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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/71662

    Title: 錫鎳奈米核殼結構的法拉第磁感應探討
    Authors: 李鎮宇;Lee,Chen-Yu
    Contributors: 物理學系
    Keywords: 錫鎳奈米;法拉第磁感應;磁性鬆弛;弛豫現象
    Date: 2016-07-05
    Issue Date: 2016-10-13 13:28:43 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 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
    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
    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
    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.
    Appears in Collections:[物理研究所] 博碩士論文

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