Article
Chemistry, Physical
Gian Marco Pierantozzi, Giovanni Vinai, Aleksandr Yu Petrov, Alessandro De Vita, Federico Motti, Vincent Polewczyk, Debashis Mondal, Tommaso Pincelli, Riccardo Cucini, Chiara Bigi, Ivana Vobornik, Jun Fujii, Piero Torelli, Francesco Offi, Giorgio Rossi, Giancarlo Panaccione, Francesco Borgatti
Summary: In this study, the relationship between ferromagnetism and metallicity in strained La0.67Ca0.33MnO3 films was investigated. It was found that the half-metallicity of the ferromagnetic metallic (FMM) phase is correlated with spin polarization and occupancy at the Fermi level. These results suggest that the half-metallic behavior predicted by a double-exchange model persists even in phase-separated manganites.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Ceramics
Yukuai Liu, Sixia Hu, Boyang Zhao, Xinrong Shi, Xiezong Zeng, Chi Wah Leung, Chuanwei Huang
Summary: Deliberate manipulation of topotactic transformation through oxygen insertion and extraction is an effective method for controlling the crystalline structure and magnetic properties of perovskite-based oxides. The results of this study show that precise control of oxygen composition allows for adjustable topotactic transformation and using an in-situ oxygen getter layer leads to more stable structures.
CERAMICS INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
Brajagopal Das, Lena Wysocki, Joerg Schoepf, Lin Yang, Amir Capua, Paul H. M. van Loosdrecht, Lior Kornblum
Summary: This study demonstrates the coexistence of tilted magnetic anisotropy and anisotropic in-plane magnetization in Ru-substituted La0.7Sr0.3MnO3 films, which is attractive for spin-orbit torque (SOT) based devices and other spintronic applications.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
N. Coton, J. P. Andres, E. Molina, M. Jaafar, R. Ranchal
Summary: In this study, the formation of stripe domains in electrodeposited Ni90Fe10 films was investigated. The characteristic fingerprint of stripe domains was observed when the electrolyte was not magnetically stirred during electrodeposition. Stripe domains were visible only by Magnetic Force Microscopy when the sample thickness exceeded the theoretical critical thickness. The induced in-plane magnetoelastic magnetic anisotropy was found to reduce the perpendicular magnetic anisotropy in samples grown in outward bent flexible substrates.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Y. P. Feng, R. J. Jiang, Y. L. Zhu, Y. L. Tang, Y. J. Wang, M. J. Zou, W. R. Geng, X. L. Ma
Summary: This study investigates the strain field of ferroelastic domains and misfit dislocations in perovskite ferroelectric thin films using advanced aberration-corrected transmission electron microscopy combined with geometry phase analysis. The results reveal in-plane strain and lattice rotation, and polarization rotation phenomenon in the thin films.
Article
Nanoscience & Nanotechnology
Cory D. Cress, Darshana Wickramaratne, Matthew R. Rosenberger, Zachariah Hennighausen, Patrick G. Callahan, Samuel W. LaGasse, Noam Bernstein, Olaf M. van 't Erve, Berend T. Jonker, Syed B. Qadri, Joseph C. Prestigiacomo, Marc Currie, Igor I. Mazin, Steven P. Bennett
Summary: In this work, we demonstrate the direct writing of nanoscale magnetic ordering patterns in FeRh films using focused helium-ion beam irradiation. By characterizing the changes in magnetic order induced by He+ irradiation, as well as quantifying strain- and defect-induced alterations in spin-flip energy, we show promise for the development of in-plane AF-FM spintronic devices. This approach may reduce the complexity of fabrication processes and eliminate interfacial polarization losses in such devices.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Applied
Jianliang Su, Chengwei Cai, Mei Ji
Summary: In this paper, [La0.8Ca0.2MnO3/La0.5Ca0.5MnO3](20) superlattice films with different La0.8Ca0.2MnO3 layer thicknesses were prepared by pulsed laser deposition. The crystal structures, strain, magnetic hysteresis loops, and magnetization versus temperature curves of the films were measured. The magnetic properties were comprehensively analyzed based on the strain state and magnetic phases.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Chemistry, Physical
Shekhar Tyagi, V. G. Sathe, Gaurav Sharma, Rajeev Rawat
Summary: In this study, epitaxial thin films of SrRuO3 with large strain disorder were grown using pulsed laser deposition on LSAT and SrTiO3 substrates. Magnetic force microscopy was used to visualize the evolution of magnetic domains across the two transitions in these films. The results showed that the magnetic anisotropy in the films was different for the two transitions, with perpendicular magnetic anisotropy dominating. Raman spectroscopy revealed a strong influence of magnetic order on the lattice, indicating a strong spin-phonon coupling.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Shuiqing Zhan, Yujie Huang, Wei Zhang, Bin Li, Mingmei Jiang, Zhentao Wang, Junfeng Wang
Summary: The effects of current density and electrode-normal magnetic fields on the growth and detachment characteristics of a single bubble on vertical microelectrode surface have been investigated. The results reveal that bubble coalescence behavior occurs at low current densities and can be gradually inhibited with increasing current density; external magnetic fields promote the bubble detachment behavior within a relatively large current density range.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Materials Science, Multidisciplinary
M. A. A. Bally, M. Z. Ahsan, M. A. Islam, F. A. Khan
Summary: Conventional solid-state reaction was used to prepare La0.55CaxSr0.45-xMnO3 samples, and their structural and magnetic properties were investigated using X-ray diffraction and scanning electron microscopy. Calcium doping led to a decrease in lattice parameter, affecting the DC and AC magnetic properties, and the presence of manganese deficiency and residual canted antiferromagnetic state were observed in the samples.
RESULTS IN PHYSICS
(2021)
Article
Chemistry, Physical
Binod Paudel, Kyeong Tae Kang, Yogesh Sharma, Heinrich Nakotte, Dmitry Yarotski, Aiping Chen
Summary: The study investigates the magnetotransport properties and strain release mechanisms in ferroelastic La0.9Sr0.1MnO3 (LSMO) epitaxial thin films on SrTiO3 (001) substrates with different miscut angles. The substrate miscut angle plays a critical role in releasing shear strain and has a huge impact on the properties of the films. The changes in magnetic and transport properties are attributed to the increased density of phase boundaries with the increase of miscut angle on the substrates.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Analytical
Nerija Zurauskiene, Voitech Stankevic, Skirmantas Kersulis, Milita Vagner, Valentina Plausinaitiene, Jorunas Dobilas, Remigijus Vasiliauskas, Martynas Skapas, Mykola Koliada, Jaroslaw Pietosa, Andrzej Wisniewski
Summary: The results of this study show that the microstructure, resistivity, and magnetoresistive properties of LSMO films grown by the pulsed injection MOCVD technique are strongly influenced by the concentrations of strontium and manganese. The highest metal-insulator transition temperature (T-m) observed was 270 K, while the highest low-field magnetoresistance at room temperature was 0.8%.
Article
Nanoscience & Nanotechnology
Qi Liu, Pengfei Liu, Xiaowen Li, Sixia Hu, Yuanmin Zhu, Cai Jin, Wenqiao Han, Yanjiang Ji, Zedong Xu, Songbai Hu, Mao Ye, Lang Chen
Summary: By designing and fabricating manganite-based magnetic tunnel junctions, we achieved perpendicular tunneling and observed spin-dependent tunneling behavior. The dominant role of direct tunneling was observed in the low bias region, while it was associated with thermionic emission in the high bias region.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Laura Guasco, Yury Khaydukov, Gideok Kim, Thomas Keller, Alexei Vorobiev, Anton Devishvili, Peter Wochner, Georg Christiani, Gennady Logvenov, Bernhard Keimer
Summary: This study reports a new type of device with adjustable magnetic noncollinearity. By modulating the La1-xSrxMnO3 material, highly noncollinear magnetic structures with a periodicity twice as large as the unit cell were achieved. The magnetic structure can be effectively adjusted by low magnetic fields, suggesting oxide homojunctions as a promising platform for tunable complex magnetism and spintronic device design.
ADVANCED MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Zachary J. Bergstrom, Danny Perez, Osman El-Atwani
Summary: Experimental observations of helium bubble facetation were compared to theoretical equilibrium shapes. The discrepancies between them were attributed to kinetic factors. These findings are significant for understanding the impact of helium bubbles on material degradation.
SCRIPTA MATERIALIA
(2022)
Review
Materials Science, Multidisciplinary
Peiyuan Guan, Renbo Zhu, Yanzhe Zhu, Fandi Chen, Tao Wan, Zhemi Xu, Rakesh Joshi, Zhaojun Han, Long Hu, Tom Wu, Yuerui Lu, Dewei Chu
Summary: Although AgNW networks have excellent optical transparency and mechanical flexibility, they can degrade in performance due to interactions with surrounding media such as temperature, electric field, and UV light. Extensive research has been conducted to mitigate these degradation issues and develop stable AgNW based transparent electrodes for flexible electronic devices.
CRITICAL REVIEWS IN SOLID STATE AND MATERIALS SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Yao Wang, Chenghao Duan, Xuliang Zhang, Jianguo Sun, Xufeng Ling, Junwei Shi, Long Hu, Zizhen Zhou, Xianxin Wu, Wei Han, Xinfeng Liu, Claudio Cazorla, Dewei Chu, Shujuan Huang, Tom Wu, Jianyu Yuan, Wanli Ma
Summary: All-inorganic CsPbX3 perovskite quantum dots with tunable optical bandgaps and narrow emission peaks have attracted interest in the fields of photovoltaics and light-emitting diodes. The CsPbI3 perovskite QD solar cell, fabricated through a solid-state-ligand exchange process, demonstrates high PV performance and intense electroluminescence. This multifunctional approach using CsPbI3 perovskite QDs shows promise for fabricating optoelectronic devices.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Xinwei Guan, Tao Wan, Long Hu, Chun-Ho Lin, Jialin Yang, Jing-Kai Huang, Chien-Yu Huang, Shamim Shahrokhi, Adnan Younis, Kavitha Ramadass, Kewei Liu, Ajayan Vinu, Jiabao Yi, Dewei Chu, Tom Wu
Summary: Integrating multiple semiconductors with distinct physical properties is a practical design strategy for realizing novel optoelectronic devices with unprecedented functionalities. In this work, a photonic resistive switching memory is demonstrated based on a bilayer architecture of strontium titanate quantum dots and all-inorganic halide perovskite. The device shows improved resistive switching performance, UV-visible dual-band response, and tri-mode operation.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Review
Chemistry, Multidisciplinary
Chun-Ho Lin, Long Hu, Xinwei Guan, Jiyun Kim, Chien-Yu Huang, Jing-Kai Huang, Simrjit Singh, Tom Wu
Summary: This article provides a critical review on the elusive nature of perovskite/electrode interfaces, focusing on the interfacial electrochemistry effects. It discusses the basic guidelines for electrode selection to establish non-polarized interfaces and optimize energy level alignment for perovskite materials. Furthermore, state-of-the-art strategies on interface-related electrode engineering are reviewed and discussed, aiming to achieve ohmic transport and eliminate hysteresis in perovskite devices. The role and multiple functionalities of self-assembled monolayers in improving perovskite/electrode contacts are also discussed.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Xingyu Qu, He Huang, Tao Wan, Long Hu, Zhenlu Yu, Yunjian Liu, Aichun Dou, Yu Zhou, Mingru Su, Xiaoqi Peng, Hong-Hui Wu, Tom Wu, Dewei Chu
Summary: An integrated surface coating/doping strategy has been developed to improve the structural stability and electrochemical performance of high-nickel layered oxides, leading to enhanced cycling stability and capacity retention of batteries. The strategy involves diffusion of titanium ions from a thin coating layer, formation of a protective layer on the material surface, and Ti4+ doping to enhance lithium ion diffusion and reduce side reactions, ultimately benefiting the cycling stability of the cathode.
Review
Chemistry, Multidisciplinary
Yangyang Li, Yangyu Zhu, Mingzheng Wang, Mingwen Zhao, Junmin Xue, Jingsheng Chen, Tom Wu, Scott A. Chambers
Summary: Titanium sesquioxide (Ti2O3) is a material with fascinating physical properties and wide range of applications in energy, biomedicine, and electronics. Its unique electrical and optical properties have led to interesting applications such as photothermal conversion, infrared photodetection, and electrocatalysis. Ti2O3 has been utilized in seawater desalination, hydrogen production, cancer therapy, and more.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jianguo Sun, Bin Li, Long Hu, Junjun Guo, Xufeng Ling, Xuliang Zhang, Chi Zhang, Xianxin Wu, Hehe Huang, Chenxu Han, Xinfeng Liu, Youyong Li, Shujuan Huang, Tom Wu, Jianyu Yuan, Wanli Ma
Summary: Solution processable semiconductors like organics and emerging lead halide perovskites (LHPs) are ideal candidates for photovoltaics. This study investigates a novel device architecture involving block copolymer/perovskite hybrid bulk heterointerfaces, which enhances light absorption, energy level cascade, and provides a thin hydrophobic layer to improve carrier generation and prevent moisture invasion. The resulting hybrid solar cell exhibits high efficiency and stability, and the approach can be extended to other LHPs.
ADVANCED MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Xinwei Guan, Zhihao Lei, Xuechao Yu, Chun-Ho Lin, Jing-Kai Huang, Chien-Yu Huang, Long Hu, Feng Li, Ajayan Vinu, Jiabao Yi, Tom Wu
Summary: This review comprehensively discusses the mechanisms, properties, stability, and performance of low-dimensional perovskite memories, involving both molecular-level perovskites and structure-level nanostructures. The correlation between properties and performance is explored in-depth, aiming to present effective strategies for designing memory devices based on this new class of high-performance materials. The existing challenges and future opportunities are also presented.
Article
Chemistry, Physical
Long Hu, Xinwei Guan, Tao Wan, Chun-Ho Lin, Shanqin Liu, Renbo Zhu, Weijian Chen, Yin Yao, Chien-Yu Huang, Lin Yuan, Shamim Shahrokhi, Dewei Chu, Claudio Cazorla, Junfeng Chen, Jack Yang, Jiabao Yi, Shujuan Huang, Tom Wu
Summary: This study comprehensively investigates the impact of Pb substitution on n-type CsPbIBr2 perovskite and reveals the different effects of monovalent Ag, divalent Zn, and trivalent Sb on trap densities. The Ag doping significantly reduces phase separation, while Sb doping accelerates halide segregation and Zn doping has a negligible influence. The p-doping effect of Ag shifts the Fermi level of CsPbIBr2, preventing the formation of ionic defects and reducing halide ion migration.
ACS ENERGY LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Yecheng Ding, Xuefeng Zhao, Zeen Zhao, Yaojin Wang, Tom Wu, Guoliang Yuan, Jun-Ming Liu
Summary: Lead halide perovskite materials, such as MAPbBr3 and MAPbI3, have excellent semiconductor properties and are highly promising for applications in solar cells and photodetectors. This study demonstrates that periodic strain can manipulate the built-in electric field, leading to increased short-circuit current and open-circuit voltage. Additionally, the study suggests the potential of using piezoelectric effects for multifunctional sensing, enabling measurements of light intensity, dynamic pressure, and acceleration simultaneously.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Review
Chemistry, Multidisciplinary
Uma V. Ghorpade, Mahesh P. Suryawanshi, Martin A. Green, Tom Wu, Xiaojing Hao, Kevin M. Ryan
Summary: This review provides an overview of the development of versatile chalcohalide materials, focusing on their design, synthesis, optoelectronic properties, and applications in energy conversion and storage devices. Computational techniques, theoretical and experimental approaches are employed to understand the band structures, stability, and structural chemistry of these materials. The review also discusses the challenges and future research directions in this field.
Article
Nanoscience & Nanotechnology
Xingjie Lv, Guoliang Yuan, Tom Wu, Zhibo Yan, Ben Xu, Guanghua Liu, Jun-Ming Liu
Summary: This study investigates the four different lifetimes of photocarriers in MAPbI(3) single crystal, shedding light on the physical mechanisms and facilitating the design of novel electronics with halide perovskite semiconductors.
ADVANCED ELECTRONIC MATERIALS
(2023)
Review
Multidisciplinary Sciences
Weili Yu, Feng Li, Tao Huang, Wei Li, Tom Wu
Summary: Halide perovskite heterojunctions combine the properties of multi-dimensional perovskites and selected semiconductors, surpassing the limitations of a single component. This platform allows for material property tuning, discovery of interesting phenomena, and enables novel applications.
Review
Materials Science, Multidisciplinary
Dawei Duan, Chuangye Ge, Md Zahidur Rahaman, Chun-Ho Lin, Yumeng Shi, Haoran Lin, Hanlin Hu, Tom Wu
Summary: Metal halide perovskites are easy to synthesize and have tunable physical properties and excellent performance, making them important optoelectronic materials. One-dimensional (1D) nanostructures at both the morphological and molecular levels enhance the performance of optoelectronic devices. Recent progress in the synthesis and characterization of 1D halide perovskites with tunable structures, compositions, and properties, as well as their applications in photovoltaics, light emission, and photodetection, is highlighted. Current challenges, future prospects, and promising research directions are discussed to advance the field of 1D perovskites.
NPG ASIA MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Long Hu, Qingya Li, Yuchen Yao, Qiang Zeng, Zizhen Zhou, Claudio Cazorla, Tao Wan, Xinwei Guan, Jing-Kai Huang, Chun-Ho Lin, Mengyao Li, Soshan Cheong, Richard D. Tilley, Dewei Chu, Jianyu Yuan, Shujuan Huang, Tom Wu, Fangyang Liu
Summary: This study utilizes recycled PbI2 from spent lead acid batteries to synthesize CsPbI3 quantum dots, addressing the issue of environmental pollution in traditional lead smelting processes, recycling lead waste, and successfully synthesizing high-quality quantum dots.
ACS MATERIALS LETTERS
(2022)
