  We conducted a systematic angular dependence study of nonlinear
magnetoresistance in NiFe/Pt bilayers at variable temperature and field using
the Wheatstone bridge method. We successfully disentangled magnon
magnetoresistance from other types of magnetoresistances based on their
different temperature and field dependences. Both the spin Hall/anisotropic and
magnon magnetoresistances contain sine phi and sine 3 phi components with phi
the angle between current and magnetization, but they exhibit different field
and temperature dependence. The competition between different types of
magnetoresistances leads to a sign reversal of sine 3 phi component at a
specific magnetic field, which was not reported previously. The
phenomenological model developed is able to account for the experimental
results for both NiFe/Pt and NiFe/Ta samples with different layer thicknesses.
Our results demonstrate the importance of disentangling different types of
magnetoresistances when characterizing the charge-spin interconversion process
in magnetic heterostructures.
