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We investigate the influence of the domain wall ferromagnetic resonancefrequency on the spin transfer torque in a ferromagnetic nanowire. By employingmicromagnetic simulations with the spin transfer torque, we find that thedomain wall resonance frequency decreases with increasing spin polarizedcurrent density, when there is no change in the resonance frequency of thedomain itself. Surprisingly, the variation of the resonance frequency isremarkable (> 1.6 GHz) with the spin transfer torque even though the domainwall is pinned. Since the presented domain wall ferromagnetic resonance studyhas been performed for the pinned domain wall, the contributions of extrinsicdefects are excluded. It is strong advantages of the present study, since theeffects of extrinsic pinning sites are inevitable in the imaging or transportmeasurements.

Effect of spin transfer torque on the magnetic domain wall ferromagnetic resonance frequency in the nanowires