Mendes J B S, Alves Santos O, Meireles L M, Lacerda R G, Vilela-Leão L H, Machado F L A, Rodríguez-Suárez R L, Azevedo A, Rezende S M
Departamento de Física, Universidade Federal de Viçosa, 36570-900 Viçosa, Minas Gerais, Brasil.
Departamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife, Pernambuco, Brasil.
Phys Rev Lett. 2015 Nov 27;115(22):226601. doi: 10.1103/PhysRevLett.115.226601. Epub 2015 Nov 25.
The use of graphene in spintronic devices depends, among other things, on its ability to convert a spin excitation into an electric charge signal, a phenomenon that requires a spin-orbit coupling (SOC). Here we report the observation of two effects that show the existence of SOC in large-area CVD grown single-layer graphene deposited on a single crystal film of the ferrimagnetic insulator yttrium iron garnet (YIG). The first is a magnetoresistance of graphene induced by the magnetic proximity effect with YIG. The second is the detection of a dc voltage along the graphene layer resulting from the conversion of the spin current generated by spin pumping from microwave driven ferromagnetic resonance into a charge current, which is attributed to the inverse Rashba-Edelstein effect.
石墨烯在自旋电子器件中的应用，除其他因素外，取决于其将自旋激发转换为电荷信号的能力，这种现象需要自旋轨道耦合（SOC）。在此，我们报告了两项效应的观测结果，这些效应表明在沉积于亚铁磁绝缘体钇铁石榴石（YIG）单晶薄膜上的大面积化学气相沉积（CVD）生长的单层石墨烯中存在SOC。第一个效应是由与YIG的磁近邻效应引起的石墨烯磁电阻。第二个效应是检测到沿石墨烯层的直流电压，该电压源于由微波驱动的铁磁共振的自旋泵浦产生的自旋电流转换为电荷电流，这归因于逆 Rashba-Edelstein 效应。
