研究生: |
蘇泰廷 Su, Tai-Ting |
---|---|
論文名稱: |
電子束蒸鍍形成L10-[Fe(1.4nm)/Pd(1.9nm)]5 多層膜的磁性質與微結構之研究 The study of the microstructure and magnetic properties in L10 [Fe(1.4nm)/Pd(1.9nm)]5 multilayer system |
指導教授: |
歐陽浩
Ouyang, Hao |
口試委員: |
邱顯浩
孫安正 |
學位類別: |
碩士 Master |
系所名稱: |
工學院 - 材料科學工程學系 Materials Science and Engineering |
論文出版年: | 2011 |
畢業學年度: | 99 |
語文別: | 中文 |
論文頁數: | 110 |
中文關鍵詞: | 矯頑磁場 、L10 |
相關次數: | 點閱:2 下載:0 |
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FePt的部分
藉由濺鍍鐵白金和鋨的多層膜系統中,鋨的熔點和沸點對序化程度有很大的影響,鋨和鐵白金的晶格匹配在鐵白金的多層膜系統中能夠造成相當大的應變,可以經由高解析穿透式電子顯微鏡和立面薄膜繞射的分析而得到。在有序無序的相變化中,此巨大的應變沿c軸進行,可以強化L10鐵白金序化程度。此外,當FePt的厚度與鋨的比例較低時,應變被釋放,平均的應變將變小以至於序化參數減小,必須用較高的退火溫度去形成序化鐵白金的結構。
FePd的部分
利用電子束蒸鍍鐵鈀多層膜系統[Fe(1.4nm)/Pd(1.9nm)]5,在不同蒸鍍溫度下,比較高溫600℃和150℃的微結構和磁性質。我們選用單晶(001)的氧化鎂當基板,因為他有良好的結晶性和平整度,可以使鐵鈀多層膜延氧化鎂上的(001)方向成長,值得一提的是介面處有約10%的晶格匹配,利用氧化鎂和鐵鈀的晶格不匹配來誘發相變化,高溫則是有足夠能量克服熱活化能促使相變化,並且利用氧化鎂單晶(001)的方向,使鐵鈀的C軸可以沿此方向成長。沉積溫度在600℃與JCPDS卡上FePd(200)方向上有交錯,表示高溫蒸鍍情況漸漸使鐵和鈀混合,出現(200)方向的鋒值,有機會出現較多的序化結構,比起低溫蒸鍍的結果,矯頑磁場略高一些。但由高解析穿透式電子顯微鏡上顯示,混和明顯不夠均勻,故預期下次實驗會提高真空度,減少對鍍率的影響,並降低蒸鍍速率,希望使鐵和鈀元素混合更均勻。
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