Demonstration of Nanosecond Operation in Stochastic Magnetic Tunnel Junctions

Magnetic tunnel junctions operating in the superparamagnetic regime are promising devices field of probabilistic computing, which is suitable for applications like high-dimensional optimization or sampling problems. Further, random number generation interest cryptography. For such applications, a device's uncorrelated fluctuation time-scale can determine effective system speed. It has been theoretically proposed that magnetic junction designed to have only easy-plane anisotropy provides rates determined by its field, and perform on nanosecond faster as measured magnetoresistance's autocorrelation time. Here we provide experimental evidence scale fluctuations circular shaped junction, consistent with finite-temperature coupled macrospin simulation results prior theoretical expectations. We further assess degree stochasticity signal.