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Spin pumping is a technique widely used to generate the pure spin current andcharacterize the spin-charge conversion in various systems. The reversing signof the symmetric Lorentzian charge current with respect to opposite magneticfield is generally accepted as the key criterion to identify its pure spincurrent origin. However, we herein find that the rectified voltage due to theplanar Hall effect can exhibit similar spurious signal, complicating and evenmisleading the analysis. The distribution of microwave magnetic field andinduction current has strong influence on the magnetic field symmetry andlineshape of the obtained signal. We further demonstrate a geometry where thespin-charge conversion and the rectified voltage can be readily distinguishedwith a straightforward symmetry analysis.

Planar Hall effect induced spin rectification effect and its strong impact on spin pumping measurements