跳到主要內容

簡易檢索 / 詳目顯示

研究生: 李鎮宇
Chen-Yu Lee
論文名稱: 錫鎳奈米核殼結構的法拉第磁感應探討
指導教授: 李文献
口試委員:
學位類別: 碩士
Master
系所名稱: 理學院 - 物理學系
Department of Physics
論文出版年: 2016
畢業學年度: 104
語文別: 中文
論文頁數: 72
中文關鍵詞: 錫鎳奈米法拉第磁感應磁性鬆弛弛豫現象
相關次數: 點閱:14下載:0
分享至:
查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報
  • 本篇論文討論 Sn@Ni 核殼結構奈米顆粒的磁性、超導研究與磁性
    鬆弛行為,使用熱蒸鍍冷凝法的雙鍍源方式製作本樣品,經由 X 光繞
    射譜圖、EDXS與 TEM判定 Sn核直徑為2.4 nm,Ni殼的厚度為 1.9 nm。
    Sn@Ni 在外加磁場 Ha = 200 Oe 的阻擋溫度 TB = 43 K, ;Ha = 1 kOe
    ,TB = 6 K;Ha = 5 kOe,TB = 2.4 K。對其做磁化率隨著溫度變化的實
    驗,可發現 Sn@Ni 具有弱自旋玻璃行為與超導臨界磁場 Hc0 = 2.9
    kOe。
    Sn@Ni 奈米顆粒磁性鬆弛研究具有磁化強度翻轉的行為,此行為
    可得知與本樣品為核殼結構有關。磁化強度隨時間鬆弛的曲線,應有
    兩個分量的貢獻,分別是殘留的磁化強度 Mr 曲線和感應的磁化強度
    Mi曲線。弛豫現象與溫度、外加磁場、降場速率有關。
    最後將 Sn@Ni 與本實驗室的 Au@Ni 做個比較,可得知 Sn@Ni 感
    應的磁化強度百分比 Pi0比 Au@Ni 的來的強。


    We report on the magnetic properties, superconductivity and magnetic relaxation
    behaviors in the nano-sized Sn@Ni core@shell particles. The Sn@Ni NPs were
    fabricated employing the gas-condensation method, using a chamber equipped with two
    decoupled evaporation sources for separate evaporation of Sn or Ni. We use X-ray
    diffraction pattern, energy-dispersive X-ray spectroscopy and transmission electron
    microscopy, resulting in a mean particle core diameter of 2.4 nm and shell thickness of
    1.9 nm.
    In applied magnetic field Ha = 200 Oe, the blocking temperature TB of Sn@Ni is 43
    K; Ha = 1 kOe, TB = 6 K; Ha = 5 kOe, TB = 2.4 K. Doing χ(T) experiment, Sn@Ni has
    weak spin glass behavior and the critical magnetic field Hc0 = 2.9 kOe.
    The study of magnetic relaxation behaviors of Sn@Ni NPs had inverse magnetization
    behavior. It related to core@shell structure and it depended on temperature, applied
    magnetic field, and turning the Ha off. M(t) should have two components: remanent
    magnetization Mr and Faraday inductive magnetization Mi.
    At last, we made a comparison between Sn@Ni and Au@Ni. The ratio of Faraday
    inductive magnetization Pi0 of Sn@Ni had much stronger than Au@Ni.

    論文摘要........................................................................................................ i Abstract .........................................................................................................ii 致謝..............................................................................................................iii 目錄..............................................................................................................iv 圖目錄..........................................................................................................vi 第一章 簡介................................................................................................. 1 1.1 緒論................................................................................................ 1 1.2 錫與鎳的物理性質介紹................................................................ 2 1.3 實驗動機........................................................................................ 4 第二章 實驗儀器與樣品粒徑分析............................................................. 5 2.1 奈米顆粒的製備............................................................................. 5 2.2 X 光繞射原理介紹......................................................................... 7 2.3 核殼結構與粒徑分析..................................................................... 9 2.4 物理特性量測系統介紹............................................................... 13 第三章 Sn@Ni 奈米顆粒的磁性與超導現象.......................................... 15 3.1 阻擋溫度...................................................................................... 15 3.2 外加頻率對磁化率的影響.......................................................... 17 3.3 外加磁場對超導溫度的影響...................................................... 20 第四章 Sn@Ni 奈米顆粒的磁性鬆弛行為與擬合分析.......................... 24 v 4.1 磁性鬆弛現象.............................................................................. 24 4.2 描述擬合曲線............................................................................... 29 4.3 低磁場降溫後的磁性鬆弛行為與擬合分析 .............................. 33 4.4 中磁場降溫後的磁性鬆弛行為與擬合分析 .............................. 39 4.5 高磁場降溫後的磁性鬆弛行為與擬合分析 .............................. 45 4.6 外加磁場對磁性鬆弛的影響...................................................... 51 4.7 降場速率對磁性鬆弛的影響...................................................... 54 第五章 結論............................................................................................... 57 參考文獻..................................................................................................... 59

    〔1〕 李其紘,氧化殼層對於錫奈米顆粒超導性與自旋極化的影響,中
    央大學碩士論文
    〔2〕 Dehaas, W et al., The electrical resistance of cadmium, thallium and
    tin at low temperatures. Physica. 1935, 2
    〔3〕 David R. Lide, Handbook of Chemical and Physics, CRC, 76th,
    1995-1996
    〔4〕 Chen-Chen Kuo, Chi-Yen Li, Chi-Hung Lee, Hsiao-Chi Li,
    Wen-Hisen Li, Int J Mol Sci. 2015 doi: 10.3390/ijms160920139
    〔5〕 吳勝允、李文獻,“奈米銀微粒的非線性磁激發”, 物理雙月刊 廿
    八卷五期,(2006)
    〔6〕 許樹恩、吳泰伯,X 光繞射原理與材料結構分析。
    〔7〕 D. K. Kim, Y. Zhang, J. Kehr, T. Klason, B. Bjelke, M. Muhammed,
    “Characterization and MRI study of surfactant-coated superparamag
    -netic nanoparticles administered into the rat brain ”, Journal of
    Magnetism and Magnetic Materials, 225, 256–261, 2001.
    〔8〕 K. H. Fischer, John Hertz. Spin glasses. Cambridge University Press.
    1993. ISBN 9780521447775
    〔9〕 郭蓁蓁,金鎳奈米核殼結構的巨觀法拉第感應及磁性鬆弛研究,
    中央大學碩士論文
    〔10〕 Shengqiang Zhou, Artem Shalimov, Kay Potzger, Manfred Helm,
    Jürgen Fassbender, and Heidemarie Schmidt, “MnSi1.7 nanoparticles
    embedded in Si: Superparamagnetism with collective behavior ”,
    Phys. Rev. B, 80, 174423, 2009.

    QR CODE
    :::