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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/31820
標題: | 磁壁在磁場及極化自旋電流下之運動行為 One-Dimentional Wall Motion Driven by Magnetic Field and Spin-Polarized Current |
作者: | Yi-Chen Yang 楊毅楨 |
指導教授: | 張慶瑞 |
關鍵字: | 磁壁, Domain Wall Motion,Spin-Polarized Current, |
出版年 : | 2006 |
學位: | 碩士 |
摘要: | Abstract
When a spin-polarized current ‡ows through a ferromagnet, the local magnetization receives a spin transfer torque. In one-dimention approxi- mations, we solve the Landau-Lifshitz-Gilbert equation along with two spin torque terms, both analytically and numerically, to realize the behavior of a domain wall under the in‡uence of the spin-polarized current. As a …rst step, we focus on the system of domain wall within a perfect magnetic nanowire. Secondly, we consider the pinning case which may be caused by doping a high-Ku material into the system. By numerically solving the LLG equation, we …nd some characteristics of domain-wall motion under the spin-polarized current. In the presence of domain-wall pinning centers, we also de…ned the depinning …eld and construct a phase diagram for the domain-wall. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/31820 |
全文授權: | 有償授權 |
顯示於系所單位: | 物理學系 |
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