论文标题
随机磁性隧道连接中纳秒操作的演示
Demonstration of nanosecond operation in stochastic magnetic tunnel junctions
论文作者
论文摘要
在超级磁性方面运行的磁性隧道连接是概率计算领域中有前途的设备，该设备适用于诸如高维优化或采样问题之类的应用。此外，在密码学领域中，随机数的生成引起了人们的关注。对于此类应用，设备不相关的波动时间尺度可以确定有效的系统速度。从理论上讲，设计仅具有易于平面各向异性的磁性隧道接头可提供由其易于平面各向异性场决定的波动率，并且可以按照磁场的磁场能力相关的速度来测量纳秒或更快的时间尺度。在这里，我们提供了在圆形的易于平面磁性隧道连接处纳秒尺度波动的实验证据，与有限温度的耦合宏生模拟结果和先前的理论期望一致。我们进一步评估了这种信号的随机性程度。
Magnetic tunnel junctions operating in the superparamagnetic regime are promising devices in the field of probabilistic computing, which is suitable for applications like high-dimensional optimization or sampling problems. Further, random number generation is of interest in the field of cryptography. For such applications, a device's uncorrelated fluctuation time-scale can determine the effective system speed. It has been theoretically proposed that a magnetic tunnel junction designed to have only easy-plane anisotropy provides fluctuation rates determined by its easy-plane anisotropy field, and can perform on nanosecond or faster time-scale as measured by its magnetoresistance's autocorrelation in time. Here we provide experimental evidence of nanosecond scale fluctuations in a circular shaped easy-plane magnetic tunnel junction, consistent with finite-temperature coupled macrospin simulation results and prior theoretical expectations. We further assess the degree of stochasticity of such signal.
