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Unravelling the strong interplay for interfacial magnetic switching in metal-organic-based spintronics

Journal of Materials Chemistry C 2024年第11期12卷 3931-3942页

作者： Chen, Wan-Ting Yu, Li-Chung Lin, Jiu-Hua Cheng, Su Ling Shiu, Hung Wei Lai, Yu-Ling Chu, Ying-Hao Chin, Yi-Ying Wang, Jeng-Han Hsu, Yao-Jane National Synchrotron Radiation Research Center Hsinchu30076 Taiwan Graduate Program for Science and Technology of Accelerator Light Sources National Yang Ming Chiao Tung University Hsinchu30076 Taiwan Department of Materials Science and Engineering National Tsing Hua University Hsinchu30013 Taiwan Department of Chemistry National Taiwan Normal University Taipei11677 Taiwan Department of Photonics National Cheng Kung University Tainan70101 Taiwan Department of Physics National Chung Cheng University Chiayi62102 Taiwan

Organic semiconductors are promising building blocks for multifunctional spintronics. The spinterface plays a key role in affecting the magnetic properties of the performance of spin-based devices. Herein, we reveal the strong interfacial interplay affecting the magnetic switching at the interface of the synthetic paramagnetic tris(8-hydroxyquinoline)iron(iii) (Feq3) layer on the ferromagnetic surface. In combination with synchrotron-based analysis and density functional theory (DFT) calculations, we observed that the robust magnetic interactions of the Co/Feq3 system were strongly influenced by the interfacial reaction between Co and Feq3. As the charge transferred from the contacted Co to Feq3, the central iron was reduced from Fe(iii) to Fe(ii) and hybridized with the 8-hydroxyquinoline, causing spin polarization at the interface. The reduced central Fe(ii) exhibited apparent ferromagnetic ordering after contact with the ferromagnetic Co substrate. With increasing the Feq3 layer thickness, the central Fe reverted to its original Fe(iii) state, resulting in the disappearance of ferromagnetic ordering. The thickness dependence of the Feq3 layer on the magnetic response could be used to tune the spinterface properties and thus the interfacial magnetic interplay. These findings reveal the effect of the strong interfacial redox on the spinterface and open up a promising approach for the use of metal-organic materials in oragnic spintronic devices. © 2024 The Royal Society of Chemistry.

关键词： Organometallics

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Environmental effect on the fluorescence lifetime and quantum yield of single extended luminescent conjugated polymers

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Journal of Physical Chemistry C 2009年第43期113卷 18681-18688页

作者： Rassamesard, Areefen Huang, Yi-Fang Lee, Hsu-Yang Lim, Tsong-Shin Li, Ming Chung White, Jonathon David Hodak, Jose Hector Osotchan, Tanakorn Peng, K.Y. Chen, S.A. Hsu, Jui-Hung Hayashi, Michitoshi Fann, Wunshain Institute of Atomic and Molecular Sciences Academia Sinica P.O. Box 23-166 Taipei 106 Taiwan Department of Physics Faculty of Science Mahidol University Rama 6 Rd. Bangkok 10400 Thailand Department of Physics Tunghai University Taichung 407 Taiwan Department of Chemistry National Tsing Hua University Hsinchu 30013 Taiwan Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei 115 Taiwan Center for Condensed Matter Sciences National Taiwan University Taipei 106 Taiwan Department of Photonics Engineering Yuan Ze University Taoyuan Taiwan ThEP Center Commission of Higher Education 328 Si Ayuthaya Rd Bangkok 10400 Thailand Department of Chemical Engineering National Tsing Hua University Hsinchu 300 Taiwan Department of Materials and Optoelectronic Science National Sun Yat-sen University Kaohsiung Taiwan Institute of Polymer Science and Engineering National Taiwan University Taipei 106 Taiwan Department of Physics National Taiwan University Taipei 106 Taiwan

To investigate the local environment's effect on the lifetime and quantum yield of extended polymer chains in the absence of intra-and interchain aggregation, short, rodlike polymers of poly(2,5-di-n-octyloxy-1,4- phenylenevinylene) (DO-PPV) were dissolved in chloroform and then embedded in a polystyrene matrix. The fluorescence lifetime was found to increase by 45% in moving from the solution to the matrix form. By using the absorption and emission spectra of the chloroform solution to estimate the radiative and nonradiative rate constants for the polymer in solution, along with calculations based on an exciton model, the corresponding decay rate constants for the polymer embedded in the matrix were obtained. The close agreement between the calculated and experimental values of fluorescent lifetime in the matrix proved the applicability of the exciton model used. On the basis of the model, the average quantum yield of isolated polymers in the matrix was calculated to be a factor of 2 higher than in solutionsan effect arising from a 59% decrease in the nonradiative rate constant and, to a smaller extent, from a 20% increase in the radiative decay rate due to the different dielectric constants of the environments. These results suggest that by extending and isolating single luminescent polymers, high quantum yield devices are possible. © 2009 American Chemical Society.

关键词： Rate constants

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Exciton Localization of High-Quality ZnO/Mg_xZn_1-xO Multiple Quantum Wells on Si (111) with a Y₂O₃ Buffer Layer (vol 1, pg 3829, 2018)

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ACS APPLIED NANO MATERIALS 2018年第10期1卷 5958-5958页

作者： Liu, Wei-Rein Huang, Wei-Lun Wu, Yung-Chi Lai, Liang-Hsun Hsu, Chia-Hung Hsieh, Wen-Feng Chiang, Tsung-Hung Wan, H. W. Hong, M. Kao, J. National Synchrotron Radiation Research Center Hsinchu 30076 Taiwan Program for Science and Technology of Accelerator Light Source National Chiao Tung University Hsinchu 30010 Taiwan Department of Photonics College of Electrical and Computer Engineering National Chiao Tung University Hsinchu 30010 Taiwan Department of Photonics College of Electrical and Computer Engineering National Chiao Tung University Hsinchu 30010 Taiwan Department of Materials Science & Engineering National Tsing Hua University Hsinchu 30013 Taiwan Graduate Institute of Applied Physics and Department of Physics National Taiwan University Taipei 10617 Taiwan Department of Physics National Tsing Hua University Hsinchu 30013 Taiwan

We report the structural and optical properties of ten-period ZnO/MgxZn1–xO multiple quantum wells (MQWs) prepared on the most widely used semiconductor material, Si. The introduction of a nanometer thick high-k Y2O3transition layer between Si (111) substrate and a ZnO buffer layer significantly improves the structural perfection of the MQWs grown on top of it. The high structural quality of the ZnO/MgxZn1–xO MQWs is evidenced by the appearance of pronounced high order satellite peaks in X-ray crystal truncation rods; high resolution cross-sectional transmission electron microscopy images also confirmed the regularly arranged well and barrier layers. When the well width is less than ∼2.7 nm, the quantum-confined Stark effect in MQWs can be negligible. Not only the increasing exciton-binding energy but also reducing exciton–phonon coupling determined in temperature-dependent photoluminescence spectra indicate quantum-size effect. Our results demonstrate that ZnO/MgxZn1–xO MQWs integrated on Si have great potential in UV optoelectronic device applications.

关键词： Excitons Phonons Oxides Binding energy Layers

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Shifting the learning gears: Redesigning a project-based course on soft matter through the perspective of constructionism

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Physical Review physics Education Research 2020年第2期16卷 020147-020147页

作者： Elon Langbeheim Ariel Abrashkin Ariel Steiner Haim Edri Samuel Safran Edit Yerushalmi Graduate Program of Science and Technology Education Ben-Gurion University 8410501 Beer-Sheva Israel Department of Science Teaching Weizmann Institute of Science 7610001 Rehovot Israel Department of Chemical and Biological Physics Weizmann Institute of Science 7610001 Rehovot Israel

This article describes the redesign of a project-based course on soft and biological materials to include computational modeling. Including the construction of computational models in the course is described as a shift from constructivism—a theory that characterizes the development of formal reasoning, to constructionism—a theory that focuses on learning while constructing artifacts. This shift ameliorated two drawbacks in the original course: the limited conceptualization of entropy resulting from an unproductive use of the disorder metaphor, and the dependence of most students on the teacher for writing theoretical explanations for their final papers. In the redesigned curriculum, computer simulations provide concrete dynamic representations that students can draw upon for developing nuanced, formal reasoning on entropy and the 2nd law of thermodynamics. In addition, core computational models act as a flexible web that can be extended and modified, and allow a significant proportion of the students to build theoretical models on their own. We conclude that while the new design reflects a shift towards constructionism, we did not adopt a fully constructionist approach, rather a blend of constructivist and constructionist approaches.

关键词： Entropy Instructional materials development

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Topological photonics and beyond:introduction

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Photonics Research 2021年第1期9卷 I0001-I0002页

作者： ANDREA ALù LAURA PILOZZI HAITAN XU JINGYUN FAN Photonics Initiative Advanced Science Research CenterCity University of New YorkNew York 10031USA Physics Program Graduate CenterCity University of New YorkNew YorkNew York 10016USA Institute for Complex Systems National Research Council(ISC-CNR)Via dei Taurini 1900185 RomeItaly Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and TechnologyShenzhen 518055China State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China

Topological photonics has been opening exciting opportunities in recent optics *** this feature issue,we present a collection of papers outlining state-of-the-art and application perspectives for this thriving field o... 详细信息

关键词： beyond optics photonics

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Theoretical study of quantum size effects in thin Al(100), Al(110), and Al(111) films

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Physical Review B 2019年第20期99卷 205401-205401页

作者： Duc-Long Nguyen Ching-Ming Wei Mei-Yin Chou Institute of Atomic and Molecular Sciences Academia Sinica Taipei 10617 Taiwan Department of Physics National Central University Taoyuan City 32001 Taiwan Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei 11529 Taiwan School of Physics Georgia Institute of Technology Atlanta Georgia 30332-0430 USA

We have carried out first-principles calculations for Al(100), Al(110), and Al(111) films up to 30 monolayers to study the oscillatory quantum size effects (QSEs) exhibited in the surface energy, work function, electron-phonon coupling constants, and superconductivity transition temperature Tc. Significant oscillatory QSEs on these physical properties are reported. These oscillations are correlated with the thickness dependence of the energies of confined electrons, which can be properly modeled by an energy-dependent phase shift of the electronic wave function upon reflection at the interface. The oscillations in the surface energy and work function for Al(111) and Al(110) films as a function of film thickness can be well fitted by a damped sinusoidal function with the periodicity determined by one Fermi wave vector along the [111] direction or a combination of three Fermi wave vectors along the [110] direction. A quantitative description of these QSE requires the full consideration of the crystal band structure.

关键词： Superconductivity Surface & interfacial phenomena Thin films First-principles calculations

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Antiferromagnetic ordering of organic Mott insulator λ−(BEDSe-TTF)2GaCl4

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Physical Review B 2022年第4期106卷 045114-045114页

作者： A. Ito T. Kobayashi D. P. Sari I. Watanabe Y. Saito A. Kawamoto H. Tsunakawa K. Satoh H. Taniguchi Graduate School of Science and Engineering Saitama University Saitama 338-8570 Japan Innovative Global Program College of Engineering Shibaura Institute of Technology Saitama 337-8570 Japan Meson Science Laboratory RIKEN Saitama 351-0198 Japan Institute of Physics Goethe-University Frankfurt 60438 Frankfurt (M) Germany Department of Condensed Matter Physics Graduate School of Science Hokkaido University Sapporo 060-0810 Japan

The band structure and magnetic properties of organic charge-transfer salt λ−(BEDSe-TTF)2GaCl4 [BEDSe-TTF: bis(ethylenediseleno)tetrathiafulvalene; abbreviated as λ-BEDSe] are investigated. The reported crystal structure is confirmed using x-ray diffraction measurements, and the transfer integrals are calculated. The degree of electron correlation U/W (U: on-site Coulomb repulsion, W: bandwidth) of λ-BEDSe is larger than one and comparable to that of the isostructural Mott insulator λ−(ET)2GaCl4 (ET: bis(ethylenedithio)tetrathiafulvalene, abbreviated as λ-ET), whereas the U/W of the superconducting salt λ−(BETS)2GaCl4 [BETS: bis(ethylenedithio)tetraselenafulvalene] is smaller than one. C13-NMR and μSR measurements revealed that λ-BEDSe undergoes an antiferromagnetic (AF) ordering below TN=22 K. In the AF state, discrete C13-NMR spectra with a remaining central peak are observed, indicating the commensurate AF spin structure also observed in λ-ET. The similarity of the structural and magnetic properties between λ-BEDSe and λ-ET suggests that both salts are in the same electronic phase, i.e., the physical properties of λ-BEDSe can be understood by the universal phase diagram of bandwidth-controlled λ-type organic conductors obtained by donor molecule substitution.

关键词： Antiferromagnetism Electronic structure Mott insulators Organic compounds Strongly correlated systems DC susceptibility measurements Muon spin relaxation & rotation Nuclear magnetic resonance

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Enhanced fast charging capabilities in natural graphite/iron cross-linked pectin electrodes for lithium-ion batteries

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Materials Advances 2024年第17期5卷 6820-6829页

作者： Chung, Chin-Yi Chen, Wei-Ming Chen, Yan-Ruei Chen, Liang-Yu Su, Yu-Hsuan Chi, Po-Wei Wu, Phillip M. Chang-Liao, Kuei-Shu Tang, Hong-Yi Wu, Maw-Kuen Institute of Physics Academia Sinica 128 Section 2 Academia Road Taipei11529 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica and National Tsing Hua University 128 Section 2 Academia Road Taipei11529 Taiwan Department of Engineering and System Science National Tsing Hua University 101 Section 2 Kuang-Fu Road Hsinchu300044 Taiwan College of Science National Chung Hsing University 145 Xingda Road South District Taichung402 Taiwan Department of Applied Chemistry National Chi-Nan University 1 University Road Puli Nantou545301 Taiwan

Rapid charging capabilities are required for the broader adoption of lithium-ion batteries in emerging technologies such as electric vehicles. Although commercial graphite anodes provide a high energy density, their limitations in quick charging warrant the exploration of novel materials. This study extends prior research on the use of pectin, a natural polysaccharide, as an organic binder for graphite anodes. By introducing iron into pectin, we propose a unique ion-crosslinking mechanism that causes the graphite anode to exhibit pseudocapacitive Li storage. Our findings, corroborated by 3D Bode analysis and AC impedance spectra, revealed a positive correlation between the iron ion and the pseudocapacitive vertex in the graphite reaction. Compared with conventional binders, graphite electrodes utilizing iron-doped pectin demonstrated superior initial and stable capacities, reaching 450 mA h g−1 after 100 cycles at 1C. This study highlights the synergistic effect of pectin and iron ions, offering a new avenue for high-performance, rapid-charging, and environmentally sustainable lithium-ion batteries. © 2024 RSC.

关键词： Lithium-ion batteries

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Surface measurement by digital holography with new unwrapping method 5

Surface measurement by digital holography with new unwrappin...

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5th International Conference on Advanced Micro-Device Engineering, AMDE 2013

作者： Takahashi, Yoshitaka Sahara, Fuyuki Department of Electronics and Informatics Graduate School of Science and Technology Gunma University 1-5-1 Tenjin-cho Kiryu Gunma376-8515 Japan Education Program of Electronics and Informatics Mathematics and Physics Gunma University 1-5-1 Tenjin-cho Kiryu Gunma376-8515 Japan

ISBN: (纸本)9783038354659

Digital holography can record 3-D image of the object by using one CCD camera. Surface shape can be measured by changing angles of the object-illuminating mirror. But the measured signals are wrapped because of the periodicity of a sinusoidal function, and then phase unwrapping is needed. We have developed a new modified phase unwrapping method and applied it to surface measurement. Unwrapping errors were significantly reduced in comparison to application of the previous method.. © (2015) Trans Tech Publications, Switzerland.

关键词： Surface measurement

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Engineering Topological States in Arrays of Two-mode Nanostructured Dielectric Waveguides

Engineering Topological States in Arrays of Two-mode Nanostr...

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2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Mikhin, A.O. Rutckaia, V. Savelev, R.S. Sinev, I.S. Alu, A. Gorlach, M.A. School of Physics and Engineering Itmo University Saint Petersburg197101 Russia Photonics Initiative Advanced Science Research Center The City University of New York New York10031 United States Centre for Innovation Competence SiLi-Nano Martin-Luther-University Germany Physics Program Graduate Center The City University of New York New York10016 United States

ISBN: (纸本)9798350375909

Designs of the optical structures that support topologically nontrivial states typically rely on the combining of simple single-mode meta-atoms in a lattice with a symmetry that guarantees the occurrence of the topological states. Here, we explore an alternative approach that does not require the use of complex lattice geometries, but instead relies on the tailoring of the spatial distribution of the near fields in the individual meta-atoms operating in the multi-mode regime. To this end we consider specially designed subwavelength grating dielectric waveguides with two quasi-degenerate modes that interfere in the near-field zone leading to highly asymmetric field patterns of the propagating waves. We show that a one-dimensional array of such waveguides exhibits non-trivial topological properties and supports topological edge states even with one waveguide in the unit cell. Theoretical predictions are confirmed experimentally by visualizing the excited states of the array by measuring the intensity of the radiation at the frequency of the third harmonic. © 2024 IEEE.

关键词： Crystal lattices

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