面内磁化铁磁体双层金属膜的自旋霍尔磁电阻效应
Spin Hall Magnetoresistance in Metallic Bilayers with In-plane Magnetized Ferromagnets
摘要：
我们重新回顾了由重金属（H）与面内磁化铁磁金属（F）耦合组成的双层膜中自旋霍尔磁电阻（SMR）的理论和实验，并确定了四种不同双层膜系统：W/ $\text{Co}_{20}\text{Fe}_{60}\text{B}_{20}$，W/Co，$\text{Co}_{20}\text{Fe}_{60}\text{B}_{20}$ /Pt和Co/Pt中SMR和各向异性磁电阻（AMR）对磁电阻的贡献。为了做到这一点，AMR明确地包括在铁磁体的扩散输运方程。结果允许精确确定不同的贡献的磁阻，这可以发挥重要的作用，在优化未来的杂散磁场传感器。它们也可能是有用的，在确定自旋输运性质的金属磁性异质结构在其他实验的基础上的磁阻测量。
英文摘要：
We revisit the theory and experiment on spin Hall magnetoresistance (SMR) in bilayers consisting of a heavy metal (H) coupled to in-plane magnetized ferromagnetic metal (F), and determine contributions to the magnetoresistance due to SMR and anisotropic magnetoresistance (AMR) in four different bilayer systems: W/$\text{Co}_{20}\text{Fe}_{60}\text{B}_{20}$, W/Co, $\text{Co}_{20}\text{Fe}_{60}\text{B}_{20}$/Pt, and Co/Pt. To do this, the AMR is explicitly included in the diffusion transport equations in the ferromagnet. The results allow precise determination of different contributions to the magnetoresistance, which can play an important role in optimizing prospective magnetic stray field sensors. They also may be useful in the determination of spin transport properties of metallic magnetic heterostructures in other experiments based on magnetoresistance measurements.
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