Nonlinear Resonant and Chaotic Dynamics in Microwave Assisted Magnetization Switching

TitleNonlinear Resonant and Chaotic Dynamics in Microwave Assisted Magnetization Switching
Publication TypeJournal Articles
Year of Publication2009
Authorsd'Aquino M, Serpico C, Bertotti G, Mayergoyz ID, Bonin R
JournalMagnetics, IEEE Transactions on
Pagination3950 - 3953
Date Published2009/10//
ISBN Number0018-9464
Keywordsamplitude;chaotic, components;magnetic, dynamical, dynamics;coercive, dynamics;numerical, field, field;coercivity;linearly-polarized, force;magnetic, magnetization, nanoparticle;microwave-assisted, particles;magnetic, radiofrequency, resonant, RF, simulations;perturbation, switching;nanoparticles;nonlinear, switching;nonlinear, systems;perturbation, technique;chaos;coercive, theory;

The switching process of a uniformly magnetized magnetic nanoparticle is considered. The particle is subject to applied fields having both dc and linearly-polarized radio-frequency (RF) components. The possibility of using the RF power to obtain a reduced coercivity of the particle is related to the onset of chaotic magnetization dynamics for moderately low values of the RF field amplitude. Perturbation technique for the evaluation of the reduced coercive field is developed and applied to the microwave assisted switching of the particle. Numerical simulations confirm the predictions of the theory.