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Spin accumulation generated by the anomalous Hall effects (AHE) in mesoscopicferromagnetic Ni81Fe19 (permalloy or Py) films is detected electrically by anonlocal method. The reciprocal phenomenon, inverse spin Hall effects (ISHE),can also be generated and detected all-electrically in the same structure. Foraccurate quantitative analysis, a series of nonlocal AHE/ISHE structures andsupplementary structures are fabricated on each sample substrate to account forstatistical variations and to accurately determine all essential physicalparameters in-situ. By exploring Py thicknesses of 4 nm, 8 nm, and 12 nm, thePy spin diffusion length {\lambda}_Py is found to be much shorter than the filmthicknesses. The product of {\lambda}_Py and the Py spin Hall angle {\alpha}_SHis determined to be independent of thickness and resistivity:{\alpha}_SH*{\lambda}_Py= (0.066 +/- 0.009) nm at 5 K and (0.041 +/- 0.010) nmat 295 K. These values are comparable to those obtained from mesoscopic Ptfilms.

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