Article
Chemistry, Multidisciplinary
Yanfei Zhu, Lidan Guo, Jun Guo, Luyang Zhao, Chunyan Li, Xueying Qiu, Yang Qin, Xianrong Gu, Xiangnan Sun, Zhiyong Tang
Summary: Quantum-confined atomically precise metal nanoclusters (MNCs) are a new type of inorganic-organic hybrid semiconductor that have been widely used in chemical sensing, optical imaging, biomedicine and catalysis. Researchers have successfully designed and fabricated a spin valve (SV) based on MNCs, demonstrating remarkable magnetoresistance values and the ability to change the spin-dependent transport properties by altering the atomic structure of the MNCs.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Inorganic & Nuclear
Arwa I. A. Elsharawy, S. M. Yakout, M. A. Wahba, Ayman A. Abdel-Shafi, M. Sh Khalil
Summary: Notable ferromagnetic features were observed in lightly multidoped Cu0.97Mn0.01Fe0.01Ni0.01O composition at room temperature. The synthesized compositions showed a high purity mono-phase of monoclinic CuO structure with no other impurities. The incorporation of transition metals resulted in the formation of long absorption tails and red shifts in the band gap energy of CuO. Cu0.97Mn0.01Fe0.01Ni0.01O exhibited a perfect ferromagnetic performance with high saturation magnetization and coercivity at room temperature.
SOLID STATE SCIENCES
(2023)
Article
Crystallography
Debajit Deb, Bikram Kishore Mahajan
Summary: In this study, modeling of phonon and defect-induced spin relaxation length (L-S) in Fe3O4 and organic semiconductor (OSC) Alq(3) has been demonstrated. The results show that L-S of Alq(3) decreases with enhanced disorder and film thickness at a low film width regime. An exponential change of L-S at low width regime is found for Alq(3) but not for Fe3O4, indicating comparable spin-dependent scattering and L-S in Fe3O4. L-S also decreases with spin-flip probability for both Alq(3) and Fe3O4. Voltage-dependent tunnel magnetoresistance (TMR) response in Fe3O4/Alq(3)/Co and LSMO/Alq(3)/Co hybrid magnetic tunnel junction (MTJ) devices is attributed to modified spin filter effect across magnetic/OSC junction at high bias regime. TMR reduction with Alq(3) thickness for Fe3O4 device is attributed to spin relaxation at the organic spacer layer. A low bias peak from differential TMR indicates spin-polarized injection for both MTJ devices. Enhanced in-plane spin transfer torque for both MTJ devices is associated with modified spin filtering at magnetic/OSC junctions. Lower TMR signal for LSMO device indicates reduced tunneling and enhanced carrier injection across the OSC, which is also supported by the band structure profile. The TMR response observed from simulation results matches well with previously reported experimental results. Higher TMR response for Fe3O4 device indicates the possibility of device employment in room temperature magnetic recording applications.
Article
Materials Science, Multidisciplinary
Guangqiang Mei, Wei Tan, Xingxia Cui, Cong Wang, Qing Yuan, Yafei Li, Cancan Lou, Xuefeng Hou, Mengmeng Zhao, Yong Liu, Wei Ji, Xiaona Zhang, Min Feng, Limin Cao
Summary: Researchers have achieved room-temperature ferromagnetism by doping Fe into SnSe. This ferromagnetic semiconductor has a large bandgap and may be applied in next-generation information device technologies, with the advantage of scalability for industrial production.
MATERIALS TODAY PHYSICS
(2023)
Article
Physics, Applied
Kinjal A. Chauhan, Anuj K. Sharma, Yogendra Kumar Prajapati
Summary: A weak magnetic field sensor based on the magnonic crystal at room temperature is described in this paper. The calculation of magnonic bandgaps frequency shifts is achieved by solving the eigenvalue problem of the Landau-Lifshitz equation using the finite element method. It is found that the sensor's performance is enhanced for smaller thickness and larger periodicity, and the proposed sensor is superior to the currently available state-of-the-art magnetometers in terms of sensitivity, LOD, miniaturization, and material, etc.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Physics, Multidisciplinary
Yu-Zhang Jiao, Dmitry V. Louzguine-Luzgin, Ke-Fu Yao, Zheng-Jun Zhang, Na Chen
Summary: In this study, a magnetic semiconductor with a high Curie temperature is presented for the development of spintronic devices in next-generation computing systems. The semiconductor exhibits low resistivity and high saturation magnetization at room temperature, and forms a heterojunction with p-type silicon, showing rectifying characteristics. These findings provide design principles for high Curie temperature magnetic semiconductors with determined conduction types, which are crucial for realizing nonvolatile spin-based transistors in information technology beyond Si-based systems.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2023)
Article
Nanoscience & Nanotechnology
Wei-Yang Chou, Sheng-Kuang Peng, Fu-Hsuan Chang, Horng-Long Cheng, Jr-Jeng Ruan, Tsung-Yeh Ho
Summary: This study introduces Ni atom dopants and adjusts the growth temperature to achieve a series of ferromagnetic organic semiconductor (FOS) films with room-temperature ferromagnetic properties, one of which has a maximum coercivity of 257.6 Oe. The spin-exchange interaction between a Ni atom and a pentacene molecule is detected, supporting the development of new spintronic devices with structural flexibility and room-temperature ferromagnetism.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Inorganic & Nuclear
Nicolas Montenegro-Pohlhammer, Rocio Sanchez-de-Armas, Carmen J. Calzado, Merlys Borges-Martinez, Gloria Cardenas-Jiron
Summary: The study demonstrates that NiTP-PAPy strongly adsorbs on the Au(111) surface in both high spin and low spin configurations, and the photoinduced switching is preserved upon adsorption. DFT-NEGF calculations indicate that the current passing through the molecular junction-like systems is much higher in the high spin configuration, and the current in the ferromagnetic junction is highly spin-polarized.
DALTON TRANSACTIONS
(2021)
Article
Materials Science, Multidisciplinary
Qingyu Hou, Mude Qi, Chunwang Zhao
Summary: This study investigated the magnetic mechanism of point defects on the ZnO: Be/Mg/Ca system using first principles, and found that the magnetism comes from the itinerant electrons produced by negative monovalent oxygen ions. The doping system was found to have the best stability among the three systems.
Article
Materials Science, Ceramics
S. M. Yakout, Arwa I. A. Elsharawy, M. A. Wahba, Ayman A. Abdel-Shafi, M. Sh Khalil
Summary: This study investigates the introduction of robust room temperature ferromagnetic properties in perovskite BaSnO3 using Zr and/or Mn, Fe or Co ions, which could be used for high performance information applications. Through the doping of ions, the morphology of BaSnO3 is improved from inhomogeneous large grains to well distributed small ones. X-ray analysis reveals a relationship between the ionic size of dopants and the crystal dimension of BaSnO3. Addition of Zr and/or Mn, Fe or Co ions also enhances the absorption capability of BaSnO3.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Wei-Yang Chou, Po-Hsiang Fang, Wen-Chieh Chiang, Horng-Long Cheng
Summary: We have successfully fabricated a magnetic semiconductor thin film composed of polymer and magnetic nanoparticles, and demonstrated strong spin coupling between the polymer molecules and the magnetic nanoparticles.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Multidisciplinary Sciences
Young-Hoon Kim, Yaxin Zhai, Haipeng Lu, Xin Pan, Chuanxiao Xiao, E. Ashley Gaulding, Steven P. Harvey, Joseph J. Berry, Zeev Valy Vardeny, Joseph M. Luther, Matthew C. Beard
Summary: Traditional optoelectronic approaches rely on both electrical and magnetic fields to control spin, charge, and light, while the use of chiral-induced spin selectivity (CISS) technology allows for the fabrication of a spin-LED that operates at room temperature without the need for magnetic fields or ferromagnetic contacts.
Article
Materials Science, Multidisciplinary
Liang Liu, Guowei Zhou, Xinyu Shu, Changjian Li, Weinan Lin, Lizhu Ren, Chenghang Zhou, Tieyang Zhao, Rui Guo, Qidong Xie, Han Wang, Jing Zhou, Ping Yang, Stephen J. Pennycook, Xiaohong Xu, Jingsheng Chen
Summary: In this study, the current-induced spin-orbit torque phenomenon in an all-oxide bilayer was investigated, and reversible switching of LSMO magnetization by electrical current was discovered. The results show that different directions of spin-orbit torque switching can be achieved by controlling the magnetic anisotropy. These findings may stimulate further development in spin-orbit torque studies in all-oxide systems.
Article
Chemistry, Physical
Qi Zhang, Qian Ma, Xueying Wang, Yi Wang, Dongheng Zhao
Summary: In this study, a series of CeO2/WO2.9 composites with tunable structure and thickness were fabricated by innovating the addition of H2WO4 during the hydrothermal process. The optimal Ce/W-0.25 sensors showed a higher response value of 23.68 to 100 ppm n-butanol at room temperature compared to pure CeO2 (1.26) at 200 degrees C. The unique surface double oxygen defect engineering between CeO2 and WO2.9 played a significant role in gas sensing, the formation of the CeO2-WO2.9 heterojunction, and the effective surface/interface transport mechanism. The electron transfer between WO2.9 and CeO2 facilitated the interconversion between Ce3+ and Ce4+ driven by oxygen defects on the surface of CeO2. This work provides new insights and a facile fabrication pathway for developing novel n-butanol gas sensors with excellent sensing performance at room temperature.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Ali Sarikhani, Laleh Avazpour, Wipula Liyanage, Raul Florez, Eric Bohannan, Dave Satterfield, Manashi Nath, Julia E. Medvedeva, Yew San Hor
Summary: Polycrystalline Zn1-xCrxTe samples with different Cr concentrations were synthesized, and their physical properties were studied. The results showed that the material exhibited either semiconducting or conducting behavior depending on the Cr concentration, and Cr doping induced ferromagnetic behavior in ZnTe. The Zn0.80Cr0.20Te sample exhibited ferromagnetic properties above room temperature.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Xin Yang, Rong Wu, Biyuan Zheng, Ziyu Luo, Wenxia You, Huawei Liu, Lihui Li, Yushuang Zhang, Qin Tan, Delang Liang, Ying Chen, Junyu Qu, Xiao Yi, Xingjun Wang, Jun Zhou, Huigao Duan, Shuangyin Wang, Shula Chen, Anlian Pan
Summary: Transition metal dichalcogenides (TMDs) have emerged as building blocks for nanoscale light sources. In this study, a waveguide-integrated light-emitting device based on TMDs is demonstrated, showing efficient optical routing and confinement. The device exhibits clear rectification under forward biasing and produces electroluminescence (EL) at a high driving current, indicating facilitated carrier injection via intervalley scattering.
Article
Chemistry, Multidisciplinary
Wanli Yang, Tiantian Huang, Junbo He, Shuaijun Zhang, Yan Yang, Weiming Liu, Xun Ge, Rui Zhang, Mengxia Qiu, Yuxiang Sang, Xingjun Wang, Xiaohao Zhou, Tianxin Li, Congfeng Liu, Ning Dai, Xin Chen, Zhiyong Fan, Guozhen Shen
Summary: This study demonstrates the formation of a lateral homosuperlattice (MLHS) with alternating 1T and 2H domains in a 2D WS2 monolayer plane. The 2H domains, laterally localized and isolated by potential wells, exhibit junction interfaces and irradiated photoluminescence (PL) with a lateral periodic distribution in the two-dimensional plane. The research on MLHSs provides insight into lateral homojunctions and homosuperlattices in a monolayer plane, offering an alternative approach to modulate optical and electronic behaviors in TMD monolayers.
Article
Optics
Rayhani Jawher, Mehrez Oueslati, Vincent Sallet, Jean-Christophe Harmand, Radhwen Chtourou
Summary: Temperature-dependent photoluminescence measurements were performed on self-assembled InAs quantum dots grown by molecular beam epitaxy. Non-monotonic evolutions of the PL spectral parameters as a function of temperature were observed in the low-temperature regime. The anomalous increase in the integrated intensity and sigmoidal variation of the PL peak energy with increasing temperature were attributed to the optical emission from deep states in the quantum dots. A rate equation model successfully described the evolution of the integrated PL intensity with temperature, providing insight into the thermally activated intra-dot redistribution of carriers.
JOURNAL OF LUMINESCENCE
(2023)
Article
Physics, Condensed Matter
Agatha C. Ulibarri, Rishabh Kothari, Alejandro Garcia, Jean-Christophe Harmand, Sangjun Park, Fabian Cadiz, Yves Lassailly, Jacques Peretti, Alistair C. H. Rowe
Summary: A systematic study was conducted on the spin-dependent recombination (SDR) in dilute nitride alloys of GaAs1-xNx as a function of nitrogen content. The results showed that the density of electronically active defects and the SDR process increase with increasing nitrogen content, emphasizing the importance of including nonspin-dependent recombination channels in a complete model of SDR.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2023)
Article
Chemistry, Physical
Bin Zhang, Johan Klarbring, Fuxiang Ji, Sergei Simak, Igor A. Abrikosov, Feng Gao, Galyna Yu Rudko, Weimin M. Chen, Irina A. Buyanova
Summary: Phonon-phonon and electron/exciton-phonon coupling are found to play a vital role in the thermal, electronic, and optical properties of metal halide perovskites. Our study focuses on the evaluation of phonon anharmonicity and coupling between electronic and vibrational excitations in the novel material, Cs2NaFeCl6, through Raman measurements and theoretical calculations. The results highlight the significance of phonon-phonon and electron-phonon interactions in the electronic properties of Cs2NaFeCl6.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Hao Chen, Xun Ge, Yiming Wang, Qianqian Xu, Zhifeng Li, Xiaohao Zhou, Jiaming Hao, Weida Hu, Shengjuan Li, Xingjun Wang
Summary: This study demonstrates the tuning of the bandgap of thin film black phosphorus from 2.9 μm to 3.9 μm by applying in-plane uniaxial strain. The highly tunable bandgap of black phosphorus in the mid-infrared regime opens opportunities for mid-infrared light-emitting diodes and lasers using layered materials.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Analytical
Nanxin Fu, Jiazhen Zhang, Yuan He, Xuyang Lv, Shuguang Guo, Xingjun Wang, Bin Zhao, Gang Chen, Lin Wang
Summary: This study prepared a photodetector based on a hybrid dimensional heterostructure of multiwall carbon nanotubes (MWCNTs) and multilayered MoS2. With the high mobility of carbon nanotubes and efficient interband absorption of MoS2, broadband detection from visible to near-infrared was achieved. The device exhibited exceptional responsivity, detectivity, and external quantum efficiency, providing a new option for optoelectronic devices based on low-dimensional materials.
Article
Physics, Applied
Y. Q. Huang, V Polojarvi, A. Aho, R. Isoaho, T. Hakkarainen, M. Guina, I. A. Buyanova, W. M. Chen
Summary: This study demonstrates the existence of nonlinear spin response in nonmagnetic materials and showcases it in a (Ga, N)As-InAs quantum dot coupled all-semiconductor nanostructure. The observed spin nonlinearity can be conveniently tuned with an external magnetic field and potentially operates at a speed exceeding 1 GHz.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Applied
Kaito Nakama, Mitsuki Yukimune, Naohiko Kawasaki, Akio Higo, Satoshi Hiura, Akihiro Murayama, Mattias Jansson, Weimin M. Chen, Irina A. Buyanova, Fumitaro Ishikawa
Summary: This study reports the growth of GaAs/GaInNAs/GaAs core-multishell nanowires with a triple quantum-well structure. The nanowires were grown via selective area plasma-assisted molecular beam epitaxy and exhibited finely controlled structures and targeted nitrogen concentrations.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Fuxiang Ji, Johan Klarbring, Bin Zhang, Feng Wang, Linqin Wang, Xiaohe Miao, Weihua Ning, Muyi Zhang, Xinyi Cai, Babak Bakhit, Martin Magnuson, Xiaoming Ren, Licheng Sun, Mats Fahlman, Irina A. Buyanova, Weimin M. Chen, Sergei I. Simak, Igor A. Abrikosov, Feng Gao
Summary: Lead-free halide double perovskites (HDPs) have been synthesized with remarkable and fully reversible thermochromism. The thermochromism in Cs2NaFeCl6 is attributed to electron-phonon coupling, and it exhibits higher temperature sensitivity compared to lead halide perovskites and conventional semiconductors. The Cs2NaFeCl6 single crystal shows excellent environmental, thermal, and thermochromic cycle stability. This study provides valuable insights and new possibilities for developing efficient thermochromic materials.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Bin Zhang, Yuqing Huang, Fuxiang Ji, Xiaohe Miao, Feng Gao, Weimin M. Chen, Irina A. Buyanova
Summary: We report the first observation of second harmonic generation (SHG) from halide double perovskite single crystals. The SHG efficiency of these materials with centrosymmetric crystalline structures is strongly dependent on the measurement temperature, increasing by up to 3 orders of magnitude at low temperatures under light illumination. The enhancement is attributed to the build-up of a light-induced electric field within the near-surface region.
Article
Materials Science, Multidisciplinary
D. Beret, L. Ren, C. Robert, L. Foussat, P. Renucci, D. Lagarde, A. Balocchi, T. Amand, B. Urbaszek, K. Watanabe, T. Taniguchi, X. Marie, L. Lombez
Summary: We investigated the diffusion process of negatively charged excitons in a WSe2 monolayer and found nonlinear diffusion behavior. The dynamics of different excitonic species were examined, and a bimolecular formation mechanism was proposed. Based on our experimental observations, a phenomenological model suggesting the coexistence of two populations, with different diffusion mechanisms, was proposed.
Article
Chemistry, Multidisciplinary
Capucine Tong, Amaury Delamarre, Romaric De Lepinau, Andrea Scaccabarozzi, Fabrice Oehler, Jean-Christophe Harmand, Stephane Collin, Andrea Cattoni
Summary: This study introduces a core-shell GaAs/GaInP nanowire solar cell grown by molecular beam epitaxy on a patterned Si substrate, and investigates its optoelectronic properties and limitations. The results show a power conversion efficiency of almost 3.7% and an open-circuit voltage of 0.65 V, which are state-of-the-art values for a nanowire array solar cell on Si. The study also quantifies the quasi-Fermi level splitting in the nanowire array solar cell and provides insights into the main absorption and electrical losses.