Magnetization switching by combining electric field and spin-transfer torque effects in a perpendicular magnetic tunnel junction.
Magnetization switching by combining electric field and spin-transfer torque effects in a perpendicular magnetic tunnel junction.
复制标题
通过在垂直磁隧道结中结合电场和自旋转移矩效应来实现磁化切换
DOI：
10.1038/srep18719
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发表时间：
2016-01-06
影响因子：
4.6
通讯作者：
Duan CG
中科院分区：
文献类型：
--
作者：
Zhang X;Wang C;Liu Y;Zhang Z;Jin QY;Duan CG
在垂直磁化隧道结中由电场驱动的磁化方向的有效操纵为开发低功率磁存储器引入了技术相关的可能性。然而，双极性取向特性的触发类磁化开关具有内在的困难，在实际应用中。通过在Landau-Lifshitz-吉尔伯特模拟中同时考虑面内自旋转移矩（T//）和类场自旋转移矩（T），在电场和自旋极化电流共同作用下，只要电场脉冲宽度超过某一临界值τc，就可以在显著减小的电流密度5× 109 A/m2下实现可靠的确定性磁化反转.所需的临界τ c随着T_∞强度的增大而减小，因为T_∞越强，最终稳定的面外磁化分量越大，其负值越大。这种确定性的磁化开关的功耗被发现是两个数量级低于仅由电流驱动的开关。
Effective manipulation of magnetization orientation driven by electric field in a perpendicularly magnetized tunnel junction introduces technologically relevant possibility for developing low power magnetic memories. However, the bipolar orientation characteristic of toggle-like magnetization switching possesses intrinsic difficulties for practical applications. By including both the in-plane (T//) and field-like (T⊥) spin-transfer torque terms in the Landau-Lifshitz-Gilbert simulation, reliable and deterministic magnetization reversal can be achieved at a significantly reduced current density of 5×109A/m2under the co-action of electric field and spin-polarized current, provided that the electric-field pulse duration exceeds a certain critical value τc. The required critical τcdecreases with the increase ofT⊥strength because strongerT⊥can make the finally stabilized out-of-plane component of magnetization stay in a larger negative value. The power consumption for such kind of deterministic magnetization switching is found to be two orders of magnitude lower than that of the switching driven by current only.