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Effect of Surface Roughness on the Magnetism, Nano-indentation, Surface Energy, and Electrical Properties of Co60Fe20Dy20 Films on Si (100) Substrate

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Journal of Electronic materials 2024年第4期53卷 1752-1762页

作者： Liu, Wen-Jen Chang, Yung-Huang Chiang, Chia-Chin Chen, Yuan-Tsung Lin, Chih-Chien Chen, Pei-Ling Lin, Shih-Hung Department of Materials Science and Engineering I-Shou University Kaohsiung840 Taiwan Bachelor Program in Industrial Technology National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Department of Mechanical Engineering National Kaohsiung University of Science and Technology Kaohsiung City80778 Taiwan Graduate School of Materials Science National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Department of Electronic Engineering National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan

In this study, we focused on depositing a target material, cobalt-iron-dysprosium (Co60Fe20Dy20), onto silicon (Si) (100) substrates with thickness varying from 10 nm to 50 nm through a direct-current (DC) magnetron sputtering technique. The subsequent step involved subjecting the samples to an hour-long annealing process in a vacuum annealing furnace at temperatures of 100°C, 200°C, and 300°C. To assess the elemental composition of the CoFeDy films, energy-dispersive X-ray spectroscopy (EDS) was employed. An observed trend indicated an increase in low-frequency alternating-current magnetic susceptibility (χac) with the increasing thickness. Remarkably, the CoFeDy films exhibited their peak χac following annealing at 300°C, with an optimal resonance frequency of 50 Hz. After annealing at 300°C, the CoFeDy film’s surface energy peaked at 50 nm. The magnetic, electrical, and adhesive properties of the CoFeDy films were notably influenced by surface roughness at different annealing temperatures. Atomic force microscopy (AFM) analysis revealed a gradual reduction in film roughness post-annealing, corresponding to smoother surfaces indicative of a weaker domain wall pinning effect, heightened carrier conductivity, and increased liquid spreading. Collectively, these outcomes contributed to diminished χac, reduced electrical resistance, and enhanced adhesion. Graphical Abstract: (Figure presented.) © The Minerals, Metals & materials Society 2024.

关键词： Adhesion

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Unconventional assemblies of bisacylhydrazones:The role of water for circularly polarized luminescence

Aggregate

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Aggregate 2022年第5期3卷 185-193页

作者： Hye Jin Cho Dong Yeun Jeong Hwihyun Moon Taewoo Kim You Kyoung Chung Yeongdong Lee Zonghoon Lee Joonsuk Huh Youngmin You Changsik Song Department of Chemistry Sungkyunkwan UniversitySuwonGyeonggi 16419Republic of Korea Division of Chemical Engineering and Materials Science Graduate Program in System Health Science and EngineeringEwha Womans UniversitySeoul 03760Republic of Korea Center for Multidimensional Carbon Materials Institute for Basic Science(IBS)Department of Materials Science and EngineeringUlsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea

Understanding the precise molecular arrangement of chiral supramolecular polymers is essential not only to comprehend complex superstructures like proteins and DNA but also for the development of next-generation optoelectronic materials,including materials displaying high-performance circularly polarized luminescence(CPL).Herein,we report the first chiral supramolecular polymer systems based on hydrazone–pyridinium conjugates comprising alkyl chains of different lengths,which afforded control of the apparent supramolecular *** supramolecular chirality is governed basically by the remote chiral centers of alkyl chains,helicity inversion was achieved by controlling the conditions under which the hydrazone building blocks underwent aggregation(i.e.,solvent compositions or temperature).More importantly,the addition of water to the system led to aggregationinduced hydrazone deprotonation,which resulted in a completely different selfassembly *** water molecules played an essential role,forming the assembly’s channel-like backbone,around which hydrazone molecules gathered as a result of hydrogen bonding *** co-assembly of an achiral hydrazone luminophore with the given supramolecular polymer system allowed the fabrication of a novel CPL-active hydrazone-based material exhibiting a high maximum value for the photoluminescence dissymmetry factor of -2.6×10^(-2).

关键词： circularly polarized luminescence(CPL) helicity control hydrazone self-assembly structural water supramolecular polymerization

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OPEN-SOURCE TOOLS FOR THE REFRACTORY ENGINEER OF THE PRESENT AND THE FUTURE 17

OPEN-SOURCE TOOLS FOR THE REFRACTORY ENGINEER OF THE PRESENT...

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17th Unified International Technical Conference on Refractories, UNITECR 2022

作者： Moreira, M.H. Santos, M.F. Pandolfelli, V.C. Federal University of Sao Carlos Graduate Program in Materials Science and Engineering SP Sao Carlos Brazil

Technology advances in the last century were able to reshape the world we live in. Relationships were physically and virtually changed by innovations going from transportation (engines, airplanes), to communication, (with phones, internet, and satellites). Considering this, the abilities and skills required for the young professionals have been shifting dramatically, and the refractory industry has demanded those that understand this new world and are able to solve its challenging problems. Because of the complexity of materials knowledge, which includes the latest advances in modeling and data science, a sophisticated blend of fundamental concepts and advanced techniques that defies how to promote education effectively was generated. For instance, the heat transfer mechanisms within the refractory material can be both discussed on the fundamental level or on how to perform advanced simulations to describe it, granting the engineer the ability to solve real-life problems. The present work aims to classify this new set of needed tools, explore options to conciliate fundamentals with advanced tools and conjecture strategies to educate the present and future professionals. As a conclusion, the minimum package of skills is presented considering the association of industry, academics, students and computing, all synergistically working together to solve the new challenges and promote true innovation. © 2022 Unified International Technical Conference on Refractories, UNITECR 2022 - Proceedings. All rights reserved.

关键词： Refractory materials

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Neuromodulation of the peripheral nervous system:Bioelectronic technology and prospective developments

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BMEMat(BioMedical engineering materials) 2024年第1期2卷 88-114页

作者： Hayoung Song Moohyun Kim Enji Kim Jakyoung Lee Inhea Jeong Kyeonghee Lim Seoung Young Ryu Myoungjae Oh Younhee Kim Jang-Ung Park Department of Materials Science and Engineering Yonsei UniversitySeoulSouth Korea Center for Nanomedicine Institute for Basic Science(IBS)SeoulSouth Korea Department of Neurosurgery Yonsei University College of MedicineSeoulSouth Korea Graduate Program of Nano Biomedical Engineering(NanoBME) Advanced Science InstituteYonsei UniversitySeoulSouth Korea

The peripheral nervous system(PNS)is a fascinatingly complex and crucial component of the human body,responsible for transmitting vital signals throughout the body's intricate network of *** efficient functioning is paramount to our health,with any dysfunction often resulting in serious medical conditions,including motor disorders,neurological diseases,and psychiatric *** strides in science and technology have made neuromodulation of the PNS a promising avenue for addressing these health *** involves modifying nerve activity using a range of techniques,such as electrical,chemical,optical,and mechanical *** plays a critical role in this effort,allowing for precise,controlled,and sustained stimulation of the *** paper provides an overview of the PNS,discusses the current state of neuromodulation devices,and presents emerging trends in the field,including advances in wireless power transfer and materials,that are shaping the future of neuromodulation.

关键词： bioelectronics neuromodulation peripheral nervous system

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Effect of Yttrium Treatment on Germanium-Oxide-Based Interfacial Layer of Ge P-Channel Metal–Oxide–Semiconductor Field-Effect Transistor Fabricated Through In Situ Plasma-Enhanced Atomic Layer Deposition

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IEEE Transactions on Electron Devices 2024年第3期71卷 1-6页

作者： Li, Hui-Hsuan Lin, Kuan-Yu Tsai, Yi-He Lin, Yu-Hsien Chien, Chao-Hsin Institute of Electronics National Yang Ming Chiao Tung University Hsinchu Taiwan Graduate Program for Nanotechnology Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu Taiwan Department of Electronic Engineering National United University Miaoli Taiwan

This study investigated the effect of yttrium (Y) treatment on a germanium (Ge)-oxide-based interfacial layer (IL) through in situ plasma-enhanced atomic layer deposition (PEALD). Time-of-flight secondary-ion mass spectrometry revealed that the surface reaction and deposition could be successfully performed with a Y precursor, and X-ray photoelectron spectroscopy (XPS) revealed that Y treatment on an IL can suppress GeO

$_{\text{x}}$

volatilization. A metal–oxide–semiconductor capacitor gate-stack with a Y-GeO

$_{\text{x}}$

IL has a low leakage current density (2.1

$\times$

$^{-\text{5}}$

A/cm

$^{\text{2}}$

) and a low interface trap density (approximately 5.5

$\times$

$^{\text{11}}$

$^{-\text{1}}$

$^{-\text{2}}$

) under optimized temperatures. Moreover, the Ge P-channel metal–oxide–semiconductor field-effect transistor (P-MOSFET) containing a gate-stack with a Y-treated Ge-oxide-based IL exhibited a high I

$_{\biosc{on}}$

$_{\biosc{off}}$

ratio and low OFF-state current. Therefore, applying the proposed Y treatment on the IL of a Ge P-MOSFET can help achieve a subnanometer equivalent oxide thickness (EOT) and an

关键词： Ge-oxide-based germanium germanium oxide (GeOx) in situ interfacial layer (IL) plasma-enhanced atomic layer deposition (PEALD) Y-GeOx yttrium

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Terahertz phonon polariton concentrator based on perovskite oxides

Terahertz phonon polariton concentrator based on perovskite ...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Xu, Rui Lin, Tong Luo, Jiaming Chen, Xiaotong Blackert, Elizabeth R. Moon, Alyssa R. JeBailey, Khalil M. Zhu, Hanyu Department of Materials Science and Nano Engineering Rice University Houston United States Applied Physics Graduate Program Rice University Houston United States Program Rice University Houston United States

ISBN: (纸本)9781957171258

We report the experimental demonstration of surface phonon-polaritonic devices in a broad spectral range of 7-13 THz based on SrTiO3. We designed planar ultrafast concentrators that amplifies transient electric field by 6 times and measured an average field of 0.5 GV/m in an optically resolvable area in the far field. © 2023 The Author(s)

关键词： Perovskite

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DAMAGE TOLERANCE OF DOUBLE-DOUBLE LAMINATES 23

DAMAGE TOLERANCE OF DOUBLE-DOUBLE LAMINATES

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23rd International Conference on Composite materials, ICCM 2023

作者： Melo, Jose Daniel D. Cunha, Rayane D. Targino, Talita G. Freire Junior, Raimundo C.S. Ferreira, Evans P.C. Medeiros, Antonio M. Department of Materials Engineering Federal University of Rio Grande do Norte Natal Brazil Graduate Program in Materials Science and Engineering Federal University of Rio Grande do Norte Natal Brazil SENAI Innovation Institute Natal Brazil

Double-double (DD) lay-up is a new configuration strategy for the design of composite laminates, which allows the use of simplified stacking sequences that leads to potential advantages, such as improved manufacturability and design optimization, as compared to traditional quadriaxial laminates (Quad), which are limited to ply angles of 0°, ±45° and 90°. With the double-double concept, through-the-thickness homogenization is facilitated using thinner sub-laminates and, consequently, profile optimization through thickness tapering becomes possible. In this work, damages after impact and after CAI tests of a double-double laminate (+50/0/-50/0)10 and a hard conventional laminate of equivalent in-plane stiffness (03/90/±45/02/±45)2S are compared. According to the data presented, maximum delaminated areas were of the same order of magnitude for the quad and for the DD laminates, under both conditions: after impact and after CAI tests. The results contribute to the understanding of potential benefits of the double-double concept to damage resistance and damage tolerance of composite laminates. © 2023 International Committee on Composite materials. All rights reserved.

关键词： Damage tolerance

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Transforming organic chemistry research paradigms:Moving from manual efforts to the intersection of automation and artificial intelligence

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National science Open 2024年第2期3卷 98-127页

作者： Chengchun Liu Yuntian Chen Fanyang Mo School of Materials Science and Engineering Peking UniversityBeijing 100871China Ningbo Institute of Digital Twin Eastern Institute of TechnologyNingbo 315000China AI for Science(AI4S)-Preferred Program Peking University Shenzhen Graduate SchoolShenzhen 518055China

Organic chemistry is undergoing a major paradigm shift,moving from a labor-intensive approach to a new era dominated by automation and artificial intelligence(AI).This transformative shift is being driven by technological advances,the ever-increasing demand for greater research efficiency and accuracy,and the burgeoning growth of interdisciplinary *** models,supported by computational power and algorithms,are drastically reshaping synthetic planning and introducing groundbreaking ways to tackle complex molecular *** addition,autonomous robotic systems are rapidly accelerating the pace of discovery by performing tedious tasks with unprecedented speed and *** article examines the multiple opportunities and challenges presented by this paradigm shift and explores its far-reaching *** provides valuable insights into the future trajectory of organic chemistry research,which is increasingly defined by the synergistic interaction of automation and AI.

关键词： organic chemistry automation platform artificial intelligence algorithms

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Low-temperature spin Seebeck effect in nonmagnetic vanadium dioxide

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Physical Review B 2024年第2期110卷 024415-024415页

作者： Renjie Luo Tanner J. Legvold Liyang Chen Henry Navarro Ali C. Basaran Deshun Hong Changjiang Liu Anand Bhattacharya Ivan K. Schuller Douglas Natelson Department of Physics and Astronomy Applied Physics Graduate Program Rice Quantum Institute Department of Physics and Center for Advanced Nanoscience Materials Science Division Department of Electrical and Computer Engineering Department of Materials Science and NanoEngineering

The spin Seebeck effect (SSE) is sensitive to thermally driven magnetic excitations in magnetic insulators. Vanadium dioxide in its insulating low-temperature phase is expected to lack magnetic degrees of freedom, as vanadium atoms are thought to form singlets upon dimerization of the vanadium chains. Instead, we find a paramagnetic SSE response in VO2 films that grows as the temperature decreases below 50 K. The field and temperature-dependent SSE voltage is qualitatively consistent with a general model of paramagnetic SSE response and inconsistent with triplet spin transport. Quantitative estimates find a spin Seebeck coefficient comparable in magnitude to that observed in strongly magnetic materials. The microscopic nature of the magnetic excitations in VO2 requires further examination.

关键词： Spin Seebeck effect Paramagnets Strongly correlated systems

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Self-Attenuating Graphene-Based Antennas Utilizing Polyvinylidene Fluoride (PVDF) Substrates

Self-Attenuating Graphene-Based Antennas Utilizing Polyvinyl...

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Microwave and Antenna Symposium (IMAS), International

作者： Josef Frankhouse Evans Addo-Mensah Uche Wejinya Department of Mechanical Engineering University of Arkansas - Fayetteville Materials Science and Engineering Graduate Program University of Arkansas - Fayetteville

ISBN: (数字)9798350356359

ISBN: (纸本)9798350356366

In this study, a Terahertz (THz) band antenna which can regulate its own resonant frequency without the requirement of manual adjustment is simulated. A polyvinylidene fluoride (PVDF) substrate is applied onto a rectangular graphene patch antenna. With a voltage potential applied onto the PVDF, the patch antenna can attenuate its frequency by physically changing the shape of the antenna, and in turn its resonant frequency. These antennas are within a 0.1 THz band between 1.32 THz to 1.22 THz measured from a radial bend of a flat surface to r = 75 μm, fitting into a return loss (S11) above -30 dB. Although the return loss did not show consistency, the resonating frequency shifted at a linear rate relative to the cylindrical bending.

关键词： Microwave antennas Patch antennas Graphene Resonant frequency Prototypes Bandwidth Bending Loss measurement Substrates Terahertz communications

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