English  |  正體中文  |  简体中文  |  Items with full text/Total items : 65421/65421 (100%)
Visitors : 22283493      Online Users : 244
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version


    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
    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.
    Appears in Collections:[物理研究所] 博碩士論文

    Files in This Item:

    File Description SizeFormat
    index.html0KbHTML215View/Open


    All items in NCUIR are protected by copyright, with all rights reserved.

    社群 sharing

    ::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback  - 隱私權政策聲明