Ultrafast demagnetization enhancement in CoFeB/MgO/CoFeB magnetic tunneling junction driven by spin tunneling current.

Ultrafast demagnetization enhancement in CoFeB/MgO/CoFeB magnetic tunneling junction driven by spin tunneling current.
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自旋隧道电流驱动 CoFeB/MgO/CoFeB 磁隧道结的超快退磁增强

DOI:
10.1038/srep02883
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发表时间:
2013-10-07
期刊:
影响因子:
4.6
通讯作者:
Cheng, Zhao-Hua
Cheng, Zhao-Hua
中科院分区:
综合性期刊3区
文献类型:
--
作者:
He, Wei;Zhu, Tao;Zhang, Xiang-Qun;Yang, Hai-Tao;Cheng, Zhao-Hua

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通过时间分辨磁光克尔效应 (TRMOKE),利用 CoFeB/MgO/CoFeB 磁隧道结的激光诱导超快退磁,实现两个磁性层之间磁化的平行态(P 态)和反平行态(AP 态)。观察到AP状态下的退磁时间比P状态下的退磁时间更短并且退磁的幅度更大。这些行为归因于两个 CoFeB 层之间通过热电子隧道穿过 MgO 势垒而实现的超快自旋转移。我们的观察表明,超快退磁可以通过热电子隧道电流来实现。它打开了操纵磁隧道结中超快自旋电流的大门。
The laser-induced ultrafast demagnetization of CoFeB/MgO/CoFeB magnetic tunneling junction is exploited by time-resolved magneto-optical Kerr effect (TRMOKE) for both the parallel state (P state) and the antiparallel state (AP state) of the magnetizations between two magnetic layers. It was observed that the demagnetization time is shorter and the magnitude of demagnetization is larger in the AP state than those in the P state. These behaviors are attributed to the ultrafast spin transfer between two CoFeB layers via the tunneling of hot electrons through the MgO barrier. Our observation indicates that ultrafast demagnetization can be engineered by the hot electrons tunneling current. It opens the door to manipulate the ultrafast spin current in magnetic tunneling junctions.
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