| 对称抛物势阱磁性隧道结中的自旋输运及磁电阻效应 |
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| 引用本文： | 刘德,张红梅,贾秀敏.对称抛物势阱磁性隧道结中的自旋输运及磁电阻效应[J].物理学报,2011,60(1):17506-017506. |
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| 作者姓名： | 刘德 张红梅 贾秀敏 |
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| 作者单位： | (1)河北科技大学理学院,石家庄 050018; (2)河北师范大学物理科学与信息工程学院,石家庄 050016;河北省新型薄膜材料实验室,石家庄 050016 |
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| 基金项目： | 国家自然科学基金(批准号:10674040 和10974043),河北师范大学博士基金(批准号:L2009B02 ) 和河北科技大学基金(批准号:XL200825 ) 资助的课题. |
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| 摘 要： | 研究了两端具有铁磁接触的对称抛物势阱磁性隧道结(F/SPW/F)中自旋相关的隧穿概率和隧穿磁电阻,讨论了量子尺寸效应和Rashba 自旋轨道耦合作用对自旋极化输运特性的影响.研究结果表明:隧穿概率和隧穿磁电阻随抛物势阱宽度的增加发生周期性的振荡.抛物势阱深度的增加减小了隧穿概率和隧穿磁电阻的振荡频率.Rashba 自旋轨道耦合强度的增加加大了隧穿概率和隧穿磁电阻的振荡频率.隧穿概率和隧穿磁电阻的振幅和峰谷比强烈依赖于两铁磁电极中磁化方向的夹角.
关键词：
磁性隧道结
Rashba 自旋轨道耦合
隧穿概率
隧穿磁电阻
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| 关 键 词： | 磁性隧道结 Rashba 自旋轨道耦合 隧穿概率 隧穿磁电阻 |
| 收稿时间： | 8/1/2009 12:00:00 AM |
| 修稿时间： | 5/5/2010 12:00:00 AM |
Spin-polarized electron transport and magnetoresistance effect in symmetric parabolic-well magnetic tunneling junction |
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| Liu De,Zhang Hong-Mei,Jia Xiu-Min.Spin-polarized electron transport and magnetoresistance effect in symmetric parabolic-well magnetic tunneling junction[J].Acta Physica Sinica,2011,60(1):17506-017506. |
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| Authors: | Liu De Zhang Hong-Mei Jia Xiu-Min |
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| Affiliation: | College of Physics and Information Engineering, Hebei Normal University, Shijiazhuang 050016,China;Hebei Advanced Thin Films Laboratory, Shijiazhuang 050016,China;College of Sciences, Hebei University of Science and Technology, Shijiazhuang 050018,China;College of Sciences, Hebei University of Science and Technology, Shijiazhuang 050018,China |
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| Abstract: | We investigated the spin-dependent transmission coefficient and tunneling magnetoresistance in symmetric parabolic-well with two ferromagnetic contacts (F/SPW/F). The quantum size effect and Rashba spin-orbit interaction are discussed simultaneously. The results indicate that the transmission coefficient and tunneling magnetoresistance are periodic function of the parabolic-well width. The oscillation frequencies of the transmission coefficient and tunneling magnetoresistance decrease with the increasing of the parabolic-well depth. The oscillation frequencies of the transmission coefficient and tunneling magnetoresistance increase with the increasing of the Rashba spin-orbit coupling strength. The amplitude and peak-to-valley ratio of the transmission coefficient and tunneling magnetoresistance are strongly dependent on the difference in orientations of the two magnetizations in the left and right ferromagnets. |
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| Keywords: | magnetic tunneling junction Rashba spin-orbit coupling transmission coefficient tunneling magnetoresistance |
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