  We study the magnon transport in the nonlocal configuration composed of two
Pt strips on top of yttrium iron garnet, with and without the presence of RF
microwave generated by an on-chip antenna. We find that the spin-Hall induced
thermal magnon heating/cooling, the Oersted field as well as the Joule heating
generated by the a.c. current in the Pt injector can significantly influence
the spin-pumping signal measured by the Pt detector in the presence of RF
microwave, forcing the spin-pumping voltage to show up in the first and second
harmonic signals in the nonlocal magnon transport measurement. These results
indicate that nonlocal magnon transport configuration can serve as a structure
to electrically detect and manipulate the spin-pumping signal. Furthermore,
certain caution is needed when studying the interplay between incoherent magnon
and coherent magnon spin transport in the nonlocal transport configuration,
since the change in microwave-induced spin-pumping voltage can overwhelm the
incoherent magnon transport signals.
