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 |
相關次數: | 點閱:136 下載:0 |
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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。
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