摘要
Researchers demonstrate how multilevel storage can be achieved in Co/Pt multilayers without extra initialization steps. By stacking Co/Pt repeatedly to N layers, the magnetic property can be tailored with large spin�orbit torques (SOT) as in the Co/Pd multilayers. They perform the read/write test on the N = 2 Co/Pt multilayers and demonstrate four well-separated multilevel states without initialization steps. The theoretical predictions provide nice agreement with the experimental findings by generalizing the modified Landau�Lifshitz�Gilbert equation to the multidomain configurations, rendering the SOT switching mechanism in Co/Pt multilayers well understood.