Negative nonlocal resistance in mesoscopic gold Hall bars: Absence of giant spin Hall effect

Abstract

We report the observation of negative nonlocal resistances in multiterminal mesoscopic gold Hall bar structures whose characteristic dimensions are larger than the electron mean-free path. Our results can only be partially explained by a classical diffusive model of the nonlocal transport, and are not consistent with a recently proposed model based on spin Hall effects. Instead, our analysis suggests that a quasiballistic transport mechanism is responsible for the observed negative nonlocal resistance. Based on the sensitivity of our measurements and the spin Hall effect model, we find an upper limit for the spin Hall angle in gold of 0.022 at 4.5 K.

4 pages, 5 figures

References in corpus (4)

• Direct electronic measurement of the spin Hall effect
• Electrical Detection of Spin Transport in Lateral Ferromagnet-Semiconductor Devices
• Enhanced spin Hall effect by resonant skew scattering in orbital-selective Kondo effect
• Long-range nonlocal flow of vortices in narrow superconducting channels

Cited by in corpus (4)

• Temperature dependence of spin diffusion length and spin Hall angle in Au and Pt
• Spin Hall Angle Quantification from Spin Pumping and Microwave Photoresistance
• Spin transport parameters of NbN thin films characterised by spin pumping experiments
• The role of exchange interaction in nitrogen vacancy centre-based magnetometry