论文标题
部分可观测时空混沌系统的无模型预测
Perpendicular magnetic anisotropy, tunneling magnetoresistance and spin-transfer torque effect in magnetic tunnel junctions with Nb layers
论文作者
论文摘要
NB及其化合物由于其高超导过渡温度和高临界场而被广泛用于量子计算中。结合了超导性能和自旋形式非挥发性的设备可以提供独特的功能。在这里，我们报告了将NB作为重金属层的磁性隧道连接的研究。在NB/COFEB/MGO异质结构中获得了界面垂直磁各向异性能量密度为1.85 MJ/m2。在具有不同厚度组合和不同退火条件的连接处评估了隧穿磁磁性。在室温下获得了优化的磁化率为120％，通过铁磁共振确定的阻尼参数为0.011。此外，在这些连接中也成功观察到了自旋转移扭矩切换，而绝对开关电流密度为7.3*10^5 A/CM2。
Nb and its compounds are widely used in quantum computing due to their high superconducting transition temperatures and high critical fields. Devices that combine superconducting performance and spintronic non-volatility could deliver unique functionality. Here we report the study of magnetic tunnel junctions with Nb as the heavy metal layers. An interfacial perpendicular magnetic anisotropy energy density of 1.85 mJ/m2 was obtained in Nb/CoFeB/MgO heterostructures. The tunneling magnetoresistance was evaluated in junctions with different thickness combinations and different annealing conditions. An optimized magnetoresistance of 120% was obtained at room temperature, with a damping parameter of 0.011 determined by ferromagnetic resonance. In addition, spin-transfer torque switching has also been successfully observed in these junctions with a quasistatic switching current density of 7.3*10^5 A/cm2.
