A Spin-Current Detector Based on the Inverse Spin Hall Effect in a Platinum Strip with Computed Voltage Sensitivity

Spin currents carry angular momentum without net charge flow, and in a torsion-sourced framework they are also the form in which spin information moves between a source and a sensor. Detecting them electrically is done through the inverse spin Hall effect, which converts a spin current into a transverse voltage in a heavy metal. This paper specifies a detector on that principle, a platinum strip one hundred micrometres long, and computes its full sensitivity chain: a responsivity of 3.20e-04 volts per unit of charge-equivalent spin current density, a strip resistance of 400 ohms, a Johnson noise of 2.54e-09 volts per root hertz, and hence a minimum detectable spin current density of 7.95e-06 amperes per square metre per root hertz. A spin current density of one ampere per square metre produces 320 microvolts. SIMULATED, NOT MEASURED: all figures are computed from stated assumptions.