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

Mesoscale and Nanoscale Physics;Materials Science;Other Condensed Matter