Observation of thermally driven field-like spin torque in magnetic tunnel junctions
Observation of thermally driven field-like spin torque in magnetic tunnel junctions
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DOI：
10.1063/1.4958833
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发表时间：
2016-07-18
影响因子：
4
通讯作者：
Tulapurkar, Ashwin A.
中科院分区：
文献类型：
--
作者：
Bose, Arnab;Shukla, Amit Kumar;Tulapurkar, Ashwin A.
本文报道了自上而下施加热流时，磁隧道结（MTJ）中热驱动的类巨场自旋矩。通过施加温度梯度的磁阻磁滞回线的移位来检测类场项。我们观察到，类场项取决于MTJ的磁对称性。在非对称结构中，自由层和固定层采用不同的铁磁材料，类场项大大增强。我们的结果表明，通过在0.9 nm厚的MgO隧穿势垒上产生120 mK的温差，可以产生数量级为10（9）A/m（2）的纯自旋电流密度。我们的结果对于使用热驱动自旋扭矩写入MTJ和基于畴壁的存储器将是有用的。由AIP出版社出版。
We report the thermally driven giant field-like spin-torque in magnetic tunnel junctions (MTJ) on application of heat current from top to bottom. The field-like term is detected by the shift of the magneto-resistance hysteresis loop applying temperature gradient. We observed that the field-like term depends on the magnetic symmetry of the MTJ. In asymmetric structures, with different ferromagnetic materials for free and fixed layers, the field-like term is greatly enhanced. Our results show that a pure spin current density of the order of 10(9) A/m(2) can be produced by creating a 120 mK temperature difference across 0.9 nm thick MgO tunnelling barrier. Our results will be useful for writing MTJ and domain wall-based memories using thermally driven spin torque. Published by AIP Publishing.