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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 薛文証 | |
dc.contributor.author | Yan-Yu Yang | en |
dc.contributor.author | 楊晏宇 | zh_TW |
dc.date.accessioned | 2021-07-10T21:35:49Z | - |
dc.date.available | 2021-07-10T21:35:49Z | - |
dc.date.copyright | 2016-10-14 | |
dc.date.issued | 2016 | |
dc.date.submitted | 2016-07-28 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/76730 | - |
dc.description.abstract | 本文主旨為研究單層位障結構與雙層位障結構的磁性穿隧接面中的熱電特
性,在磁性穿隧接面中施加有限溫差,不但可以產生電流密度,也有熱激發自旋 轉移力矩施加於鐵磁電極中的磁矩。本研究使用自由電子模型建構出於金屬內傳 輸的自旋流的基本概念。透過對材料的參數的分析,包含了位障寬度、位能、自 旋分裂能量與兩鐵磁層溫差等變化,並探討於磁性穿隧接面中穿隧電流密度及熱 激發自旋轉移力矩大小的影響。研究結果顯示在兩鐵磁層間的溫差一致時,雙層 位障磁性穿隧接面比單層位障結構之自旋轉移力矩更大。主要是因為雙層位障磁 性穿隧接面中有共振穿隧效應。 | zh_TW |
dc.description.abstract | In this thesis, thermoelectric properties of magnetic tunnel junction(MTJ) with
single and double barriers are studied. A finite temperature difference applied to the MTJ can lead not only to charge current density but also to thermal spin-transfer torque exerted on the magnetic moments of the ferromagnetic electrodes. In the beginning, free electron model is used to construct the basic properties of the transfer of spin current density in metal. The numerical results show that the thermal spin-transfer torque is a function of angle between magnetic moments, barrier height, thickness, spin splitting energy, and the temperature difference between the two ferromagnetic layers. And the results also show that, given the same temperature gradient, spin-transfer torque for the proposed double barriers structure MTJ can be larger than that for the single barrier one. This increase can be attributed to the resonant tunneling effect in the double barriers MTJ. | en |
dc.description.provenance | Made available in DSpace on 2021-07-10T21:35:49Z (GMT). No. of bitstreams: 1 ntu-105-R03525029-1.pdf: 1998895 bytes, checksum: 6d7cc1a709711e5b45d6e19257947e5b (MD5) Previous issue date: 2016 | en |
dc.description.tableofcontents | 摘要 i
Abstract ii 目錄 iii 圖目錄 v 符號表 vii 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 5 第二章 磁阻與磁性材料 6 2.1 磁源與磁矩 6 2.2 磁性物質 10 2.3 磁阻與應用 14 第三章 磁性穿隧接面中的熱激發自旋轉移力矩 20 3.1 自旋流與自旋注入現象 20 3.2 自由電子模型 23 3.3 自旋流密度與電荷流密度 30 3.4 施加溫差引起的電荷流密度與自旋流密度 31 3.5 熱激發自旋轉移力矩 34 第四章 單層磁性穿隧接面中之熱電特性 37 4.1 位障寬度與熱電效應之影響 37 4.2 位障高度與熱電效應之影響 40 4.3 溫差與熱電效應之影響 42 4.4 磁矩角度與熱電效應之影響 43 第五章 雙層位障磁性穿隧接面中的熱電特性 45 5.1 位障寬度與熱電效應之影響 45 5.2 非磁性層寬度與熱電效應之影響 48 5.3 位障高度與熱電效應之影響 50 5.4 磁矩角度與熱電效應之影響 52 5.5 溫差與熱電效應之影響 54 第六章 結論與未來展望 57 6.1 結論 57 6.2 未來展望 58 參考文獻 59 | |
dc.language.iso | zh-TW | |
dc.title | 磁性穿隧接面的熱自旋傳輸 | zh_TW |
dc.title | Thermal spin transfer in magnetic tunnel junctions | en |
dc.type | Thesis | |
dc.date.schoolyear | 104-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 許仁華,李昭德,吳德和,陳昭宏 | |
dc.subject.keyword | 熱激發自旋轉移力矩,磁性穿隧接面,自由電子模型,熱電特性, | zh_TW |
dc.subject.keyword | thermal spin-transfer torque,magnetic tunnel junction,free-electron model,thermoelectric properties, | en |
dc.relation.page | 62 | |
dc.identifier.doi | 10.6342/NTU201601475 | |
dc.rights.note | 未授權 | |
dc.date.accepted | 2016-07-29 | |
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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