铁磁/半导体(绝缘体)/铁磁异质结中渡越时间与两铁磁层磁矩夹角变化的关系  

Relations between traversal time in ferromagnetic/semiconductor(insulator)/ferromagnetic heterojunction and the relative magnetic moment angle in two ferromagnetic layers

作　　者：吕厚祥[1] 石德政[1] 谢征微[1] 

机构地区：[1]四川师范大学物理与电子工程学院,微纳光电材料与结构实验室,成都610066

出　　处：《物理学报》2013年第20期512-518,共7页Acta Physica Sinica

基　　金：四川省教育厅自然科学基金重点项目(批准号:13ZA0149);四川高校科研创新团队建设计划(批准号:12TD008)资助的课题~~

摘　　要：在群速度概念的基础上,研究了自旋极化电子隧穿通过铁磁体/半导体(绝缘体)/铁磁体异质结时,渡越时间随两端铁磁层中磁矩夹角变化的关系.研究结果表明:当中间层为半导体层时,由于半导体层中的Rashba自旋轨道耦合强度的影响,自旋向上电子和自旋向下电子的渡越时间差会在两铁磁层相对磁矩夹角为π/2和3π/2附近出现一个极小值.当中间层为绝缘体层时,势垒高度的变化会导致不同取向的自旋极化电子渡越时间差的变化,并当势垒高度超过一临界值时发生翻转.Based on the concept of group velocity, the relations between traversal time of spin-polarized electrons in ferromag-netic/semiconductor（insulator）/ferromagnetic heterojunction and relative magnetic moment angle in two ferromagnetic layers are stud-ied. The results show that when the middle layer is semiconductor layer, influenced by the Rashba spin-orbit coupling, the minimum transverse times difference between the spin-up and down electrons can appear if the relative angle values in two ferromagnetic layers are nearly theπ/2 and 3π/2, respectively. When the middle layer is insulator, the transverse time difference between the different spin orientations can be varied with the potential barrier heights and flip if the height exceeds a critical value.

关 键 词：铁磁体 半导体(绝缘体) 铁磁体异质结 Rashba自旋轨道耦合强度 渡越时间 磁矩 

分 类 号：TM277[一般工业技术—材料科学与工程]