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研究生： 蔡承叡
Cheng-Jui Tsai
論文名稱： 鈷薄膜成長於鎢(111)與皺化鎢{112}上的晶體結構與磁性研究
Growth, Structure and Magnetism in Co/W(111) and Co/Faceted Pd/W{112}
指導教授： 林文欽
Lin, Wen-Chin
宋克嘉
Song, Ker-Jar
學位類別： 碩士
Master
系所名稱： 物理學系
Department of Physics
論文出版年： 2009
畢業學年度： 97
語文別： 英文
論文頁數： 70
中文關鍵詞： 皺化 、磁性 、晶體結構 、溫控熱脫附 、磁光科爾效應 、歐階電子能譜儀
英文關鍵詞： faceted, magnetism, crystalline structure, TPD, MOKE, AES
論文種類： 學術論文
相關次數： 點閱：78  下載：6 
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    The crystalline structure and magnetism of Co/W(111) and Co/faceted
    Pd/Wf112g surface are studied with low energy electron di raction
    (LEED), Auger electron spectroscopy (AES), temperature programmed
    thermal desorption (TPD) and magneto-optical Kerr e ect (MOKE).
    We nd that Co/W(111) has revealed in-plane ferromagnetic ordered
    for room temperature growth mode and both of in-plane and perpen-
    dicular magnetism for low temperature growth mode. Co undergo well
    epitaxial on W(111) because of the small lattice mismatch in a speci c
    orientaion. Co/faceted Pd/Wf112g reveals two-step hysteresis loops
    and we infer that alloys are formed. There is 40 Oe reduction in
    the magnetic coercivity of Co/faceted Pd/Wf112g when 1.8 langmuir
    hydrogen is dosed with 1.8 Langmuir.

    1 Introduction 2 1.1 Basic properties about W(111) substrate . . . . . . . . 2 1.2 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . 9 2 Introduction to Basic Concepts of the UHV System 11 2.1 Why Should We Need UHV . . . . . . . . . . . . . . . 11 2.2 Gas Release from Solids . . . . . . . . . . . . . . . . . 13 2.2.1 Di usion . . . . . . . . . . . . . . . . . . . . . . 14 2.2.2 Vaporization . . . . . . . . . . . . . . . . . . . . 15 2.2.3 Leaks . . . . . . . . . . . . . . . . . . . . . . . 15 2.2.4 Desorption . . . . . . . . . . . . . . . . . . . . . 16 2.2.5 Permeation . . . . . . . . . . . . . . . . . . . . 21 2.2.6 Backstreaming . . . . . . . . . . . . . . . . . . 22 2.3 How Could We Get UHV . . . . . . . . . . . . . . . . . 22 3 Introduction to Experimental Instruments 25 3.1 Pumping Systems . . . . . . . . . . . . . . . . . . . . . 26 3.1.1 Mechanical Pump . . . . . . . . . . . . . . . . . 26 3.1.2 Turbo Molecular Pump . . . . . . . . . . . . . . 27 3.1.3 Titanium Sublimation Pump . . . . . . . . . . . 28 3.1.4 Ion Pump . . . . . . . . . . . . . . . . . . . . . 28 3.2 Measurement Instruments . . . . . . . . . . . . . . . . 30 3.2.1 Auger Electron Spectroscopy . . . . . . . . . . . 30 3.2.2 Low Energy Electron Di raction . . . . . . . . . 31 3.2.3 Magneto-Optical Kerr E ect . . . . . . . . . . . 37 4 Experimental Results and Discussion 42 4.1 Experimental Method . . . . . . . . . . . . . . . . . . . 42 4.2 Thickness Calibration of Co Films . . . . . . . . . . . . 44 4.3 Structure I : Co/W(111) . . . . . . . . . . . . . . . . . 48 4.3.1 Low Temperature Growth of Co on W(111) . . 48 4.3.2 Room Temperature Growth of Co on W(111) . 51 4.3.3 Discussion of in-Plane Crystalline Structure of Co/W(111) . . . . . . . . . . . . . . . . . . . . 54 4.4 Magnetism I : Co/W(111) . . . . . . . . . . . . . . . . 56 4.4.1 RT Growth of Co/W(111) . . . . . . . . . . . . 56 4.4.2 LT Growth of Co/W(111) . . . . . . . . . . . . 57 4.5 Structure and Magnetism II : Co/faced Pd/Wf112g . . 59 4.5.1 LT Growth of Co/faced Pd/Wf112g . . . . . . 59 4.5.2 Hydrogen E ect on Co/faceted Pd/Wf112g . . 65 5 Conclusion 67 Bibliography 68

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