Article
Nanoscience & Nanotechnology
Tao-Cheng Zang, Gao-Yuan Chen, Chun-Lan Ma
Summary: This study utilized first-principles calculations to explore the characteristics of high ferromagnetic transition temperature in transition metal-doped SrTiO3, revealing that Mn, Fe, and Co-doped STO systems are promising candidate materials exhibiting room-temperature ferromagnetism.
Article
Materials Science, Multidisciplinary
Derang Cao, Roman Adam, Daniel E. Burgler, Fangzhou Wang, Chengkun Song, Shandong Li, Martin Mikulics, Hilde Hardtdegen, Sarah Heidtfeld, Christian Greb, Claus M. Schneider
Summary: In this study, epitaxial magnetic Ag/Fe/Cr/Fe multilayers were excited nonthermally and nonoptically with very short electromagnetic pulses, leading to the detection of synchronous phononic-magnetic response. The detected magnetic excitations consist of up to four narrow-band high-order modes, with frequencies reaching 30 GHz, and are shown to be independent of temperature and applied external magnetic field. The strong coupling of the magnetic subsystem with the lattice of the multilayer is responsible for the rigidity of these high-frequency modes, inducing coherent lattice and magnetization dynamics in the ferromagnetic films.
Article
Materials Science, Multidisciplinary
A. Nabialek, O. Chumak, A. Lynnyk, J. Z. Domagala, A. Pacewicz, B. Salski, J. Krupka, T. Yamamoto, T. Seki, K. Takanashi, L. T. Baczewski, H. Szymczak
Summary: A strain modulated ferromagnetic resonance technique was used to measure the two cubic magnetoelastic constants of epitaxially grown Co2FexMn1-xSi magnetic layers with different Fe and Mn contents. It was found that these constants are clearly different for samples with Fe content x = 0.4 or higher, indicating different magnetoelastic properties compared to isotropic samples. Moreover, the cubic magnetocrystalline anisotropy constant reaches a maximum value at the composition of x = 0.4, corresponding to the minimum of the minor spin density of states.
Article
Chemistry, Physical
Nan Wang, Qingping Cao, Xiaodong Wang, Shaoqing Ding, Dongxian Zhang, Jian-Zhong Jiang
Summary: Deformation-induced martensitic transformation in Fe-Co-Ni-Cr-Mn high entropy alloy thin films is influenced by the grain size and nanocolumn cohesion effect. The probability of martensitic transformation from face-centered cubic (FCC) to hexagonal close-packed (HCP) phase is higher in the 150 W film compared to the films deposited at 60 W and 210 W, resulting in lower nanoindentation hardness and compressive yield strength.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Shota Noro, Mitsuru Ohtake, Tetsuroh Kawai, Masaaki Futamoto, Fumiyoshi Kirino, Nobuyuki Inaba
Summary: Co75Fe25 alloy films with different crystal structures were successfully prepared on MgO substrates. The lattice parameters of the films are similar to the bulk values, and the orientation dispersions are small. The magnetic properties of the films reflect the magnetocrystalline anisotropy of the Co75Fe25 crystal, and the magnetostriction coefficients are relatively high.
Article
Chemistry, Physical
Ting-Wei Chen, Shuang-Shuang Li, Fang Tang, Jing-Shi Ying, Ying Zhang, Zhao-Cai Wang, Shu-Juan Zhang, Fu-Sheng Luo, Lei Chen, Yong Fang, Ren-Kui Zheng
Summary: In this study, high-quality Mn2-xCrxSb (x = 0.01, 0.04, and 0.1) epitaxial thin films were grown on SrTiO3 (STO) (001) single-crystal substrates using molecular beam epitaxy. The x = 0.01 sample undergoes a quasi-ferrimagnetic (I) [Q-FIM(I)]-to-ferrimagnetic (II) [FIM(II)] spin reorientation (SR) transition and a giant magnetoresistance (MR) associated first-order ferrimagnetic(ii)-to-antiferromagnetic (AFM) phase transition upon cooling. The magnetic phase diagram of the Mn2-xCrxSb films in the low doping level region is established based on the magnetotransport and magnetic data.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Chunwang Lv, Mingjiang Hu, Tianhao Yuan, Liqiang Yan, Hongwei Chen
Summary: The objective of this work was to investigate and contrast the mechanism of different B-site dopants for catalytic activity and sulfur resistance under equivalent conditions. The introduction of specific metal cations into the B-site of perovskite could improve catalytic activity and weaken the negative effect of SO2 poisoning. While the reasons for the improvement of catalytic activity on different doped catalysts are similar, the mechanism of sulfur resistance caused by different dopants is not identical. The optimization effect of Fe dopant is better than that of Cr and Cu dopants, illustrating that the high stability of the perovskite lattice and the insensitivity to sulfur species are the key factors for its outstanding sulfur resistance.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Yu-Hong Lai, Jun-Ding Zheng, Si-Cheng Lu, Yin-Kuo Wang, Chun-Gang Duan, Pu Yu, Yun-Zhe Zheng, Rong Huang, Li Chang, Ming-Wen Chu, Ju-Hung Hsu, Ying-Hao Chu
Summary: In condensed matter physics, oxide materials exhibit diverse and intriguing physical properties, making the development of functional oxides an important field of study. This research focuses on stabilizing PbSnO3 thin films with different orientations using a heteroepitaxial approach supported by theoretical calculations. Through X-ray diffraction and transmission electron microscopy, the structural information of the thin films is revealed. The electrical characterizations confirm the anticipated antiferroelectric behavior, including double hysteresis and butterfly loops. The study also investigates the phase transition and determines the transition temperatures based on temperature-dependent structural and electrical characterizations. Furthermore, scanning transmission electron microscopy provides atomic resolution images, revealing the microscopic antiferroelectric order. This work represents a significant breakthrough in synthesizing epitaxial PbSnO3 thin films and comprehensively understanding their anisotropic antiferroelectric behavior.
Article
Nanoscience & Nanotechnology
M. Hu, Q. P. Cao, X. D. Wang, D. X. Zhang, J-Z Jiang
Summary: The effects of substrate temperature on the nanostructure and mechanical properties of fcc-structured Fe-Co-Ni-Cr-Mn HEA thin films were systematically investigated in this study. The results showed that the 573 K-film exhibited the highest hardness and Young's modulus among the films tested.
MATERIALS TODAY NANO
(2021)
Article
Energy & Fuels
Maryam Ostadebrahim, Omran Moradlou
Summary: A comparative study was conducted on the effect of transition metal cations in LaMO3 perovskite-type structures on their electrochemical hydrogen sorption/storage process. LaFeO3 nanoparticles showed the highest discharge capacity of 13,500 mAh/g due to their higher surface reactivity and faster electron transfer. The electrode demonstrated superior cycling stability and could be a potential candidate for battery applications.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Materials Science, Multidisciplinary
Lei Wang, Reza Darvishi Kamachali
Summary: This research utilized a density-based model to calculate multi-component grain boundary phase diagrams and studied the Fe-Mn-Cr, Fe-Mn-Ni, Fe-Mn-Co, Fe-Cr-Ni, and Fe-Cr-Co alloy systems. The study found that despite solute segregation enrichment, a grain boundary may have a lower solubility limit than the bulk, promoting interfacial chemical decomposition.
Article
Materials Science, Multidisciplinary
Deren Li, Xi Zhang, Wenjie He, Yong Peng, Gang Xiang
Summary: In this paper, transition-metal (TM = V, Cr, Mn, Fe, Co and Ni)-doped GeSe thin films with high-temperature ferromagnetism (FM) were fabricated by solid-source chemical vapor deposition (CVD). It was found that Mn-, Fe- and Co-doped GeSe films exhibited robust FM with high Curie temperatures and relatively high hole concentrations. Further analysis indicated that the enhanced ferromagnetism in these films was attributed to the carrier-enhanced Ruderman-Kittel-Kasuya-Yosida interaction. This study provides insights into TM-doped GeSe diluted magnetic semiconductor thin films.
SCIENCE CHINA-MATERIALS
(2023)
Review
Physics, Applied
Kazumasa Iida, Jens Hanisch, Satoshi Hata, Akiyasu Yamamoto
Summary: Since the discovery of Fe-based superconductors, efforts have been made to grow single crystals and epitaxial thin films of them for both fundamental studies and applied research. Remarkably, most Fe-based superconductors have been successfully realized in the form of epitaxial thin films. However, due to various challenges, some compounds could only be obtained as single crystals. In recent years, these issues have been solved, and those compounds have been successfully fabricated as epitaxial thin films, allowing for easier evaluation of their application potential through transport critical current measurements.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Yuru Ge, Klara Luenser, Fabian Ganss, Peter Gaal, Lukas Fink, Sebastian Faehler
Summary: Conventional martensitic transformation can only occur from austenite to martensite during cooling. However, a recent discovery of reentrant martensitic transformation, involving a transformation from martensite back to austenite upon further cooling, has attracted much attention. Materials with this reentrant transformation exhibit additional physical effects and possible applications. This study focuses on the Co-Cr-Ga-Si system, investigating the suitability of thin film growth. The researchers found that the films grow epitaxially on MgO (100) substrates and exhibit martensitic transformation under specific conditions.
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
W. K. Peria, X. Wang, H. Yu, S. Lee, I Takeuchi, P. A. Crowell
Summary: An enhanced magnetoelastic contribution to the Gilbert damping in highly magnetostrictive Fe0.7Ga0.3 thin films is reported, with a large anisotropy of the Gilbert damping observed in all films. Broadband measurements of the ferromagnetic resonance linewidths over a range of temperatures are utilized to elucidate the effect of both magnetostriction and phonon relaxation on the magnetoelastic Gilbert damping.
