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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 薛文証(Wen-Jeng Hsueh) | |
| dc.contributor.author | Kui-Jun Huang | en |
| dc.contributor.author | 黃奎鈞 | zh_TW |
| dc.date.accessioned | 2021-06-08T00:52:58Z | - |
| dc.date.copyright | 2015-08-28 | |
| dc.date.issued | 2015 | |
| dc.date.submitted | 2015-06-15 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/18155 | - |
| dc.description.abstract | 本文主旨為研究於磁性穿隧接面中的自旋轉移力矩特性，自旋轉移力矩是一種使用自旋極化電流趨動鐵磁性金屬中磁化的自旋電子學概念，受到力矩的磁矩將會進行轉動甚至是翻轉，本研究探討自旋轉移力矩的性質，首先在理論上使用自由電子模型建構出於金屬內傳輸的自旋流的基本性質，並且使用了轉移矩陣法求出磁性穿隧接面內的自旋流，最後使用自旋角動量守恆得到兩種分量的自旋轉移力矩，分別為平面內力矩與平面外力矩。透過對磁性穿隧接面與外加偏壓之參數分析，發現了元件的厚度、位能、自旋分裂能與外加偏壓等變化而影響到穿隧磁阻以及自旋轉移力矩的大小，並且即使在對稱結構中力矩對電壓也會呈現非對稱關係。自旋轉移力矩現象最主要的用途在使用電流而不是磁場調控磁阻大小，本研究提供製作元件的參考，有助於提升磁性穿隧接面中關於自旋轉移力矩的性能。 | zh_TW |
| dc.description.abstract | In this thesis, the properties of spin-transfer torque in magnetic tunnel junction are studied. In the beginning, free electron model is used to construct the basic properties of the transfer of spin current. The spin current in magnetic tunnel junction is calculated using transfer matrix method. Spin angular momentum conservation is used to obtain the spin transfer torques, which have two components, in-plane torque and out-of-plane torque. The numerical results show that the bias-induced spin-transfer torque is a function of angle between magnetic moments, barrier height, thickness and spin splitting energy. It is find that the bias voltage dependence of the spin torque is not symmetric, even for symmetric magnetic tunnel junctions. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-08T00:52:58Z (GMT). No. of bitstreams: 1 ntu-104-R01525037-1.pdf: 2397706 bytes, checksum: 86c38c10b946d6ccedc47f8a6f8da31f (MD5) Previous issue date: 2015 | en |
| dc.description.tableofcontents | 中文摘要 i
英文摘要 ii 目錄 iii 圖目錄 v 表目錄 vii 符號表 viii 第一章 導論 1 1.1 背景與研究動機 1 1.2 歷史文獻回顧 3 1.3 論文架構 4 第二章 磁性材料與磁性穿隧接面 6 2.1 磁性之起源 6 2.2 磁矩與磁化強度 6 2.3 磁性物質的分類 9 2.3.1 反磁性 9 2.3.2 順磁性 9 2.3.3 鐵磁性 10 2.3.4 亞鐵磁性與反鐵磁性 10 2.4 磁阻 11 2.4.1 巨磁阻現象 11 2.4.2 穿隧磁阻現象 12 2.4.3 磁阻式隨機存取記憶體 13 2.5 動態方程式 14 2.5.1 旋磁進動 14 2.5.2 Landau-Lifshitz-Gilbert方程式 15 第三章 自旋流與自由電子模型 27 3.1 自旋流 27 3.2 自旋注入 28 3.3 自由電子模型 30 3.3.1 波函數與波向量 30 3.3.2 勢壘層與鐵磁層外加偏壓之變化 34 3.3.3 邊界條件 34 3.3.4 穿隧機率流 36 3.3.5 外加偏壓引起的自旋流 37 3.4 轉移矩陣法 39 3.5 磁性穿隧接面中的自旋流 41 3.5.1 自旋流與垂直能量 41 3.5.2 自旋分裂能量 43 第四章 磁性穿隧接面中自旋轉移力矩特性 54 4.1 自旋流與自旋轉移力矩 54 4.2 於Landau-Lifshitz-Gilbert方程式引入自旋力矩 55 4.3 磁矩角度差異與自旋轉移力矩 57 4.4 磁性穿隧接面中自旋分裂能量之影響 57 4.5 自旋轉移力矩以及勢壘層之厚度以及位能關係 58 4.6 磁性穿隧接面中自旋轉移力矩受偏壓之影響 59 第五章 結論與未來展望 73 5.1 結論 73 5.2 未來展望 74 參考文獻 75 | |
| dc.language.iso | zh-TW | |
| dc.title | 外加偏壓下磁性穿隧接面之自旋轉移力矩 | zh_TW |
| dc.title | Bias-Induced Spin Transfer Torque in Magnetic Tunneling
Junctions | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 103-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 鄭勝文(Sheng-Wen Cheng),黃俊穎,余宗興 | |
| dc.subject.keyword | 自旋轉移力矩,磁性穿隧接面,穿隧磁阻,自由電子模型,轉移矩陣法, | zh_TW |
| dc.subject.keyword | spin transfer torque,magnetic tunnel junction,tunnel magnetoresistance,free-electron model,transfer matrix method, | en |
| dc.relation.page | 78 | |
| dc.rights.note | 未授權 | |
| dc.date.accepted | 2015-06-15 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 工程科學及海洋工程學研究所 | zh_TW |
| 顯示於系所單位： | 工程科學及海洋工程學系 | |
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