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The autoresonant approach to excitation and control of large amplitudeuniformly precessing magnetization structures in finite length easy axisferromagnetic nanoparticles is suggested and analyzed within theLandau-Lifshitz-Gilbert model. These structures are excited by using aspatially uniform, oscillating, chirped frequency magnetic field, while thelocalization is imposed via boundary conditions. The excitation requires theamplitude of the driving oscillations to exceed a threshold. The dissipationeffect on the threshold is also discussed. The autoresonant driving effectivelycompensates the effect of dissipation, but lowers the maximum amplitude of theexcited structures. Fully nonlinear localized autoresonant solutions areillustrated in simulations and described via an analog of a quasi-particle inan effective potential. The precession frequency of these solutions iscontinuously locked to that of the drive, while the spatial magnetizationprofile approaches the soliton limit when the length of the nanoparticle andthe amplitude of the excited solution increase.

Narrow autoresonant magnetization structures in finite length ferromagnetic nanoparticles