Article
Polymer Science
Yen-Zen Wang, Yu-Wei Cheng, Lin-Chia Ho, Wen-Yao Huang, Ko-Shan Ho, Yu-Ting Syu
Summary: Oleic acid-modified Fe3O4 nanoparticles were successfully covered with polyanilines through inverse suspension polymerization, resulting in the formation of superparamagnetic ferrite and α''-Fe16N2 mixture at high temperature. The magnetic saturation of the calcined iron-composites slightly decreases after 3 months of storage, but remains relatively high.
Article
Crystallography
Marian Grigoras, Mihaela Lostun, Marieta Porcescu, George Stoian, Gabriel Ababei, Nicoleta Lupu
Summary: In this work, alpha ''-Fe16N2 powders were successfully prepared from iron lumps using the gas atomization method, followed by subsequent nitriding in an ammonia-hydrogen gas mixture stream. The particle size of the powders can be controlled by changing the preparation conditions. The prepared powders demonstrated a high saturation magnetization and showed the potential for mass production of rare-earth-free precursors for permanent magnets.
Article
Materials Science, Multidisciplinary
Jong-Hyeon Shin, Yong-Hyun Kim, Jong-Bae Park, Dae-Chul Kim, Young-Woo Kim, Jong-Sik Kim, Jung-Sik Yoon
Summary: In this study, the nitridation of silicon oxide film surfaces using an inductively coupled plasma source was investigated. The plasma parameters and nitride film characteristics were measured and analyzed under different nitrogen gas pressures and radio frequency power levels. The correlation between nitridation rate and process parameters was studied.
Article
Engineering, Environmental
Run Yuan, Yu Xia, Xu Wu, Can He, Yihe Qin, Changjun He, Xuewei Zhang, Na Li, Xuwen He
Summary: This study presents a new O-3/H2O2/Fe-shavings process for the treatment of coking wastewater secondary biochemical effluent (CWSBE). By optimizing the parameters, this process effectively removes organic pollutants, enabling the treated wastewater to meet the relevant discharge standards.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
M. Tobise, S. Saito
Summary: Metastable alpha ''-Fe16N2 is considered a good candidate as a semi-hard magnetic material, and in this study, it was found that only when M=Al and V were used as substitution elements for Fe, the desired nanoparticles could be obtained. This suggests the importance of the substitution elements in the synthesis process.
IEEE TRANSACTIONS ON MAGNETICS
(2021)
Article
Environmental Sciences
Ting-ting Zhu, Wen-xia Lai, Yao-Bin Zhang, Yi-wen Liu
Summary: The Feammox process plays a crucial role in the natural nitrogen cycle, but has been rarely investigated in the field of wastewater treatment. This study explored the potential of anaerobic ammonium removal coupled with organics to assess the Feammox process for conventional wastewater treatment. Results showed that the Fe2O3 group had the highest efficiency in ammonium removal, while organics significantly inhibited the Feammox process.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Electrical & Electronic
M. Tobise, S. Saito
Summary: The metastable alpha ''-Fe16N2 is a candidate for rare earth-free semi-hard magnetic materials, but the magnetocrystalline anisotropy needs to be improved. Substitution of Fe with elements such as Co, Ni, Mn, and Al has been studied to enhance the magnetocrystalline anisotropy through theoretical calculations and thin-film experiments.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Nanoscience & Nanotechnology
K. Oka, T. Ogawa, H. Yamamoto, C. Sakaguchi, R. Gallage, N. Kobayashi, M. Azuma
Summary: The demand for a high-performance magnet made of abundant elements without rare earth is increasing. Alpha-Fe16N2 shows promising potential as a superior permanent magnet material compared to ferrite and Al-Ni-Co magnets. By applying high-pressure and high-temperature treatment, we successfully achieved dense alpha-Fe16N2 pellets. These pelletized samples maintained their magnetic properties for 100 days due to the suppression of gradual decomposition in the air.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Byeong Jun Cha, Ji Yoon Choi, Soong Yeon Kim, Young Dok Kim
Summary: The combination of a pre-filter and a conventional catalytic converter is effective in reducing cold-start emissions. Using CVD to load catalytically active Fe species on H-ZSM-5 zeolite enhances the oxidation activity of acetaldehyde, ultimately improving the catalytic conversion efficiency of exhaust purification systems.
APPLIED SURFACE SCIENCE
(2022)
Review
Environmental Sciences
Jingjing Wang, Shijie Yuan, Xiaohu Dai, Bin Dong
Summary: An increasing number of novel organic contaminants pose challenges for water treatment technology. Advanced oxidation processes based on ozone offer advantages in treating refractory organic contaminants. Biochar has gained attention in wastewater treatment due to its porous structure, portable preparation, and stability. Iron species are commonly used in catalytic ozonation due to their magnetic polarization, abundance, and low cost. However, there is a lack of comprehensive research on Fe-loaded biochar in heterogeneous catalytic ozonation. This review aims to introduce the progress and explore mechanisms and detection techniques for Fe-based catalysts and Fe-loaded biochar in catalytic ozonation.
Article
Materials Science, Multidisciplinary
Bing-Jyh Lu, Keng-Ta Lin, Yi-Ming Kuo, Cheng-Hsien Tsai
Summary: By adding SiO2 nanoparticles and performing rapid microwave plasma-nitridation, high transmittance, high hardness, high adhesion, self-cleaning, anti-fogging, superhydrophilicity, visible photo-induced photocatalysis, and great mechanical stability were simultaneously achieved for TiO2 film.
Article
Materials Science, Multidisciplinary
M. N. Mathabathe, A. S. Bolokang, G. Govender, C. W. Siyasiya, R. J. Mostert
Summary: The thermal, surface properties and microstructures of the nitrided gamma-Ti-46Al-2Nb and Ti-46Al-2Nb-0.7Cr-0.3Si intermetallic alloys were investigated. Thin nitride layers formed on both alloys after annealing and nitridation under nitrogen gas, exhibiting surface spallation at different rates during cyclic oxidation. XPS analysis revealed the presence of mixed oxide layer near the Ti-46Al-2Nb-0.7Cr-0.3Si surface.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Sunjae Kim, Minje Kim, Jihyun Kim, Wan Sik Hwang
Summary: The electrical and optoelectronic performance of semiconductor devices are significantly influenced by defects or crystal imperfections in the semiconductor. Oxygen vacancies are commonly found defects in metal oxide semiconductors, such as beta-Ga2O3, and act as electron trap sites below the conduction band edge. This study discusses the effects of plasma nitridation on polycrystalline beta-Ga2O3 thin films, showing that it effectively reduces the electron trap sites and improves the device performance for both electronics and optoelectronics.
Article
Chemistry, Physical
Adrian Radon, Mariola Kadziolka-Gawel, Dariusz Lukowiec, Piotr Gebara, Katarzyna Cesarz-Andraczke, Aleksandra Kolano-Burian, Patryk Wlodarczyk, Marcin Polak, Rafal Babilas
Summary: The article discusses the effects of organic modifiers on the shape and formation of oxidized layer composed of maghemite, highlighting the synthesis of cuboidal magnetite nanoparticles in the presence of triphenylphosphine which exhibit unique magnetic and electrical properties. It is found that nanoparticles with disordered and oxidized surface have increased electrical conductivity and improved electric energy storage potential.
Article
Materials Science, Coatings & Films
Yang Zhao, Yuebo Li, Tengfei Yin, Tao Zhang, Fuhui Wang
Summary: The post-treatment processes of plasma electrolytic oxidation (PEO) coatings were investigated for their corrosion behaviors and adhesion strength. The results showed that when the PEO coating was treated with high-temperature oxidation (HTO) and mix of silane coupling agent (SCA) and benzotriazole (BTA), it exhibited optimal corrosion behaviors and adhesion strength. The HTO treatment at 150 degrees Celsius showed superior long-term performance.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Chemistry, Physical
Tomoyuki Hirano, Takama Tsuboi, Eishi Tanabe, Takashi Ogi
Summary: Metal oxide supports have attracted attention in improving the performance of fuel cells. In this study, niobium-doped tin oxide nanoparticles were synthesized with a network structure and platinum catalysts were deposited on them. The study evaluated the effect of different particle formation processes on the structure of the flame-made Pt/NTO particles. The flame spray pyrolysis method was found to produce NTO with uniformly dispersed Pt, and the resulting particles showed high electrochemical surface area and mass activity values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Yasuhiko Kitamoto, Kiet Le Anh Cao, Phong Hoai Le, Oktaviardi Bityasmawan Abdillah, Ferry Iskandar, Takashi Ogi
Summary: This study presents a green synthesis strategy to design biomass-derived porous carbon electrode materials with precisely tailored structure and morphology using Kraft lignin as the carbon precursor and NaOH as an alternative activation agent. The obtained porous carbon spheres exhibit controlled hollow structure and tunable surface properties by adjusting the NaOH concentration. These carbon spheres show higher specific capacitance values compared to commercial activated carbon, indicating their potential for energy storage devices.
Article
Materials Science, Multidisciplinary
Annie M. Rahmatika, Youhei Toyoda, Tue Tri Nguyen, Kiet Le Anh Cao, Tomoyuki Hirano, Takeo Kitamura, Yohsuke Goi, Yuko Morita, Takashi Ogi
Summary: In this study, nanostructured 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO)-oxidized cellulose nanofiber (TOCN) particles were successfully prepared via a spray-drying process without changing their chemical functionalization. The particles exhibited a high zeta-potential value and porous structure formation through solvent polarity control, leading to good adsorption capacity.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Chemistry, Physical
Tue Tri Nguyen, Youhei Toyoda, Nur Syakirah Nabilah Saipul Bahri, Annie M. Rahmatika, Kiet Le Anh Cao, Tomoyuki Hirano, Katsuo Takahashi, Yohsuke Goi, Yuko Morita, Mai Watanabe, Takashi Ogi
Summary: In this study, Carbodilite was used as a cross-linker to improve the water resistance of TOCN particles. The presence of polycarbodiimide significantly increased the water resistance of cross-linked TOCN particles.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Tomoyuki Hirano, Takama Tsuboi, Kiet Le Anh Cao, Eishi Tanabe, Takashi Ogi
Summary: Niobium-doped tin oxide (NTO) nanoparticles were prepared by spray flames, which exhibited high specific surface area and good performance as catalyst support in fuel cells. The characteristics and performances of the NTO nanoparticles were evaluated, revealing their potential for fuel cell applications.
JOURNAL OF NANOPARTICLE RESEARCH
(2023)
Article
Chemistry, Physical
Fitri Aulia Permatasari, Reza Umami, Citra Deliana Dewi Sundari, Tirta Rona Mayangsari, Atthar Luqman Ivansyah, Fahdzi Muttaqien, Takashi Ogi, Ferry Iskandar
Summary: Through integrated experimental and computational studies, the influence of pyrrolic-N concentration and position on the absorption of pyrrolic-N-rich carbon dots was comprehensively elucidated. It was found that a mid-site pyrrolic-N is generated after the pyrrolic-N concentration exceeds 10%, while edge-site pyrrolic-N induces a frontier orbital hybridization, reducing bandgap energy. This study sheds light on the design and optimization of pyrrolic-N-rich carbon dots for the first near infrared window responsive materials in biomedical applications.
Article
Chemistry, Multidisciplinary
Phong Hoai Le, Kiet Le Anh Cao, Yasuhiko Kitamoto, Tomoyuki Hirano, Takashi Ogi
Summary: By studying the formation and framework thickness of macroporous three-way catalyst (TWC) particles synthesized using the template-assisted aerosol process, it was found that the template concentration played a crucial role in maintaining the macroporous structure and controlling the framework thickness between the macropores. The increase in template concentration can reduce the framework thickness of the nanoporous material and improve the mass transfer coefficient.
Article
Chemistry, Physical
Thi Thanh Nguyen Ho, Tomoyuki Hirano, Ryosuke Narui, Hiroshi Tsutsumi, Miho Kishi, Yusuke Yoshikawa, Kiet Le Anh Cao, Takashi Ogi
Summary: The flame aerosol process was used to synthesize a chain-like structure catalyst support comprising low-loading iridium-iridium oxide species (Ir-IrO2/TiO2). The Ir-IrO2/TiO2 particles containing 10 wt % IrO2 showed much lower volume resistivity than TiO2 particles, indicating improved conductivity. The membrane electrode assembly (MEA) based on the developed Ir-IrO2/TiO2 catalyst support exhibited remarkable stability after 20 min testing at a voltage of 1.7 V.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Tue Tri Nguyen, Nur Syakirah Nabilah Saipul Bahri, Annie M. Rahmatika, Kiet Le Anh Cao, Tomoyuki Hirano, Takashi Ogi
Summary: Porous pectin particles have been synthesized as drug carriers using indomethacin as a model drug, with improved specific surface areas compared to nonporous particles. The porous structure shortens the diffusion path and improves the release rate of drug molecules, resulting in a three times faster drug release rate compared to nonporous particles.
ACS APPLIED BIO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Delyana Ratnasari, Eka Lutfi Septiani, Kiet Le Anh Cao, Tomoyuki Hirano, Nobuhiro Okuda, Hiroyuki Matsumoto, Takashi Ogi
Summary: Submicron-sized FeNi@SiO2 particles with precisely controllable shell thickness were successfully synthesized in this study using a swirler connector-assisted spray pyrolysis system. The thickness of the SiO2 shell can be tuned by adjusting the parameter conditions, and the fabrication method consistently yielded a high coating ratio of more than 94%. The study also investigated the particle formation process and emphasized the importance of controlling the preheater and SiO2 supplied amount.
Article
Nanoscience & Nanotechnology
Phong Hoai Le, Shunki Yamashita, Kiet Le Anh Cao, Tomoyuki Hirano, Nao Tsunoji, Duhaul Biqal Kautsar, Takashi Ogi
Summary: This study focused on developing TWC particles with a hierarchically ordered macroporous structure using a template-assisted spray method. The synthesized catalyst particles exhibited better catalytic performance due to the enhanced mass transfer efficiency induced by the macropores.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Muhammad Alief Irham, Oktaviardi Bityasmawan Abdillah, Darul Roni Rodiansyah, Fakhrian Hanif Tejo Baskoro, Haerul Fahmi, Takashi Ogi, Ferry Iskandar
Summary: In this study, a high-performance FeS2 supercapacitor was synthesized by incorporating polyvinylpyrrolidone (PVP) to solve the limitations of FeS2. PVP prevented dendritic expansion and acted as a binding material, while facilitating a one-step synthesis process. The FeS2/PVP nanocomposite exhibited superior electrochemical properties with high specific capacity and energy density.
DALTON TRANSACTIONS
(2023)
Review
Engineering, Chemical
Kiet Le Anh Cao, Ferry Iskandar, Eishi Tanabe, Takashi Ogi
Summary: The development of energy storage devices is crucial for the utilization of sustainable energy sources in the future. Novel carbon-based materials, such as nanostructured carbon spheres, have gained significant attention for their potential applications as high-performance electrode materials in rechargeable batteries and supercapacitors. This comprehensive review summarizes recent advances in the synthesis and applications of nanostructured carbon spheres, highlighting the challenges and future research directions in controlling their structure and properties for practical applications.
KONA POWDER AND PARTICLE JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Phong Hoai Le, Yasuhiko Kitamoto, Shunki Yamashita, Kiet Le Anh Cao, Tomoyuki Hirano, Tareq W. M. Amen, Nao Tsunoji, Takashi Ogi
Summary: In recent years, transportation-related air pollution has become a global concern. This study focused on the development of a three-way catalyst (TWC) technology to reduce harmful emissions. The researchers synthesized macroporous TWC particles with different macropore sizes and found that the size of the macropores significantly affected the catalytic performance of the TWC structures. The study proposed a plausible mechanism to explain the influence of macropore size on the diffusion efficiency within the structures.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Chemical
Nur Syakirah Nabilah Saipul Bahri, Tue Tri Nguyen, Tomoyuki Hirano, Kouhei Matsumoto, Mai Watanabe, Yuko Morita, Takashi Ogi
Summary: This study explores the use of oxazoline-containing polymers as cross-linking agents to improve the water stability of TOCN particles while preserving their particle shape. The results demonstrate that the oxazoline-cross-linked TOCN particles have good stability in water and can be used in practical applications.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Bibhutibhusan Nayak, S. Narayana Jammalamadaka
Summary: This article presents a method for remote detection of bovine serum albumin (BSA) using modified cantilever beam magnetometry (CBM). By combining a magnetostrictive Fe70Ga30 cantilever with optical detection technique, researchers were able to detect high concentrations of BSA remotely. The results of this study demonstrate the potential of this method in estimating the magnetostriction of thin films.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Yu Hao, R. E. Camley, Z. Celinski
Summary: Magnetic particles have various applications and their magnetic state is determined by their size and the strength of an applied magnetic field. Numerical simulations were performed to study the effect of an applied field on the critical size of single-domain magnetic particles, and the critical field at which a particle becomes single-domain was determined.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Nitesh Singh, Naresh Kumar, Dharohar Sahadot, Anil Annadi, Vidyadhar Singh, Murtaza Bohra
Summary: The unique magnetic properties of FM/AFM and hard-FM/soft-FM nanocomposite thin films have significant relevance for numerous applications. The composition and performance of different magnetic phases in the nanocomposite films can be significantly affected by the laser ablation conditions and annealing temperature.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Alya Ali Musaed, Samir Salem Al-Bawri, Khaled Aljaloud, Wazie M. Abdulkawi, Mohammad Tariqul Islam, Mandeep Jit Singh, Zaini Sakawi, Husam Hamid Ibrahim
Summary: This research presents a wideband tunable metamaterial for body-centric applications in the millimeter-wave frequency band. The proposed metamaterial has a wide operating frequency range and enhanced gain, making it suitable for improving the antenna performance in 5G wireless communication systems.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Binod K. Rai, Boris Maiorov, Krzysztof Gofryk, Patrick O'Rourke, Catherine Housley, Henry Ajo, Asraf Sawon, Arjun K. Pathak, Narayan Poudel, Qiang Zhang, Travis J. Williams, Matthias Frontzek
Summary: This manuscript reports on the structural and magnetic properties of NdCuGa3. The study confirmed the crystal structure and magnetic phase transition of NdCuGa3 using XRD, neutron diffraction, magnetization, and specific heat measurements. The neutron diffraction data further confirmed the antiferromagnetic phase of NdCuGa3.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Haonan Li, Cong Li, Hailiang Huang, Guodong Hao, Fei Wang
Summary: The electronic structure and ferroelectric-ferromagnetic coupling properties of Y-doped and vacancy-containing GaN-ZnO heterojunctions are systematically investigated. The magnetism in vacancy-containing systems is generated by the spin polarization of unpaired electrons induced by cationic vacancies, while in Y-doped systems, bound magnetic polarons are formed by the orbital hybridization of s-state and d-state electrons of Y-doped elements.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Muhammad Ijaz, Hafeez Ullah, Bandar Ali Al-Asbahi, Mati Ullah Khan, Zaheer Abbas, Sana Ullah Asif
Summary: M-type BaFe11.4-xAlxCo0.6O19 hexaferrites with Al3+ substitutions were synthesized using the co-precipitation method followed by Sonochemical process. The synthesized materials were characterized using XRD, FTIR, UV-vis spectroscopy, VSM, SEM, and LCR meter. The results showed that aluminum doping decreased the band gap and enhanced the magnetic and dielectric properties of the hexaferrites, making them suitable for various applications.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Oleg I. Utesov
Summary: The elementary excitations spectrum of anisotropic frustrated antiferromagnets in the fan phase is discussed. It is found that the low-energy part of the spectrum consists of a gapless phason branch with linear dispersion and a gapped optical branch corresponding to the fan structure amplitude oscillations. In the high-energy part of the spectrum, the excitations are similar to the magnons of the fully polarized phase.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Alexander Ya. Simonovskii, Alexander A. Yanovskii, Arthur R. Zakinyan
Summary: In this study, the departure frequency of vapor bubbles during boiling of ferrofluid in a horizontal magnetic field is experimentally investigated. Two methods, visual and inductive, are used to measure the frequency of bubble departure. The results show that the bubble departure frequency can decrease with increasing magnetic field strength and increase with increasing temperature of the heat-emitting surface. A linear stability analysis is conducted to analyze the influence of the magnetic field on the frequency of bubble formation during ferrofluid boiling.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Oleg Heczko, Michal Rames, Vit Kopecky, Petr Vertat, Michal Varga, Ladislav Straka
Summary: Heusler Ni-Mn-Ga alloys are multiferroic materials that exhibit magnetic shape memory (MSM) phenomena. By doping transition elements into Ni2MnGa alloys, the transformation temperatures can be modified and complex behaviors can be observed, such as the variation in saturation magnetization and the effects of elemental substitution on compound properties.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Carlos Ariel Samudio Perez, Ariel Flaig de Marchi
Summary: This study investigates the electronic and magnetic properties of the Full-Heusler Fe2MnAs alloy using first-principles calculations. The alloy may form spontaneously and exhibits a ferromagnetic order and high spin-polarization. It can be transformed into a half-metal by contracting the lattice constant. Additionally, certain defects contribute to the spin-polarization of the alloy, making it a fully half-metallic material.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Satish Geeri, Aditya Kolakoti, Prasadarao Bobbili
Summary: In this study, an electromagnetic wave-absorbing material was fabricated using a polymer composite material with fiber orientation and Multiwall Carbon Nanotubes as filler materials, along with a Perfect Electric Conducting material. The experiments demonstrated strong electromagnetic absorbing properties for the composites with PEC-coated and non-PEC-coated materials. Mechanical, thermal, and morphological analysis confirmed the similar trend in properties. CRITIC analysis helped identify the sequence order of sustaining properties for the fabricated composites.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Yankai Chen, Ruoxue Zhang, Yukai An
Summary: The piezoelectricity, valley character, and magnetic properties of 2H-VS2 monolayer were studied, revealing its potential applications in spintronics and valleytronics due to its bipolar magnetic semiconductor characteristics and superior physical properties.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Leonardo S. Lima
Summary: This study investigates the thermodynamic quantities, such as entropy, specific heat, and magnetic susceptibility, in the next-nearest-neighbors Heisenberg model on a honeycomb-kagome lattice. The linear spin-wave approach is applied to obtain the temperature-dependent behavior of these quantities. Additionally, the entanglement negativity, a quantifier of quantum entanglement, and the spin Hall conductivity are also studied. The results show that all the thermodynamic quantities, as well as the entanglement negativity and spin Hall conductivity, exhibit an increasing trend with temperature. Furthermore, it is found that all the analyzed quantities approach zero in the low-temperature limit, consistent with experimental observations.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Zhaoxing Wang, Maximilian Kai Reimann, Wang Chen, Yikun Zhang, Rainer Poettgen
Summary: The Mo2FeB2-type compounds RE2Ga2Mg (RE = Tm, Er, Ho) exhibit a large magnetocaloric effect, making them promising for cryogenic magnetic cooling applications.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
