论文标题
PT合金中自旋轨道转换效率的基准测试
Benchmarking of spin-orbit torque switching efficiency in Pt alloys
论文作者
论文摘要
我们系统地对PT $ _ {X} $ CU $ _ {1-X} $/CO/MGO磁性异质结构进行了垂直磁各向异性的调查，并报告了PT-CU合金系统中的自旋轨道扭矩开关效率的显着提高。由磁滞回路偏移测量确定的最大的类似阻尼的自旋轨道扭矩效率约为0.44，pt $ _ {0.57} $ cu $ _ {0.43} $，源自合金调谐的较高电阻率。此外，从电流诱导的开关测量结果的结果来看，由于自旋轨道扭矩效率的同时增强和CO层的强制性降低，通过适当的合金来实现较低的临界切换电流密度。最后，展示了使用Pt $ _ {x} $ cu $ _ {1-x} $合金降低功耗和保持良好的热稳定性的能力，这表明PT $ _ {X} $ _ {x} $ cu $ _ {1-x} $是未来SOT SOT-MRAM应用程序的有吸引力的候选人。
We systematically survey on Pt$_{x}$Cu$_{1-x}$/Co/MgO magnetic heterostructure with perpendicular magnetic anisotropy and report a significant improvement on spin-orbit torque switching efficiency in Pt-Cu alloy system. The largest damping-like spin-orbit torque efficiency determined by hysteresis loop shift measurement is about 0.44 for Pt$_{0.57}$Cu$_{0.43}$, which is originated from the higher resistivity tuned by alloying. Moreover, from the results of current-induced switching measurements, a lower critical switching current density is achieved by proper alloying due to the simultaneous enhancement of spin-orbit torque efficiency and reduction of coercivity of the Co layer. Finally, the ability to lower power consumption and preserve good thermal stability using Pt$_{x}$Cu$_{1-x}$ alloy is demonstrated, which suggests that Pt$_{x}$Cu$_{1-x}$ is an attractive candidate for future SOT-MRAM applications.
