垂直磁化自旋阀纳米柱中极化偶极场引起的非对称开关行为
Asymmetric switching behavior in perpendicularly magnetized spin-valve nanopillars due to the polarizer dipole field
摘要：
我们报道了垂直磁化自旋阀纳米柱的自由层开关场分布。虽然分布是一致的热活化模型，它们显示出强烈的不对称性之间的平行反平行和反向过渡，与平行反平行过渡的能量势垒高出50%以上。来自偏振器的不均匀偶极场被证明是这种对称性破缺的起源。有趣的是，对称性恢复与光刻定义的凹口对从柱横截面的中点沿椭圆长轴删除的设备。这些结果对垂直磁化MRAM位单元的热稳定性具有重要意义。
英文摘要：
We report the free layer switching field distributions of spin-valve nanopillars with perpendicular magnetization. While the distributions are consistent with a thermal activation model, they show a strong asymmetry between the parallel to antiparallel and the reverse transition, with energy barriers more than 50% higher for the parallel to antiparallel transitions. The inhomogeneous dipolar field from the polarizer is demonstrated to be at the origin of this symmetry breaking. Interestingly, the symmetry is restored for devices with a lithographically defined notch pair removed from the midpoint of the pillar cross-section along the ellipse long axis. These results have important implications for the thermal stability of perpendicular magnetized MRAM bit cells.
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