Thermal spin transfer in Fe-MgO-Fe tunnel junctions.
Thermal spin transfer in Fe-MgO-Fe tunnel junctions.
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DOI：
10.1103/physrevlett.107.176603
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发表时间：
2011-06
影响因子：
8.6
通讯作者：
X. Jia;K. Xia;G. Bauer
中科院分区：
文献类型：
--
作者：
X. Jia;K. Xia;G. Bauer
我们使用第一性原理波函数匹配方法计算了Fe-MgO-Fe隧道结中的热自旋传递（TST）扭矩。在室温下，具有3个MgO单层的结中的TST达到10(-7)J/m(2)/K，估计在10 K量级的势垒上，温度差异会导致磁化反转。超大的TST可以通过超薄势垒在界面态之间的多次散射来解释。TST的角度依赖性可能非常偏斜，可能导致热诱导高频产生。
We compute thermal spin transfer (TST) torques in Fe-MgO-Fe tunnel junctions using a first principles wave-function-matching method. At room temperature, the TST in a junction with 3 MgO monolayers amounts to 10(-7) J/m(2)/K, which is estimated to cause magnetization reversal for temperature differences over the barrier of the order of 10 K. The large TST can be explained by multiple scattering between interface states through ultrathin barriers. The angular dependence of the TST can be very skewed, possibly leading to thermally induced high-frequency generation.