請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/76730
標題: | 磁性穿隧接面的熱自旋傳輸 Thermal spin transfer in magnetic tunnel junctions |
作者: | Yan-Yu Yang 楊晏宇 |
指導教授: | 薛文証 |
關鍵字: | 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, thermal spin-transfer torque,magnetic tunnel junction,free-electron model,thermoelectric properties, |
出版年 : | 2016 |
學位: | 碩士 |
摘要: | 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。 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. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/76730 |
DOI: | 10.6342/NTU201601475 |
全文授權: | 未授權 |
顯示於系所單位: | 工程科學及海洋工程學系 |
文件中的檔案:
檔案 | 大小 | 格式 | |
---|---|---|---|
ntu-105-R03525029-1.pdf 目前未授權公開取用 | 1.95 MB | Adobe PDF |
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。