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收集所有交通大學研究人員與學生個人或團體所發表之各項學術著作，涵蓋期刊論文、教師專書、學位論文等項。;;Collections of Publications of NCTU Researchers and Students Like Journal Papers and Thesis.

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Now showing 1 - 5 of 5
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    Ultrafast Giant Photostriction of Epitaxial Strontium Iridate Film with Superior Endurance
    (2018-12-01)
    Yang, Jan-Chi
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    Liou, Yi-De
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    Tzeng, Wen-Yen
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    Liu, Heng-Jui
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    Chang, Yao-Wen
    Photostriction, optical stimulus driven mechanical deformation in materials, provides a solution toward next-generation technology. Here, the giant photostriction (similar to 2% change of lattice) of epitaxial strontium iridate (SrIrO3) films under illumination at room temperature is revealed via power-dependent Raman scattering, which is significantly larger as compared to conventional inorganic materials. The time scale and mechanism of this giant photostriction in SrIrO3 are further studied through time-resolved transient reflectivity measurements. The main mechanism is determined to be the electron-phonon coupling. In addition, we find that such an exotic behavior happens within few picoseconds and remains up to 107 cyclic on/off operations. The observation of giant photostriction in SrIrO3 films with superior endurance promises the advance of shape responsive solids that are sensitive to environmental stimuli, which could be widely utilized for multifunctional optoelectronics and optomechanical devices.
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    BiFeO3 Thin Films: A Playground for Exploring Electric-Field Control of Multifunctionalities
    (2015-01-01)
    Yang, Jan-Chi
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    He, Qing
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    Yu, Pu
    ;
    Chu, Ying-Hao
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    材料科學與工程學系
    A promising approach to the next generation of low-power, functional, and green nanoelectronics relies on advances in the electric-field control of lattice, charge, orbital, and spin degrees of freedom in novel materials. The possibility of electric-field control of these multiple materials functionalities offers interesting options across a range of modern technologies, including information communication, computing processes, data storage, active components, and functional electronics. This article reviews electric-field control and modulation of various degrees of freedom through the medium of multiferroic BiFeO3. Coexisting order parameters and inherent couplings in this materials system form a potent playground, enabling direct and indirect manipulation to obtain intriguing properties and functionalities with an electric stimulus. An in-depth understanding of those electrically controlled phenomena and breakthroughs is highlighted, paving a new route toward multifunctional nanoelectronics. This article concludes with a brief discussion on foreseeable challenges as well as future directions.
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    Magnetic Mesocrystal-Assisted Magnetoresistance in Manganite
    (2014-11-01)
    Yang, Jan-Chi
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    He, Qing
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    Zhu, Yuan-Min
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    Lin, Jheng-Cyuan
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    Liu, Heng-Jui
    Mesocrystal, a new class of crystals as compared to conventional and well-known single crystals and polycrystalline systems, has captured significant attention in the past decade. Recent studies have been focused on the advance of synthesis mechanisms as well as the potential on device applications. In order to create further opportunities upon functional mesocrystals, we fabricated a self-assembled nanocomposite composed of magnetic CoFe2O4 mesocrystal in Sr-doped manganites. This combination exhibits intriguing structural and magnetic tunabilities. Furthermore, the antiferromagnetic coupling of the mesocrystal and matrix has induced an additional magnetic perturbation to spin-polarized electrons, resulting in a significantly enhanced magnetoresistance in the nanocomposite. Our work demonstrates a new thought toward the enhancement of intrinsic functionalities assisted by mesocrystals and advanced design of novel mesocrystal-embedded nanocomposites.
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    新穎材料開發計畫---強化雷射分子束氧化物磊晶平台
    (2010)
    朱英豪
    ;
    Chu Ying-Hao
    ;
    國立交通大學材料科學與工程學系（所）
    氧化物材料具有多樣之結構特性，可以形成簡單之二元氧化物， 亦可形成複雜之多元氧化物，同時包含許多特殊之優良性質，舉 凡超導特性、巨磁阻特性、焦電、壓電、介電、半導、導電、磁 性、光性等，幾乎包含所有物理性質。氧化物電子目前正蓬勃之 發展，為下一個世代之電子元件提供另一種解決方案。 本計劃第一年已獲補助建立雷射分子束磊晶，可以快速大幅提升 我國學界與業界在氧化物磊晶研發之實力。計劃要建立之系統雷 射分子束磊晶平台，將具有高工作氣壓之RHEED來進行臨場薄膜 之成長，這樣的系統可以提供氧化物磊晶薄膜技術龐大之資料 庫。此一磊晶成長平台之建立，可以快速提昇我國於氧化物磊晶 成長之基礎能力，可以繼續利用此平台研發新穎與新功能之材 料。高品質之材料為固態物理研究之基石，此平台建立後，已經 為以量測為主之研究群，提供樣品確保其樣品之品質。另外對於 成長氧化物磊晶有興趣之研究群，這樣的平台提供共同研發之機 會，可以藉由計畫主持人長期之經驗，快速的建立起新製程，以 利其他研究群材料之快速開發。 第二年將計畫延伸此平台之完整 性與功能性，在此系統上增加高真空掃描系統，此系統除了可以 解決目前成長系統研發速度受限之缺點，亦可提供另一個快速與 安全平台，可以讓成長我之高品質磊晶薄膜立即進行特性之量 測，此兩部分將相輔相成，可以將我國氧化物磊晶之技術更往前 邁進一步，此系統將成為國內成長氧化物薄膜之模範平台，可以 厚植本國在此領域研發之能力。此一平台亦提供業界快速取得多 功能與高品質之氧化物磊晶，有助於縮短業界開發新製程與元件 之研發時間，同時間由於各種氧化物搭配，亦可由此一平台提供， 亦可提供業界元件製程與整合所遇到困難之解決方案。 目前使用者眾多，系統無法兼顧新穎材料之開發與提供平台合作 對象高品質之樣品，因此希望今年可以強化平台的功能，建立第 二套系統，以利開發和合作同時進行，同時也降低系統損壞維修 之風險。第二套之系統亦可為將來與同步輻射結合之開發分析系 統做準備。
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    Interface control of bulk ferroelectric polarization
    (2012-06-19)
    Yu, P.
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    Luo, W.
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    Yi, D.
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    Zhang, J. X.
    ;
    Rossell, M. D.
    The control of material interfaces at the atomic level has led to novel interfacial properties and functionalities. In particular, the study of polar discontinuities at interfaces between complex oxides lies at the frontier of modern condensed matter research. Here we employ a combination of experimental measurements and theoretical calculations to demonstrate the control of a bulk property, namely ferroelectric polarization, of a heteroepitaxial bilayer by precise atomic-scale interface engineering. More specifically, the control is achieved by exploiting the interfacial valence mismatch to influence the electrostatic potential step across the interface, which manifests itself as the biased-voltage in ferroelectric hysteresis loops and determines the ferroelectric state. A broad study of diverse systems comprising different ferroelectrics and conducting perovskite underlayers extends the generality of this phenomenon.