Article
Nanoscience & Nanotechnology
Oguz Yildirim, Riccardo Tomasello, Yaoxuan Feng, Giovanni Carlotti, Silvia Tacchi, Pegah Mirzadeh Vaghefi, Anna Giordano, Tanmay Dutta, Giovanni Finocchio, Hans J. Hug, Andrada-Oana Mandru
Summary: The development of skyrmionic devices requires tuning material parameters to stabilize and control the density of skyrmions. Recent research has shown that different types of skyrmions can be simultaneously stabilized at room temperature in heterostructures containing ferromagnets, ferrimagnets, and heavy metals, offering a new platform for encoding binary information using skyrmion types instead of their presence or absence. By adjusting the geometric and material parameters of individual layers, the energy landscape of the two skyrmion types in such heterostructures can be finely tuned.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Mohamed Salaheldeen, Ayman Nafady, Ahmed M. Abu-Dief, Rosario Diaz Crespo, Maria Paz Fernandez-Garcia, Juan Pedro Andres, Ricardo Lopez Anton, Jesus A. Blanco, Pablo Alvarez-Alonso
Summary: The interest in magnetic nanostructures with perpendicular magnetic anisotropy and exchange bias has grown due to their potential applications in spintronic devices. In this study, a nanofabrication process was used to induce a significant out-of-plane component of the magnetic easy axis and exchange bias in CoO/Co multilayers deposited on nanostructured alumina templates. The increase in exchange bias and coercivity in the nanostructured films compared to non-patterned films indicates a change in magnetic anisotropy from in-plane to out-of-plane.
Article
Materials Science, Multidisciplinary
Michal Krupinski, Pawel Sobieszczyk
Summary: This study investigates the magnetic reversal and domain pattern formation in antidot arrays with perpendicular magnetic anisotropy. The rotation of antidots around their centers leads to significant differences in coercivity values and domain sizes, impacting the magnetic behavior of systems with square and cross-shaped antidots.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Physics, Applied
Wenchang Li, Xinxing Xu, Tenghua Gao, Takashi Harumoto, Yoshio Nakamura, Ji Shi
Summary: In this study, Mn4N films with high crystallinity and perpendicular magnetic anisotropy (PMA) were successfully prepared on a glass substrate using Mn3N2 as the seed layer by reactive magnetron sputtering. It was found that the thickness of the seed layer plays a crucial role in the growth of Mn4N, and an appropriate seed layer thickness can promote the crystalline growth of Mn4N and prevent oxidation by providing additional nitrogen atoms.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Tatsuya Yamamoto, Takayuki Nozaki, Kay Yakushiji, Shingo Tamaru, Hitoshi Kubota, Akio Fukushima, Shinji Yuasa
Summary: The study shows that Ta layer in MgO/Ta/CoFeB/MgO junctions can enhance the PMA of magnetic films and eliminate the diffusion of Ta, leading to superior thermal stability and the release of VCMA effect. In addition, the Co-Fe compositional variation in CoFeB layer associated with Ta insertion is related to the changes in PMA and VCMA.
Article
Materials Science, Multidisciplinary
Joonghoe Dho, Jungbae Kim
Summary: A 65-nm thick (001) NiCo2O4 film with metallic and ferrimagnetic properties at room temperature was found to have a relatively stable magnetic domain structure. The variation in magnetic domains was mainly caused by domain rotation behavior.
Article
Nanoscience & Nanotechnology
Linlin Zhang, Jianwen Gao, Junye Che, Runhua Zhang, Chengyu Yang, Weidong Meng, Xiaowei Zhou, Zhu Liu, Yang Ren
Summary: In this study, both the ferromagnetic and exchange resonance modes were investigated in ferrimagnetic nanoscale thin films. The ferromagnetic resonance frequency was found to increase near the angular momentum compensation point, and the exchange resonance mode was observed only in a specific composition range.
ACS APPLIED NANO MATERIALS
(2023)
Article
Physics, Applied
Mio Ishibashi, Kay Yakushiji, Masashi Kawaguchi, Arata Tsukamoto, Satoru Nakatsuji, Masamitsu Hayashi
Summary: The magnetic properties of rare earth-transition metal ferrimagnetic thin films are studied. It is found that the compensation of magnetic moments of rare earth and transition metal sublattices increases with decreasing film thickness. For thin TbFeCo films, Tb atoms do not contribute to the magnetization. The perpendicular magnetic anisotropy increases with a thin Co layer but drops to zero with a thin Tb layer. The Tb concentration at which magnetic compensation occurs decreases when the underlayer is changed from Pt to Ta.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
A. Roman, A. Lopez Pedroso, K. Bouzehouane, J. E. Gomez, A. Butera, M. H. Aguirre, M. Medeiros Soares, C. Garcia, L. B. Steren
Summary: The competition between shape and perpendicular magnetic anisotropies in magnetic thin films leads to unconventional magnetic behaviors. In ferromagnetic thin films, the out-of-plane component of magnetic anisotropy can induce a transition from planar to stripe-like magnetic domains above a critical thickness, tc. This article presents a detailed study of the magnetization switching mechanism in FePt thin films where this phenomenon is observed. Micromagnetic simulations and experiments show that below tc, the reversal mechanism is well described by the two-phase model, while above this thickness, the magnetization within each stripe reverses through coherent rotation. The out-of-plane component and its temperature dependence of the magnetic anisotropy were also analyzed, indicating that substrate-induced strains are responsible for the abnormal coercive field behavior observed for FePt films with t > tc.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Jing Ming Liang, Xu Wen Zhao, Sheung Mei Ng, Hon Fai Wong, Yu Kuai Liu, Chee Leung Mak, Chi Wah Leung
Summary: We report a study on the interfacial antiferromagnetic coupling between ferrimagnetic TbIG/YIG thin films. The temperature and directional dependences of the antiferromagnetic coupling effect are observed at low temperatures. This work enriches the magnetic research of ferrimagnetic oxide films with complex structures and provides new ideas for the design of antiferromagnetically coupled spintronics devices.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Physics, Multidisciplinary
Heng-An Zhou, Li Cai, Teng Xu, Yonggang Zhao, Wanjun Jiang
Summary: In this paper, the authors investigated the optimized growth conditions of compensated ferrimagnetic insulator GdIG films, aiming to achieve a strong perpendicular magnetic anisotropy and a flat surface. Through experiments, they found that choosing a suitable growth temperature and different single crystalline garnet substrates can lead to a surface roughness approaching 0.15 nm and enhanced perpendicular magnetic anisotropy.
Article
Multidisciplinary Sciences
Xin Yu Zheng, Sanyum Channa, Lauren J. Riddiford, Jacob J. Wisser, Krishnamurthy Mahalingam, Cynthia T. Bowers, Michael E. McConney, Alpha T. N'Diaye, Arturas Vailionis, Egecan Cogulu, Haowen Ren, Zbigniew Galazka, Andrew D. Kent, Yuri Suzuki
Summary: This study introduces a ferromagnetic insulator spinel, Li0.5Al1.0Fe1.5O4 (LAFO), with low magnetic damping, perpendicular magnetic anisotropy, and no magnetic dead layer. By integrating these LAFO films with epitaxial Pt spin source layers, record low magnetization switching currents and high spin-orbit torque efficiencies are achieved.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
A. Bolyachkin, H. Sepehri-Amin, M. Kambayashi, Y. Mori, T. Ohkubo, Y. K. Takahashi, T. Shima, K. Hono
Summary: In this study, the effect of microstructural factors on coercivity was investigated, and it was found that the coercivity of SmFe12-based compounds can be improved by grain boundary diffusion of Si. Detailed microstructure characterization confirmed the diffusion of Si in the intergranular phase and the reduction of Fe and Co content. However, the presence of α-(Fe,Co) grains at the interface reduced the effectiveness of grain boundary diffusion. Therefore, high coercivity in SmFe12-type magnets can only be achieved by eliminating the α-(Fe,Co) phases.
Article
Chemistry, Physical
Y. Q. Guo, H. Bai, Q. R. Cui, L. M. Wang, Y. C. Zhao, X. Z. Zhan, T. Zhu, H. X. Yang, Y. Gao, C. Q. Hu, S. P. Shen, C. L. He, S. G. Wang
Summary: The effect of vacuum annealing on the perpendicular magnetic anisotropy of MgO/CoFeB/VV stacks was studied, showing that the PMA can be well maintained at 590 degrees C. Furthermore, there was significant segregation of Co and Fe atoms at the CoFeB/W interface after annealing at this temperature.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Talluri Manoj, Hari Prasanth Perumal, Bibekananda Paikaray, Arabinda Haldar, Jaivardhan Sinha, Pinaki Prasad Bhattacharjee, Chandrasekhar Murapaka
Summary: High entropy alloys have gained significant attention recently due to their unique microstructures and properties. Among them, the eutectic HEA AlCoCrFeNi2.1 is particularly attractive for its unprecedented mechanical properties. However, the functional properties of this alloy have not been well explored. In this study, researchers investigated the magnetic properties of nanocrystalline EHEA films grown by RF magnetron sputtering before and after annealing at different temperatures. The results showed the presence of perpendicular magnetic anisotropy (PMA) in the films annealed at 600 degrees C, while the as-deposited and annealed samples at lower temperatures only exhibited in-plane anisotropy behavior. The presence of PMA was attributed to the formation of Al2O3 on the film surface.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Applied
Hang Xie, Abhishek Talapatra, Xin Chen, Ziyan Luo, Yihong Wu
Summary: The study reveals the presence of strong damping-like spin-orbit torque in WTex thin films, with the efficiency decreasing quickly as the thickness increases. By utilizing this property, efficient current-induced perpendicular magnetization switching was achieved in WTex/Ti/CoFeB multilayers, signifying the great potential of sputter-deposited WTex in spintronics applications.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
Ajit Kumar Sahoo, J. Mohanty
Summary: The study investigates the chiral spin structures and Néel-type skyrmions in the TbCo/GdFe-based amorphous ferrimagnetic system, showing that skyrmionic configurations are stabilized with the help of dipolar interactions. Optimized thicknesses of TbCo and GdFe layers demonstrate isolated skyrmions with a variety of chiral textures observed in a wide thickness range of ferrimagnetic bilayer systems.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2021)
Article
Engineering, Electrical & Electronic
Ajit Kumar Sahoo, J. Arout Chelvane, J. Mohanty
Summary: The impact of Ti underlayer thickness on the structural, magnetic, and microscopic properties of TbFe thin films was studied. The increase in UL thickness led to intermixing at interfaces, as well as an increase in out-of-plane coercivity and saturation field. The hybridization effects and interfacial roughness played significant roles in determining the magnetic properties, offering potential applications in spintronics.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Physics, Multidisciplinary
A. K. Jena, Himadri Nandan Mohanty, J. Mohanty
Summary: The ferroelectric rhombohedral Bi0.97Y0.03Fe0.95Sc0.05O3 (BYFSO) film shows complete switching of ferroelectric domains towards upward and downward directions at 8V bias voltage, with stable bipolar resistive switching effect and significant impact of oxygen vacancy induced conductive filaments during the SET-RESET process.
Article
Physics, Applied
A. Talapatra, A. O. Adeyeye
Summary: The investigation demonstrated that tunable magnetization dynamics of coupled magnetic nanostructures can be achieved by arranging them in different lattice configurations, resulting in a significant impact on the collective behavior of static and dynamic properties. Quantitative engineering of demagnetizing factors with different lattice arrangements has been established using ferromagnetic resonance spectroscopy. Additionally, distinct spin wave modes localized in constituent nanomagnets were observed and tuned through lattice arrangements and applied field orientation, with experimental results well complemented by micromagnetic simulations.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
Qi Zhang, Zhuangzhuang Chen, Huafeng Shi, Xin Chen, Abhishek Talapatra, Xinhai Zhang, Yihong Wu
Summary: The research focuses on the investigation of THz emission from CoFeB/Cr/Pt trilayers, with Cr playing the role of both a spin current transporter and generator. Compared to bilayer emitters, THz emission from CoFeB/Cr/Pt exhibits larger ellipticity, polarization-dependent magnetic response and temporal profile.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Himalay Basumatary, J. Arout Chelvane, D. V. Sridhara Rao, A. Talapatra, J. Mohanty, Deepak Kumar, Vajinder Singh, S. Kamat, Rajeev Ranjan
Summary: This study investigated the magnetic behavior of Tb-Fe thin films with different thicknesses, revealing the presence of out-of-plane magnetic anisotropy in these films.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Applied
Mahathi Kuchibhotla, Abhishek Talapatra, Arabinda Haldar, Adekunle Olusola Adeyeye
Summary: Magnetization dynamics in single and trilayer circular permalloy nanodots with a diameter of 120 nm were investigated using broadband ferromagnetic resonance spectroscopy. Two well-separated modes were observed in single-layer nanodots, while two center modes were found in trilayer nanodots due to in-phase and out-of-phase precession of spins in magneto-dynamically coupled layers.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Mahathi Kuchibhotla, Abhishek Talapatra, Arabinda Haldar, Adekunle Olusola Adeyeye
Summary: We investigated the magnetization reversal mechanism and dynamic behavior of 90 nm wide permalloy nanowires patterned over a large area as a function of thickness and applied field orientation. The results showed that both the static and dynamic properties are sensitive to the film thickness. For thin nanowires, the reversal process is dominated by coherent rotation mode and the onset of curling mode is observed. Two well-separated modes exist, with high and low frequencies corresponding to excitations at the center and edges of the wire. For thicker nanowires, the reversal process is dominated by curling mode and the center mode frequency is sensitive to film thickness and shows biaxial anisotropy. The experimental results were supported by micromagnetic simulations. These findings have potential implications in designing reconfigurable magnonic crystals for microwave devices.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Abhishek Talapatra, Udaykumar Gajera, P. Syam Prasad, Jeyaramane Arout Chelvane, Jyoti Ranjan Mohanty
Summary: In this study, advanced neural networks and image regression algorithms were used to analyze magnetic properties based on magnetic microstructure. The results showed that this method was able to accurately predict magnetic properties, which is important for understanding the changes in magnetic properties under external perturbations.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Physics, Applied
Abhishek Talapatra, Huajun Qin, Frank Schulz, Lide Yao, Lukas Flajsman, Markus Weigand, Sebastian Wintz, Sebastiaan van Dijken
Summary: We present the imaging results of short-wavelength spin waves in a continuous nanometer-thick YIG film with a Co stripe patterned on top. The dynamic dipolar coupling between the YIG film and the Co stripe allows for partial reflection and mode conversion of spin waves at the YIG/Co edge. By using time-resolved scanning transmission x-ray microscopy, we extract the spin-wave dispersion, decay length, and magnetic damping in the YIG/Co bilayer, and analyze the dependence of spin-wave reflection on the wavelength of incoming and transmitted spin waves.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Ajit Kumar Sahoo, J. Arout Chelvane, J. Mohanty
Summary: The study investigates a GdTb-FeCo quaternary system of various thicknesses for tunable perpendicular magnetic anisotropy, with critical behavior observed at 150 nm thickness. Experimental findings are supported by 3D micromagnetic simulations.
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
