Field-free and sub-ns magnetization switching of magnetic tunnel junctions by combining spin-transfer torque and spin–orbit torque
Field-free and sub-ns magnetization switching of magnetic tunnel junctions by combining spin-transfer torque and spin–orbit torque
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DOI：
10.1063/5.0039061
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发表时间：
2021-03
影响因子：
4
通讯作者：
Chaoliang Zhang;Y. Takeuchi;S. Fukami;H. Ohno
中科院分区：
文献类型：
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作者：
Chaoliang Zhang;Y. Takeuchi;S. Fukami;H. Ohno
我们通过自旋转移力矩（STT）和自旋轨道力矩（SOT）的组合来研究磁化翻转。STT和SOT是由流经面内易轴磁性隧道结以及其下方的Ta/W通道的脉冲电流同时诱导产生的。SOT使得磁化能够在亚纳秒脉冲（低至200皮秒）下翻转，并且STT消除了对外部磁场的需求。在短脉冲条件下，翻转电流比仅由STT驱动的情况要小得多。我们还比较了通道纵向方向上具有正交（Y型）和共线（X型）易磁化轴的两种结构之间的阈值电流，并且发现在200皮秒时，X型的翻转电流比Y型小1/4。
We investigate the magnetization switching via a combination of spin-transfer torque (STT) and spin–orbit torque (SOT). STT and SOT are simultaneously induced by a pulsed current flowing through an in-plane easy-axis magnetic tunnel junction and an underneath Ta/W channel. SOT allows the magnetization to be switched with the sub-ns pulse down to 200 ps and STT eliminates the necessity of an external field. The switching current is much smaller than the case driven solely by STT in the short pulse regime. We also compare the threshold current between two structures having orthogonal (Type Y) and collinear (Type X) magnetic easy axes to the longitudinal direction of the channel and find that the Type X achieves smaller switching current by a factor of 1/4 at 200 ps.