Impact of Cr Insertion Layer on Spin Transport Properties in Co2FeAl/Ta System

Spin pumping is recognized as a cogent method for the generation and injection of spin current from ferromagnetic (FM) to nonmagnetic (NM) (FM/NM) layer. The interface at FM/NM layers plays a vital role in spin transport. In this work, we have systematically investigated the effect of Cr interlayer (IL) thickness on the spin transport in Co₂FeAl(CFA)/Cr/Ta system. We have observed enhancement in the damping parameter with a 2 nm Cr spacer compared to the sample without a spacer layer. The relative spin-mixing conductance in the system is 1.4 times higher in the sample with a spacer layer compared to the reference sample. This is further supported by inverse spin Hall effect measurements. The relative weight of the symmetric to asymmetric component of voltage drop infers the IL dependency of the system. Our study signifies a novel approach to enhance the spin current transport across CFA/Ta system by strategically inserting the Cr interlayer henceforth offering a pathway for improving the efficiency and performance of spintronics devices.