论文标题
通过Landau风扇移位直接测定磁石墨烯中的旋转能量
Direct Determination of Spin-Splitting Energy in Magnetic Graphene by Landau Fan Shifts
论文作者
论文摘要
具有较大且可调的自旋分解能量的自旋偏振二维材料承诺2D旋转的场。尽管石墨烯一直是规范的2D材料，但其自旋特性和可调性受到限制。在这里，我们证明了石墨烯中强大的自旋极化的出现，在零施加的磁场下，高达132 MeV的大型可调节的自旋分解能的出现。自旋极化是通过石墨烯与下面的铁磁性氧化物绝缘层TM3FE5O12之间的磁交换相互作用诱导的，如其X射线磁性圆形二色性所证实。通过分析测得的subnikov-de-haas振荡映射的Landau粉丝图的变化，直接测量了旋转能量，并可视化了旋转能量，这是应用电场的函数，显示出与我们的第一原则和机器学习计算的一致性。此外，可以通过冷却场在98至166 MEV之间的宽范围内调节观察到的旋转能量。我们的方法和结果适用于其他二维（磁性）材料和异质结构，并为开发下一代旋转逻辑和记忆设备提供了巨大的潜力。
Spin-polarized two-dimensional materials with large and tunable spin-splitting energy promise the field of 2D spintronics. While graphene has been a canonical 2D material, its spin properties and tunability are limited. Here, we demonstrate the emergence of robust spin-polarization in graphene with large and tunable spin-splitting energy of up to 132 meV at zero applied magnetic fields. The spin polarization is induced through a magnetic exchange interaction between graphene and the underlying ferrimagnetic oxide insulating layer, Tm3Fe5O12, as confirmed by its X-ray magnetic circular dichroism. The spin-splitting energies are directly measured and visualized by the shift in their landau fan diagram mapped by analyzing the measured subnikov-de-Haas oscillations as a function of applied electric fields, showing consistent fit with our first-principles and machine learning calculations. Further, the observed spin-splitting energies can be tuned over a broad range between 98 and 166 meV by cooling fields. Our methods and results are applicable to other two-dimensional (magnetic) materials and heterostructures, and offer great potential for developing next-generation spin logic and memory devices.
