Comprehensive Demonstration of Spin Hall Hanle Effects in Epitaxial Pt Films

We demonstrate a nonlinear Hall effect due to the boundary spin accumulation in Pt films grown

on Al₂O₃ substrates. This Hall effect and the previously demonstrated Hanle magnetoresistance

provide a complete picture of the spin-precession control of the spin and charge transport at the

boundary of a spin-orbit coupled material, which we refer to as spin-Hall Hanle effects (SHHE).

We also show that the SHHE can be employed to measure the spin diffusion length, the spin-

Hall angle, and the spin relaxation time of heavy metal without the need of magnetic interface or

the input from other measurements. The comprehensive demonstration of SHHE in such a simple

system suggests they may be ubiquitous and needs to be considered for unravelling the spin and

charge transport in more complex thin film structures of spin-orbit coupled materials.