Article
Materials Science, Multidisciplinary
Yue Dai, Zhongwen Lan, Zhong Yu, Ke Sun, Xiaofeng Zhang, Xiaona Jiang, Chuanjian Wu, Wei Tong
Summary: In this study, Sr0.4La0.3Ca0.3Fe11.85Al1.0Co0.15O19 was used to investigate the effect of different doping amounts of Bi2O3 on its magnetic characteristics. With the increase of Bi2O3 doping, the grain size of the sample gradually increased, while the uniformity of the grain size decreased. When the Bi2O3 doping amount was 1.0 wt%, the sample showed the best performance.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Chemistry, Physical
Yaning Lin, Lichuan Jin, Linling Li, Hui Zheng, Huaiwu Zhang
Summary: Aluminum-doped hexagonal barium ferrite film with high perpendicular magnetic anisotropy (PMA) and remanence ratio was prepared by post-annealing at high temperature on Al2O3 substrate. The crystal structure measurements showed improved crystallinity and orientation after high temperature post-annealing, while diffusion of Al ions from the Al2O3 substrate into the ferrite film occurred at 1100 degrees C annealing temperature. The diffusion phenomenon was confirmed by the distribution of elements in the cross-section, resulting in a decrease in saturation magnetization and an increase in coercivity and remanence ratio. A hexagonal barium ferrite film with large PMA field, relatively small FMR linewidth, and high remanence ratio was obtained by annealing the film at 1100 degrees C, showing potential for application in self-biased microwave devices.
CHEMICAL PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
M. Zareef Khan, Hur Abbas, K. Nadeem, Asad Iqbal, Ilse-Letofsky Papst
Summary: This study successfully synthesized hard barium ferrite, soft nickel ferrite, and their nanocomposites with different concentrations. The results showed that the nanocomposites exhibited strong magnetic interactions and spring exchange coupling between the hard and soft magnetic phases, indicating potential technological applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Junpeng Wu, Shijun Dong, Huan Li, Hui Zheng, Qiong Wu, Peng Zheng, Liang Zheng
Summary: In this study, high-valence molybdenum (Mo6+) was doped into M-type hexagonal barium ferrite (BaFe12-xMoxO19) to improve its electromagnetic performance. The results showed that the Mo6+ doping concentration had a significant impact on the crystallographic structure, morphology, and electromagnetic properties of the material. The microwave absorption properties were notably improved by the doping Mo6+, demonstrating its potential application as an absorbing material.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Si-Yun Shen, Hui Zheng, Peng Zheng, Qiong Wu, Jiang-Xia Deng, Zhi-Hua Ying, Liang Zheng
Summary: Research on the calcination conditions of barium ferrite powder shows that low temperature and long holding time are beneficial for obtaining homogeneous grain size and excellent magnetic properties.
Article
Chemistry, Physical
Xueying Wang, Yida Lei, Liang Shi, Jie Li, Lichuan Jin, Yulong Liao, Kui Liu, Huaiwu Zhang
Summary: The adjustment of crystal structures and properties by ion substitution has gained increasing interest in recent years for solving issues in LTCC microwave device preparation. In this study, Fe3+ ions were substituted in low-temperature sintered BaFe12O19, and the changes in microstructures, dielectric characteristics, and magnetic properties were examined. The results showed significant changes in the crystal lattice, dielectric properties, and magnetic parameters of BaM after the substitution of Ga3+ ions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Songsong Wu, Yeqing Liu, Yingjun Guo, Yiyang Wang, Chengshuai Shao, Long Xia, Rui Zhang, Xin Geng, Xiaoxiao Huang, Guangwu Wen, Chunyan Ding
Summary: In this study, the authors successfully promoted the H-M phase transition of nonmagnetic barium aluminosilicate (BAS) glass-ceramics by incorporating Fe3+ dopants and adding magnetic barium ferrite (BFO), leading to the formation of the magnetic celsian phase.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Engineering, Electrical & Electronic
Nitika, Anu Rana, Vinod Kumar
Summary: Co1-xFe(II)(x)Fe2O4 (x = 0, 0.25, 0.50, 0.75, 1) ferrites were synthesized by coprecipitation. The substitution of ferrous ions and annealing were found to affect the structural, optical, magnetic, and dielectric properties. The study showed that annealing increased crystallite size, improved magnetic parameters, increased optical bandgap, and enhanced dielectric properties.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Meng Zhao, Yifan Zhao, Yaojin Li, Guohua Dong, Zhexi He, Yujing Du, Yuxuan Jiang, Shaoyuan Wu, Chenying Wang, Libo Zhao, Zhuangde Jiang, Ming Liu, Ziyao Zhou
Summary: This study investigates the tunability of spin waves in Co60Al40-alloyed film with natural light. The results show that the critical angle and ferromagnetic resonance field can be shifted under illumination, leading to changes in magnetic anisotropy. The control of spin-wave resonance by sunlight can be understood by the effective photoelectron-doping-induced change of the surface magnetic anisotropy. The study demonstrates the potential of developing sunlight-tunable magnonics/spintronics devices.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Meng Zhao, Yifan Zhao, Yaojin Li, Guohua Dong, Zhexi He, Yujing Du, Yuxuan Jiang, Shaoyuan Wu, Chenying Wang, Libo Zhao, Zhuangde Jiang, Ming Liu, Ziyao Zhou
Summary: It has been discovered that natural light can modulate spin waves in Co60Al40-alloyed film, enabling reversible switching behavior. This work has significant implications for the development of future sunlight-tunable magnonics/spintronics devices.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Dongping Hu, Hui Zheng, Jun Luo, Wei Chen, Qiong Wu, Yang Zhang
Summary: In this study, multilayer regular hexagonal barium ferrite nanodot arrays were successfully prepared by pulsed laser deposition through a porous anodic alumina template. The nanodot arrays displayed a c-axis oriented crystal with a multilayer regular hexagonal structure, and the degree of orientation was improved by postannealing. The high squareness ratio along the easy magnetization direction suggests potential applications in self-biased microwave devices.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Physics, Multidisciplinary
Jieyu Zhou, Jianhong Rong, Huan Wang, Guohong Yun, Yanan Wang, Shufei Zhang
Summary: This study uses the FMR method to investigate the properties of a ferromagnetic thin film, showing that external stress and uniaxial anisotropy significantly affect the FMR frequency, linewidth, and the imaginary part of magnetic susceptibility.
Article
Physics, Multidisciplinary
Viatcheslav I. Safarov, Igor V. Rozhansky, Ziqi Zhou, Bo Xu, Zhongming Wei, Zhan-Guo Wang, Yuan Lu, Henri Jaffres, Henri-Jean Drouhin
Summary: We report on the carrier dynamics in a spin photodiode based on a ferromagnetic-metal-GaAs tunnel junction. Our findings show that the helicity-dependent current in this device is not only determined by electron spin polarization and spin asymmetry of tunneling, but also by a dynamic factor resulting from the competition between tunneling and recombination in the semiconductor, as well as the charge polarization of the photocurrent. These factors can be efficiently controlled through electrical bias. Additionally, under a longitudinal magnetic field, we observe a significant increase in the signal due to the inverted Hanle effect, which is a characteristic of its spin origin. This approach represents a radical shift in the physical description of this family of emerging spin devices.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Ceramics
Muhammad Zarrar Khan, Iftikhar Hussain Gul, Farooq A. Tahir
Summary: Ba-Sr hexaferrite nanoparticles were synthesized using Sol-Gel auto combustion, and their composites with MWCNTs and conductive polymers were synthesized using carrier fluid ultra-sonication dispersion and in-situ polymerization. Structural investigations were conducted to analyze the samples. The results showed good energy dissipation behavior and decreased magnetism in the composites due to weakened exchange coupling or domain wall pinning. The microwave absorption of the samples was evaluated, and the maximum total shielding effectiveness was observed at resonant frequencies relevant to military radars.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Patrick Cottingham, Richard L. Brutchey
Summary: We investigated the local structure of BaTiO3 nanocrystals using pair distribution function analysis, and found that the Ti4+ displacements in the local structure have the same coherence length as the overall perovskite structure.
