Electrical Detection of the Spin Hall Effects in InAs Quantum Well Structure with Perpendicular Magnetization of [Pd/CoFe] Multilayer

The spin Hall effect was electrically detected in an InAs quantum well structure. The spin Hall device consists of an InAs Hall bar and a Pd/CoFe multilayer electrode which has magnetization perpendicular to the sample plane. Spin polarized electrons injected from the Pd/CoFe electrode have spin orientation perpendicular to the quantum well and cause a charge accumulation at the edge of the InAs channel. In the absence of an external magnetic field, a large spin Hall resistance, 9.3 mΩ, is observed and the spin Hall angle is found to be ~ 0.01. The dominant mechanism is believed to side-jump scattering.