In Py/Pt bilayers a magnon-related spin-flip unidirectional magnetoresistance appears in second-harmonic Hall data and must be included to obtain reliable spin-orbit torque values over broad field ranges.
It can also include an inclination, so that when the chip is rotated in the magnet at nominally θH = π/2, a small, φH-dependent Hz field appears
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Impact of current-induced magnons on spin-orbit torque analysis
In Py/Pt bilayers a magnon-related spin-flip unidirectional magnetoresistance appears in second-harmonic Hall data and must be included to obtain reliable spin-orbit torque values over broad field ranges.