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姓名 李鎮宇(Chen-Yu Lee) 查詢紙本館藏 畢業系所 物理學系 論文名稱 錫鎳奈米核殼結構的法拉第磁感應探討 相關論文 檔案 [Endnote RIS 格式]
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摘要(中) 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。摘要(英) 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.關鍵字(中) ★ 錫鎳奈米
★ 法拉第磁感應
★ 磁性鬆弛
★ 弛豫現象關鍵字(英) 論文目次 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..................................................................................................... 59參考文獻 〔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
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Phys. Rev. B, 80, 174423, 2009.指導教授 李文献 審核日期 2016-7-5 推文 plurk
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