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研究生: 劉書豪
Liu, Shu-Hao
論文名稱: 坡莫合金次微米圓點陣列之鐵磁共振溫度相依研究
Investigation of Temperature Dependent Ferromagnetic Resonance in Arrays of Submicron Permalloy Dots
指導教授: 江佩勳
Jiang, Pei-hsun
學位類別: 碩士
Master
系所名稱: 物理學系
Department of Physics
論文出版年: 2020
畢業學年度: 108
語文別: 中文
論文頁數: 59
中文關鍵詞: 鐵磁共振磁振子晶格
DOI URL: http://doi.org/10.6345/NTNU202000449
論文種類: 學術論文
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  • 常見的鐵磁共振實驗通常採用薄膜結構的鐵磁性材料,而週期性結構的鐵磁性材料在鐵磁共振實驗中有其它的吸收峰值,因此我們製作了四種樣品,其中包含一種薄膜結構、三種陣列結構,比較其實驗差異。
      將每一個樣品降溫至1.5 K,並且在不同溫度下量測微波訊號與掃磁場的關係,推算出四個主要的參數:α Gilbert阻尼參數、∆H0不均勻線寬、Ms飽和磁化、Hk異向性磁場,即可歸納出每個參數與溫度的關係。
      圓點的直徑與間距會影響磁化動力學,導致進動循環的時間有差異。藉由實驗結果可以評論,選擇不同規格的樣品需考量能量上的損耗或是微波訊號上的雜訊。

    摘要 i 第一章 研究目標 1 1.1 簡介 1 1.2 進動阻尼係數 2 1.3 週期性結構的鐵磁性材料 4 1.4 低溫物理 6 1.5 自旋波 6 1.5.1 向前體積靜磁自旋波模式 7 1.5.2 向後體積靜磁自旋波模式 8 1.5.3 靜磁平面自旋波模式 10 1.6 磁振子晶格的額外吸收峰值 11 1.7 阻尼值與溫度的相依性 12 第二章 磁化的基礎理論 14 2.1 磁性材料 14 2.1.1 反磁性 14 2.1.2 順磁性 14 2.1.3 鐵磁性 15 2.2 磁域 15 2.3 磁異向性 17 2.4 磁矩與角動量 18 2.5 自旋電子的進動頻率 20 2.6 鐵磁共振 21 2.6.1 Landau-Lifshitz-Gilbert equation 21 2.6.2 微波吸收峰值的半高寬 22 2.6.3 共振頻率 23 第三章 實驗儀器介紹與樣品製作流程 25 3.1 共平面波導 25 3.2 電子束微影 26 3.2.1 繪圖 26 3.2.2 旋轉塗佈 27 3.2.3 掃描電子顯微鏡 28 3.2.4 曝光參數計算 31 3.2.5 曝光 34 3.2.6 顯影 34 3.2.7 蒸鍍 35 3.2.8 舉離 35 3.3 電子束蒸鍍 36 3.4 致冷機 38 3.5 向量網路分析儀 40 第四章 實驗結果與討論 41 4.1 FMR訊號之量測 41 4.2 阻尼值與不均勻線寬的量測 42 4.3 阻尼值與溫度的關係 44 4.4 不均勻線寬與溫度的關係 45 4.5 飽和磁化與異向性磁場的量測 45 4.6 飽和磁化與溫度的關係 46 4.7 異向性磁場與溫度的關係 47 4.8 未來展望 48 4.8.1 額外的吸收峰值 48 4.8.2 產生不均勻線寬的其它原因 50 4.8.3 重新設計CPW 52 4.9 結論 53 參考文獻 54

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