铁磁/绝缘体/铁磁异质结中自旋极化电子的隧穿概率和隧穿时间

The Tunneling Probability and Time of Spin-polarized Electrons in Ferromagnetic/Insulator/Ferromagnetic Heterojunction

在群速度概念的基础上,研究了自旋电子隧穿通过铁磁/绝缘体/铁磁异质结中的隧穿概率和隧穿时间.研究结果表明:不同自旋方向的电子其隧穿概率和隧穿时间不仅与绝缘体长度和入射电子能量有关,而且强烈地依赖于两端铁磁层夹角的变化.当两铁磁层中磁矩取向反平行时,不同自旋方向的电子隧穿概率相同;而在两磁矩取向垂直时,不同自旋方向的电子隧穿时间相等.除此之外,不同自旋方向的电子无论是隧穿概率还是隧穿时间都呈明显的分离现象.

Based on the concept of group velocity,the tunneling probability and time in ferromagnetic/insulator/ferromagnetic tunnel junction are studied. The results show that the tunneling probabilities and time for spin-up and spin-down electrons not only dependent on the length of the insulator and the energy of the incident electron,but also dependent on the angle between the two magnetic moments of the two ferromagnet layers strongly. When the two magnetic moments are antiparallel,the tunneling probabilities for the spin-up and spin-down electrons are equal,and when the two magnetic moments are vertical,the tunneling time for the spin-up and spin-down electrons are equal as well. In addition,the tunneling probabilities and tunneling time for the spin-up and spin-down electrons appear obviously separation phenomenon.