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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 林敏聰(Minn-Tsong Lin) | |
dc.contributor.author | Chun0I Lu | en |
dc.contributor.author | 呂俊毅 | zh_TW |
dc.date.accessioned | 2021-06-08T04:44:47Z | - |
dc.date.copyright | 2009-08-18 | |
dc.date.issued | 2009 | |
dc.date.submitted | 2009-08-03 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/23156 | - |
dc.description.abstract | 垂直延展之面心立方結構錳(001)薄膜已經被證實可以穩定的在鈷/銅(001)基板上成長,從磁光柯爾效應研究中,發現此系統的反鐵磁性特性,有隨著溫度及錳原子層厚度改變的相依性。並利用自旋偏極化掃瞄穿隧電子顯微鏡解析樣品表面原子自旋方向的技術,將可對此面心立方錳(001)的表面自旋結構,做出微小尺度上的研究。其方法為,將鎢探針鍍上四十層鐵原子層,使得探針尖端具有平行於樣品平面的磁異向能,如此便可從掃瞄穿隧電子顯微鏡的影像中,解析出平行於樣品平面分量的自旋結構,在低溫( 77.5 K )以及超高真空環境量測下,得到錳具有平行於樣品平面的層狀反鐵磁性自旋組態。另外我們在錳的表面接近原子台階邊緣的地方觀察到自旋翻轉,我們的微磁學模擬可以得到一致的結果。 | zh_TW |
dc.description.abstract | Expanded face-centered tetragonal (e-fct) Mn (001) layers have been demonstrated to grow stably on Co/Cu(001) template. From the MOKE measurements, the antiferromagnetic properties of e-fct Mn has been studied through the behavior of the temperature and thickness dependence. In addition, with the surface spin sensitive techniques, spin-polarized scanning tunneling microscopy, the spin configuration on surface of such expanded-fct Mn(001) can be resolved. By using the 40 ML Fe coated W tip of in-plane magnetic anisotropy direction preference, the in-plane layered antiferromagnetic spin structures of e-fct Mn have been observed at the 77.5 K in ultrahigh vacuum environment. We observed the spin frustration phenomenon along the edge. The OOMMF simulation could obtain the consistent result. | en |
dc.description.provenance | Made available in DSpace on 2021-06-08T04:44:47Z (GMT). No. of bitstreams: 1 ntu-98-R95222036-1.pdf: 2591671 bytes, checksum: 313fbd07092a17ffc4ccabcabc4de92b (MD5) Previous issue date: 2009 | en |
dc.description.tableofcontents | Abstract iii
1 Introduction 1 2 Experimental Apparatus 9 2.1 Ultrahigh Vacuum Vystem . . . . . . . . . . . . . . . . . . . . . . . . 9 2.1.1 Pumping System . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.1.2 Sputtering and Annealing . . . . . . . . . . . . . . . . . . . . 13 2.2 Low-Energy Electron Di®raction Principle . . . . . . . . . . . . . . . 14 2.2.1 LEED Principle . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.2.2 LEED I/V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2.3 Magneto-Optical Kerr E®ect principle . . . . . . . . . . . . . . . . . . 16 2.3.1 DC-MOKE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2.3.2 AC-MOKE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2.4 Scanning Tunneling Microscopy/Spectroscopy Principle . . . . . . . . 21 2.4.1 Tunneling E®ect . . . . . . . . . . . . . . . . . . . . . . . . . 21 2.4.2 STS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 2.5 Spin-polarized STM=STS Principle . . . . . . . . . . . . . . . . . . . 24 2.5.1 Spin-Polarized Tunneling . . . . . . . . . . . . . . . . . . . . . 26 2.5.2 Experiment Apparatus . . . . . . . . . . . . . . . . . . . . . . 28 3 Crystalline Structure and Morphology of Mn/Co/Cu(001) 30 3.1 Cu(001) Surface Morphology . . . . . . . . . . . . . . . . . . . . . . . 30 3.2 Deposition Rate Calibration . . . . . . . . . . . . . . . . . . . . . . . 32 3.3 LEED and LEED I/V Results . . . . . . . . . . . . . . . . . . . . . . 32 3.4 Morphology of 5 ML Co=Cu(001) . . . . . . . . . . . . . . . . . . . . 36 3.5 Morphology of 5.5 ML Mn=5ML Co=Cu(001) . . . . . . . . . . . . . . 38 4 Electronic properties and Magnetic properties of Mn=Co=Cu(001) system 44 4.1 MOKE Data of Mn=Co=Cu(001) System . . . . . . . . . . . . . . . . 44 4.2 STS Mapping and Curves . . . . . . . . . . . . . . . . . . . . . . . . 45 4.3 SP-STS Mapping and Curve . . . . . . . . . . . . . . . . . . . . . . . 49 5 Discussion 53 5.1 Asymmetry of dI/dV Mapping . . . . . . . . . . . . . . . . . . . . . . 53 5.2 Fitting the dI/dV Curves . . . . . . . . . . . . . . . . . . . . . . . . . 54 5.3 Domain Wall Near The Edge . . . . . . . . . . . . . . . . . . . . . . . 58 5.3.1 Domain Wall Line Pro‾le . . . . . . . . . . . . . . . . . . . . 58 5.3.2 Layered AFM Orientation and OOMMF Simulation . . . . . . 60 6 Conclusions 68 Bibliography 71 | |
dc.language.iso | en | |
dc.title | 利用低溫自旋偏極化掃瞄穿隧電子顯微鏡解析垂直延展之面心立方結構錳(001)的層狀反鐵磁性自旋結構 | zh_TW |
dc.title | Layered Antiferromagnetic Spin Structure of Expanded-fct Mn(001) Resolved by Low Temperature Spin-Polarized Scanning Tunneling Microscopy | en |
dc.type | Thesis | |
dc.date.schoolyear | 97-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 江文中,陳智泓,吳仲卿,蔡志申 | |
dc.subject.keyword | 自旋偏極化電子穿隧掃瞄顯微鏡,垂直延展之面心立方結構錳,反鐵磁自旋組態, | zh_TW |
dc.subject.keyword | SP-STM,Expanded-fct Mn(001),Antiferromagnetic spin orientation, | en |
dc.relation.page | 74 | |
dc.rights.note | 未授權 | |
dc.date.accepted | 2009-08-03 | |
dc.contributor.author-college | 理學院 | zh_TW |
dc.contributor.author-dept | 物理研究所 | zh_TW |
顯示於系所單位: | 物理學系 |
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