PeriodicalId":18194,"journal":{"name":"Magnetochemistry","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46225585","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

Electrically Detected Magnetic Resonance on a Chip (EDMRoC) for Analysis of Thin-Film Silicon Photovoltaics 用于分析薄膜硅光伏的电检测芯片磁共振（EDMRoC）

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-07-15 DOI: 10.3390/magnetochemistry9070183

M. Segantini, Gianluca Marcozzi, D. Djekic, Anh Chu, D. Amkreutz, C. T. Trinh, Sebastian Neubert, B. Stannowski, K. Jacob, I. Rudolph, Joseph E. McPeak, J. Anders, B. Naydenov, K. Lips

{"title":"Electrically Detected Magnetic Resonance on a Chip (EDMRoC) for Analysis of Thin-Film Silicon Photovoltaics","authors":"M. Segantini, Gianluca Marcozzi, D. Djekic, Anh Chu, D. Amkreutz, C. T. Trinh, Sebastian Neubert, B. Stannowski, K. Jacob, I. Rudolph, Joseph E. McPeak, J. Anders, B. Naydenov, K. Lips","doi":"10.3390/magnetochemistry9070183","DOIUrl":"https://doi.org/10.3390/magnetochemistry9070183","url":null,"abstract":"Electrically detected magnetic resonance (EDMR) is a spectroscopic technique that provides information about the physical properties of materials through the detection of variations in conductivity induced by spin-dependent processes. EDMR has been widely applied to investigate thin-film semiconductor materials in which the presence of defects can induce the current limiting processes. Conventional EDMR measurements are performed on samples with a special geometry that allows the use of a typical electron paramagnetic resonance (EPR) resonator. For such measurements, it is of utmost importance that the geometry of the sample under assessment does not influence the results of the experiment. Here, we present a single-board EPR spectrometer using a chip-integrated, voltage-controlled oscillator (VCO) array as a planar microwave source, whose geometry optimally matches that of a standard EDMR sample, and which greatly facilitates electrical interfacing to the device under assessment. The probehead combined an ultrasensitive transimpedance amplifier (TIA) with a twelve-coil array, VCO-based, single-board EPR spectrometer to permit EDMR-on-a-Chip (EDMRoC) investigations. EDMRoC measurements were performed at room temperature on a thin-film hydrogenated amorphous silicon (a-Si:H) pin solar cell under dark and forward bias conditions, and the recombination current driven by the a-Si:H dangling bonds (db) was detected. These experiments serve as a proof of concept for a new generation of small and versatile spectrometers that allow in situ and operando EDMR experiments.","PeriodicalId":18194,"journal":{"name":"Magnetochemistry","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42158473","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

Synthesis and Structural and Magnetic Properties of Polycrystalline GaMo4Se8 多晶GaMo4Se8的合成、结构和磁性能

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-07-12 DOI: 10.3390/magnetochemistry9070182

José F. Malta, M. Henriques, J. A. Paixão, A. P. Gonçalves

引用次数: 0

Nonthermal Equilibrium Process of Charge Carrier Extraction in Metal/Insulator/Organic Semiconductor/Metal (MIOM) Junction 金属/绝缘体/有机半导体/金属(MIOM)结中载流子萃取的非热平衡过程

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-07-11 DOI: 10.3390/magnetochemistry9070180

Hiroyuki Tajima, Takeshi Oda, Tomofumi Kadoya

引用次数: 0

Effect of Cr3+ Doping on Magnetic Properties of Zn-Mg Ferrite Nanoparticles Cr3+掺杂对纳米Zn-Mg铁氧体磁性能的影响

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-07-11 DOI: 10.3390/magnetochemistry9070181

Xiaogang Yu, Renpeng Yang, Chengwei Wu, Boqi Liu, W. Zhang

引用次数: 0

Special Issue: Soft and Hard Magnetic Materials: Latest Advances and Prospects 特刊：软硬磁性材料：最新进展与展望

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-07-10 DOI: 10.3390/magnetochemistry9070179

C. Favieres

引用次数: 0

Characterization and Magnetic Properties of Sintered Glass-Ceramics from Dispersed Fly Ash Microspheres 分散粉煤灰微球烧结微晶玻璃的表征及磁性能

IF 2.7 4区化学

Magnetochemistry Pub Date : 2023-07-09 DOI: 10.3390/magnetochemistry9070177

E. Fomenko, G. Akimochkina, Y. Knyazev, S. V. Semenov, V. Yumashev, L. Solovyov, A. Anshits

{"title":"Characterization and Magnetic Properties of Sintered Glass-Ceramics from Dispersed Fly Ash Microspheres","authors":"E. Fomenko, G. Akimochkina, Y. Knyazev, S. V. Semenov, V. Yumashev, L. Solovyov, A. Anshits","doi":"10.3390/magnetochemistry9070177","DOIUrl":"https://doi.org/10.3390/magnetochemistry9070177","url":null,"abstract":"The recycling of hazardous industrial waste into high-tech materials with desired properties is of considerable interest since it provides optimal alternatives for its final disposal. Coal fly ash, the major waste generated by coal-fired power plants, contains significant quantities of dispersed microspheres with a diameter smaller than 10 μm, which are anthropogenic atmospheric pollutants PM10. Due to their composition and fine-grained powder morphology, they can be converted into sintered products. In this study, dispersed microspheres from class C fly ash were directly sintered without any additive to form high-strength glass-ceramics with magnetic properties. The optimum processing conditions were achieved at a temperature of 1200 °C, at which samples with a compressive strength of 100.6 MPa were obtained. Sintering reduces the quantity of the glass phase and promotes the formation of larnite, Fe-spinel, ye’elimite, and ternesite. Mössbauer measurements show that the relative concentration of the magnetic phase compared to the paramagnetic one rises almost in order. The sintered sample demonstrates a narrower distribution of the hyperfine magnetic field and a significantly lower value of the coercive field of 25 Oe, which allows proposing such materials as soft magnetic materials. The presented results demonstrate promising industrial applications of hazardous PM10 to minimize solid waste pollution.","PeriodicalId":18194,"journal":{"name":"Magnetochemistry","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43129029","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