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研究生:蔡仲威
研究生(外文):Tsai,Chungwei
論文名稱(外文):Alignment of Ferromagnetic Spins and Antiferromagnetic Spins in CoxNi1-x/Cu(001) by Photoemission Electron Microscopy
指導教授:潘瑋潘瑋引用關係
指導教授(外文):Pan,Wei
口試委員:陳昭翰陳建易
口試委員(外文):Chen,JauhanChen,Jianyi
口試日期:2012-06-28
學位類別:碩士
校院名稱:國立中正大學
系所名稱:物理學系暨研究所
學門:自然科學學門
學類:物理學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:71
外文關鍵詞:Photoemission Electron Microscopy
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The magnetic properties of a film of CoxNi1-xO/CoxNi1-x/Cu(001) were investigated by using Magneto-Optical Kerr Effect (MOKE) , Photoemission Electron Microscopy (PEEM) at different temperature. The film was deposited by thermal evaporation of 11 ML CoxNi1-x on Cu(001) substrate in an ultrahigh vacuum (UHV) chamber with a base pressure of 5×10-10 mbar and followed by oxygen exposure for 1800 Langmuir (L) . The growth of the film was monitored by using Medium-Energy Electron Diffraction (MEED) . The structure was resolved by using Low Energy Electron Diffraction (LEED) and IV-LEED. The surface oxide was confirmed by X-ray Absorption Spectroscopy (XAS) , where the peaks indicating CoxNi1-x O were found. Below the antiferromagnetic Néel temperature (TN) of the CoxNi1-xO, the coercivity of the film dramatically increases owing to the Antiferromagnet/Ferromagnet (AF/FM) coupling. From the PEEM images and use Image J to analysis sample, it is found that the most FM of CoxNi1-x aligning along the perpendicular direction and canting direction driven by the perpendicular CoxNi1-xO AF. Additionally, the films are protected by the surface oxide and can magnetically alive under the pressure of atmosphere. Thus, we successfully generate a film with perpendicular magnetic anisotropy that functions at the ambient condition. It might be applied for the spintronic devices.
第一章 緒論 1
第二章 基本概念 3
2-1薄膜成長理論 3
2-2表面晶格 4
2-3磁的簡介 5
2-4磁滯曲線理論模型 6
2-4-1鐵磁磁滯曲線近似 7
2-4-2反鐵磁/鐵磁的軟性交換偏耦合 (soft exchange bias) 8
2-4-3反鐵磁/鐵磁的硬性交換偏耦合 (hard exchange bias) 8
2-7 X光磁圓偏振二向色性 (X-ray magnetic circular dichroism, XMCD) 11
2-8 X光磁線偏振二向色性 (X-ray magnetic linear dichroism, XMLD) 12
第三章 實驗設備與流程 14
3-1 Overview 14
3-2超高真空系統 16
3-2-1 真空下的壓力的基本概念 16
3-3低能電子繞射 (Low Energy Electron Diffraction, LEED) 17
3-3-1 LEED-I(E) 的應用 20
3-4中能電子繞射 (medium Energy Electron Diffraction, MEED) 22
3-5磁光柯爾效應(Magneto-optic Kerr effect, MOKE) 23
3-6殘餘的氣體分析儀 (Residual Gas Analyzer, RGA) 25
3-7樣品的準備 25
3-8影像式光電子顯微術 (photoemission electron microscopy, PEEM) 26
3-8-1鐵磁磁區的XMCD-PEEM影像 28
3-8-2反鐵磁磁區的XMLD-PEEM影像 29
第四章 結果與討論 31
4-1 基板Cu(001) 的清潔及重整 31
4-2 磁性超薄膜的成長 [CoxNi1-x/Cu(001)] 33
4-3 CoxNi1-x/Cu(001) 的成長結構 34
4-4 CoxNi1-x /Cu(001) 的磁性狀態 36
4-5 在CoxNi1-x /Cu(001) 上添加反鐵磁層和保護層 36
4-6 CoxNi1-x O/ CoxNi1-x /Cu(001) 的磁性隨溫度的關係 40
4-7 Cu(001), CoxNi1-x /Cu(001), CoxNi1-x O/ CoxNi1-x /Cu(001)的原子層間距 44
4-8 CoxNi1-x O/ CoxNi1-x /Cu(001) 的磁區探討 46
4-8-1 CoxNi1-x O/ CoxNi1-x /Cu(001) 的反鐵磁層探討 46
4-8-2 CoxNi1-x O/ CoxNi1-x /Cu(001) 的鐵磁層探討 49
4-8-3 CoxNi1-x O/ CoxNi1-x /Cu(001) 鐵磁層磁區數據化 54
第五章 結論 57
第六章 參考文獻 58

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