Nonlocal electrical detection of spin accumulation generated by Anomalous Hall effects in mesoscopic Ni_81Fe_19 films

Abstract

Spin accumulation generated by the anomalous Hall effects (AHE) in mesoscopic ferromagnetic Ni81Fe19 (permalloy or Py) films is detected electrically by a nonlocal method. The reciprocal phenomenon, inverse spin Hall effects (ISHE), can also be generated and detected all-electrically in the same structure. For accurate quantitative analysis, a series of nonlocal AHE/ISHE structures and supplementary structures are fabricated on each sample substrate to account for statistical variations and to accurately determine all essential physical parameters in-situ. By exploring Py thicknesses of 4 nm, 8 nm, and 12 nm, the Py spin diffusion length λ_Py is found to be much shorter than the film thicknesses. The product of λ_Py and the Py spin Hall angle α_SH is determined to be independent of thickness and resistivity: α_SH*λ_Py= (0.066 +/- 0.009) nm at 5 K and (0.041 +/- 0.010) nm at 295 K. These values are comparable to those obtained from mesoscopic Pt films.

References in corpus (9)

• Spin Hall effect
• Magnetic switching by spin torque from the spin Hall effect
• Spin Torque Ferromagnetic Resonance Induced by the Spin Hall Effect
• Direct electronic measurement of the spin Hall effect
• Room Temperature Reversible Spin Hall Effect
• Quantifying spin Hall angles from spin pumping: Experiments and Theory
• Evolution of the spin Hall effect in Pt nanowires: Size and temperature effects
• Spin Hall effects in mesoscopic Pt films with high resistivity
• Spin-Orbit Coupling of Conduction Electrons in Magnetization Switching

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• Large Spin Anomalous Hall Effect in L1${}_0$-FePt: Symmetry and Magnetization Switching
• Giant bulk spin-orbit torque and efficient electrical switching in single ferrimagnetic FeTb layers with strong perpendicular magnetic anisotropy
• Efficient injection and detection of out-of-plane spins via the anomalous spin Hall effect in permalloy nanowires
• All-electrical Magnon Transport Experiments in Magnetically Ordered Insulators
• Enhancement of Spin-Charge Conversion Efficiency for Co${}_3$Sn${}_2$S${}_2$ across Transition from Paramagnetic to Ferromagnetic Phase
• Theoretical Study of Extrinsic Spin-current Generation in Ferromagnets Induced by Anisotropic Spin-flip Scattering
• Spin-Orbit Torque in a Single Ferromagnetic Layer with Large Spin-Orbit Coupling
• Perpendicularly Polarized Spin Hall Effects Induced by Spin-Dependent Scattering in Ferromagnetic Metals
• Measuring the magnetic anisotropy of the spin Hall effect and spin relaxation length in nickel and permalloy via electrical spin injection