Surface-assisted Spin Hall Effect in Au Films with Pt Impurities

Abstract

We show, both experimentally and theoretically, a novel route to obtain giant room temperature spin Hall effect due to surface-assisted skew scattering. In the experiment, we report the spin Hall effect in Pt-doped Au films with different thicknesses $t_N$. The giant spin Hall angle ${\gamma }_S$ = $0.12\pm 0.04$ is obtained for $t_N$ = 10 nm at room temperature, while it is much smaller for $t_N$ = 20 nm sample. Combined ab initio and quantum Monte Carlo calculations for the skew scattering due to a Pt impurity show ${\gamma }_S$ $\cong$ 0.1 on the Au (111) surface, while it is small in bulk Au. The quantum Monte Carlo results show that the spin-orbit interaction of the Pt impurity on the Au (111) surface is enhanced, because the Pt 5d levels are lifted to the Fermi level due to the valence fluctuation. In addition, there are two spin-orbit interaction channels on the Au (111) surface, while only one in bulk Au.

4 pages, 2 figures

References in corpus (3)

• Negative nonlocal resistance in mesoscopic gold Hall bars: Absence of giant spin Hall effect
• Enhanced spin Hall effect by resonant skew scattering in orbital-selective Kondo effect
• Quantum Renormalization of the Spin Hall Effect

Cited by in corpus (28)

• Spin torque switching with the giant spin Hall effect of tantalum
• Spin Torque Ferromagnetic Resonance Induced by the Spin Hall Effect
• Giant Spin Hall Effect Induced by Skew Scattering from Bismuth Impurities inside Thin Film CuBi Alloys
• Extrinsic Spin Hall Effect Induced by Iridium Impurities in Copper
• 5d transition metal oxide IrO2 as a material for spin current detection
• Extrinsic spin Hall effects measured with lateral spin valve structures
• Origin of inverse Rashba-Edelstein effect at Cu/Bi interface using lateral spin valves
• Relation between spin Hall effect and anomalous Hall effect in 3$d$ ferromagnetic metals
• Scattering theory of spin-orbit active adatoms on graphene
• Determination of the spin Hall angle in single-crystalline Pt films from spin pumping experiments
• Spin orbit coupling controlled spin pumping effect
• Microscopic mechanism of high-temperature ferromagnetism in Fe, Mn, and Cr-doped InSb, InAs, and GaSb magnetic semiconductors
• On the origin of the giant SHE in Cu(Bi) alloys
• Anomalous spin precession and spin Hall effect in semiconductor quantum wells
• Spin-Hall Conductivity and Electric Polarization in Metallic Thin Films
• Diluted magnetic semiconductors with narrow band gaps
• Sign change of the spin Hall effect due to electron correlation in nonmagnetic CuIr alloys
• Hall detection of a ppm spin polarization
• Critical spin fluctuation mechanism for the spin Hall effect
• Enhanced Inverse Spin-Hall Effect in Ultrathin Ferromagnetic/Normal Metal Bilayers
• New p- and n-type ferromagnetic semiconductors: Cr-doped BaZn2As2
• Influence of spin-orbit and spin-Hall effects on the spin Seebeck current beyond linear response
• Enhanced Magneto-optical Kerr Effect at Fe/Insulator Interfaces
• Enhanced spin Hall effect by electron correlations in CuBi alloys
• Mechanism of Spin-Orbit Torques in Platinum Oxide Systems
• Calculating interface transport parameters at finite temperatures: Nonmagnetic interfaces
• Large Spin-to-Charge Conversion in Ultrathin Gold-Silicon Multilayers
• Orbital-selective conductance of Co adatom on the Pt(111) surface