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This work provides a detailed investigation of the measured in-planefield-swept homodyne-detected ferromagnetic resonance (FMR) spectra of anextended Co/Cu/NiFe pseudo spin valve stack using a nanocontact (NC) geometry.The magnetodynamics are generated by a pulse-modulated microwave current andthe resulting rectified dc mixing voltage, which appears across the NC atresonance, is detected using a lock-in amplifier. Most notably, we find thatthe measured spectra of the NiFe layer are composite in nature and highlyasymmetric, consistent with the broadband excitation of multiple modes.Additionally, the data must be fit with two Lorentzian functions in order toextract a reasonable value for the Gilbert damping of the NiFe. Aided bymicromagnetic simulations, we conclude that (i) for in-plane fields the rfOersted field in the vicinity of the NC plays the dominant role in generatingthe observed spectra, (ii) in addition to the FMR mode, exchange dominated spinwaves are also generated, and (iii) the NC diameter sets the mean wavevector ofthe exchange dominated spin wave, in good agreement with the dispersionrelation.

Homodyne-detected ferromagnetic resonance of in-plane magnetized nano-contacts: composite spin wave resonances and their excitation mechanism