论文标题
重金属/铁磁绝缘子系统中的强界面交换场由旋转霍尔磁场确定
Strong interfacial exchange field in a heavy metal/ferromagnetic insulator system determined by spin Hall magnetoresistance
论文作者
论文摘要
重金属/磁性绝缘子界面的自旋依赖性转运是在Spintronics Research的最前沿的许多现象的起源。对不同界面自旋电导的正确定量对于许多应用至关重要。在这里，我们报告了纯铁磁绝缘子（EUS）上PT的自旋霍尔磁磁性（SMR）的首次测量。我们在广泛的温度下进行SMR测量，并使用微观模型拟合结果。从此拟合过程中，我们获得了旋转电导率（$ g_s $，$ g_r $和$ g_i $）的温度依赖性，从而删除了类似野外扭矩（$ g_i $）的贡献（$ g_i $），类似阻尼的扭矩（$ g_r $）和Spin-Flip散射（$ g_s $）。可以从$ g_i $估计的1 MeV订单的界面交换字段，其作用于PT的传导电子，该$ G_I $至少大于$ G_R $以下的三倍。我们的工作提供了一种简单的方法来量化这个界面自旋分解场，该界面旋转式散发场在新兴领域（例如超导Spintronics和caloritronics以及拓扑量子计算）中起着关键作用。
Spin-dependent transport at heavy metal/magnetic insulator interfaces is at the origin of many phenomena at the forefront of spintronics research. A proper quantification of the different interfacial spin conductances is crucial for many applications. Here, we report the first measurement of the spin Hall magnetoresistance (SMR) of Pt on a purely ferromagnetic insulator (EuS). We perform SMR measurements in a wide range of temperatures and fit the results by using a microscopic model. From this fitting procedure we obtain the temperature dependence of the spin conductances ($G_s$, $G_r$ and $G_i$), disentangling the contribution of field-like torque ($G_i$), damping-like torque ($G_r$), and spin-flip scattering ($G_s$). An interfacial exchange field of the order of 1 meV acting upon the conduction electrons of Pt can be estimated from $G_i$, which is at least three times larger than $G_r$ below the Curie temperature. Our work provides an easy method to quantify this interfacial spin-splitting field, which play a key role in emerging fields such as superconducting spintronics and caloritronics, and topological quantum computation.
