Spin pumping and inverse spin Hall effect in CoFeB/C${}_{60}$ bilayers

Abstract

Pure spin current based research is mostly focused on ferromagnet (FM)/heavy metal (HM) system. Because of the high spin orbit coupling (SOC) these HMs exhibit short spin diffusion length and therefore possess challenges for device application. Low SOC (elements of light weight) and large spin diffusion length make the organic semiconductors (OSCs) suitable for future spintronic applications. From theoretical model it is explained that, due to $\pi$ - $\sigma$ hybridization the curvature of the C${}_{60}$ molecules may increase the SOC strength. Here, we have investigated spin pumping and inverse spin hall effect (ISHE) in CoFeB/C${}_{60}$ bilayer system using coplanar wave guide based ferromagnetic resonance (CPW-FMR) set-up. We have performed angle dependent ISHE measurement to disentangle the spin rectification effects for example anisotropic magnetoresistance, anomalous Hall effect etc. Further, effective spin mixing conductance (g${}_{eff}^{\uparrow \downarrow }$) and spin Hall angle (${\theta }_{SH}$) for C${}_{60}$ have been reported here. The evaluated value for ${\theta }_{SH}$ is 0.055.

References in corpus (6)

• Nonlocal magnetization dynamics in ferromagnetic heterostructures
• Spin pumping and magnetization dynamics in metallic multilayers
• Unravelling the role of the interface for spin injection into organic semiconductors
• Measurement of spin pumping voltage separated from extrinsic microwave effects
• Study of spin pumping in Co thin film vis-a-vis seed and capping layer using ferromagnetic resonance spectroscopy
• Enhanced spin-orbit coupling in a heavy metal via molecular coupling