研究生: |
郭明憲 Ming-Hsien Kuo |
---|---|
論文名稱: |
銀覆蓋層對鐵超薄膜在鉑(111)上的磁性影響 |
指導教授: |
沈青嵩
Shern, Ching-Song |
學位類別: |
碩士 Master |
系所名稱: |
物理學系 Department of Physics |
論文出版年: | 2007 |
畢業學年度: | 95 |
語文別: | 中文 |
論文頁數: | 93 |
中文關鍵詞: | 歐傑電子能譜儀 、磁光柯爾效應儀 、鐵 、銀 、鉑(111) 、矯頑力 |
英文關鍵詞: | Auger electron spectroscopy (AES), magneto-optical Kerr effect (MOKE), Iron, Fe, Silver, Ag, Platinum, Pt(111), coercivity |
論文種類: | 學術論文 |
相關次數: | 點閱:159 下載:9 |
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我們以自製的磁光柯爾效應儀(MOKE)探測Ag超薄膜覆蓋於Fe/Pt(111)樣品前後之表面磁性變化,並藉由歐傑電子能譜術(AES) 鑑別樣品表面組成成分、計算薄膜厚度,以及低能量繞射電子儀 (LEED)研究表面結構,利用升降溫系統與離子濺射進行退火效應與深度分析的實驗。
經由在1~3ML Fe/Pt(111)上逐漸覆蓋不同厚度的銀,發現Polar方向的磁性有增強,而Longitudinal方向有減弱的現象,且在Ag覆蓋達1ML之後就無太大變化。藉由離子濺射的過程,觀察磁性及歐傑訊號強度的變化,確認磁性改變的原因來自於Ag-Fe界面效應的作用。
將1ML Ag/1ML Fe/Pt(111)經由不同溫度的退火處理之後,在室溫量測其磁性與歐傑訊號,發現在低於600 K的退火溫度時,由於Fe原子與Pt原子的交換減弱了Ag-Fe介面引致PMA的作用,使得Polar方向的磁性慢慢消失。在退火溫度介於600 K~700 K之間時,由於Fe跟Pt開始形成合金,使得Polar與Longitudinal方向的柯爾訊號及Hc大幅的增加。當退火溫度超過700 K時,由於Fe原子往下擴散到更底層去而Pt原子往上浮出,以及Ag原子逐漸的退吸附,使得Ag-Fe介面的效應變得更弱,導致Polar方向及Longitudinal方向的磁性逐漸消失。
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