研究生: |
黃繹蓁 |
---|---|
論文名稱: |
鐵磁薄膜居禮溫度變動的研究 |
指導教授: | 沈青嵩 |
學位類別: |
碩士 Master |
系所名稱: |
物理學系 Department of Physics |
論文出版年: | 2005 |
畢業學年度: | 93 |
語文別: | 中文 |
論文頁數: | 107 |
中文關鍵詞: | 居禮溫度 、磁性 |
英文關鍵詞: | curie temperature |
論文種類: | 學術論文 |
相關次數: | 點閱:242 下載:12 |
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摘要
我們以磁光柯爾效應儀(SMOKE)對超薄膜進行磁性的探討,由實驗室之前的研究以經知道1 ML Co / Pt (111)、 2 ML Co / Pt (111)、1 ML Co / 1 ML Ni / Pt (111)、1 ML Ni / 1 ML Co / Pt (111)這四種樣品的結構與磁性變化,而我們實驗主要的研究課題為,這四種樣品在不同的退火溫度下,其居禮溫度的變動為何?
1 ML Co / Pt (111)、 2 ML Co / Pt (111)這兩樣品,隨著溫度的升高因為Co、Pt原子d軌道電子混雜與Co-Pt合金的形成,造成垂直磁異向性增強的現象。
我們發現這四種樣品在不同的溫度退火20分鐘後,其居禮溫度皆隨著溫度的升高而降低,而且隨著樣品厚度的增加,相對應的居禮溫度也較高。這四種樣品在經過升溫退火效應後,因為合金的形成,使得其磁性與未升溫前的樣品不相同。另外我們也發現這四種樣品在不同溫度退火20分鐘後,在將溫的過程中,其矯頑磁場與樣品溫度的關係曲線有一特殊的趨勢,也就是Hc隨著溫度有階梯狀現象的下降。
由實驗室之前的研究,我們知道1 ML Co / Pt (111)樣品易軸方向為垂直樣品表面,而Ni原子鍍在Pt(111)上時在4 ML以內是測不出磁滯曲線的,也就是說這兩種原子鍍在Pt (111)上因為介面的不同所以磁性也不相同,1 ML Ni / 1 ML Co / Pt (111)樣品因為與基底接觸的介面為Co原子,所以剛準備好樣品時可以測量到磁性,甚至因為鍍了1 ML的Ni造成磁性比1 ML Co / Pt (111)樣品還強的現象,而1 ML Co / 1 ML Ni / Pt (111)樣品與基底接觸的介面為Ni原子,所以樣品的磁性受到Ni原子主導,剛準備好的樣品是測不出磁性的,雖然Co、Ni原子皆在相同的溫度先混合,也在相同的溫度往Pt基底擴散,但是由我們的實驗結果卻發現,這兩樣品在相同的退火溫度下,因為Co原子喜歡和Pt原子接觸在一起,所以兩樣品中Co、Ni原子行為不同造成其居禮溫度的差異。
由以上磁性與居禮溫度的測量,我們知道Co、Ni原子對磁性造成的影響,而樣品隨著退火溫度的改變其居禮溫度的變化,希望對於磁光記憶材料的研究有很大的幫助。
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