Current control of time-averaged magnetization in superparamagnetic tunnel junctions
Current control of time-averaged magnetization in superparamagnetic tunnel junctions
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DOI：
10.1063/1.5012091
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发表时间：
2017-12-11
影响因子：
4
通讯作者：
Majetich, Sara A.
中科院分区：
文献类型：
--
作者：
Bapna, Mukund;Majetich, Sara A.
这项工作研究了在一个小的20 nm × 60 nm的纳米磁体的时间平均磁化的自旋转移力矩控制与低热稳定因子，A类似于11。这里，纳米磁体是磁性隧道结的一部分，并且相对于参考层的磁化在平行和反平行磁化状态之间波动，从而在电流对时间测量中生成电报信号。首先分析纳米磁体对外部场的响应以表征磁性。然后，我们表明，在电报信号的时间平均磁化强度可以完全控制在+1和-1之间的电压在一个小范围内的0.25 V的NIST统计测试套件分析进行测试的电报信号的真实随机性时，该设备产生的自旋转移扭矩在临界电流值附近操作。利用在两个不同电压下产生的电报信号的概率性质，示出了使用人工AND逻辑门的两个数字的乘法的原型演示。由AIP出版社出版。
This work investigates spin transfer torque control of time-averaged magnetization in a small 20 nm x 60 nm nanomagnet with a low thermal stability factor, A similar to 11. Here, the nanomagnet is a part of a magnetic tunnel junction and fluctuates between parallel and anti-parallel magnetization states with respect to the magnetization of the reference layer generating a telegraph signal in the current versus time measurements. The response of the nanomagnet to an external field is first analyzed to characterize the magnetic properties. We then show that the time-averaged magnetization in the telegraph signal can be fully controlled between +1 and -1 by voltage over a small range of 0.25 V. NIST Statistical Test Suite analysis is performed for testing true randomness of the telegraph signal that the device generates when operated at near critical current values for spin transfer torque. Utilizing the probabilistic nature of the telegraph signal generated at two different voltages, a prototype demonstration is shown for multiplication of two numbers using an artificial AND logic gate. Published by AIP Publishing.