TY - JOUR T1 - Nonlinear Resonant and Chaotic Dynamics in Microwave Assisted Magnetization Switching JF - Magnetics, IEEE Transactions on Y1 - 2009 A1 - d'Aquino,M. A1 - Serpico,C. A1 - Bertotti,G. A1 - Mayergoyz, Issak D A1 - Bonin,R. KW - amplitude;chaotic KW - components;magnetic KW - dynamical KW - dynamics;coercive KW - dynamics;numerical KW - field KW - field;coercivity;linearly-polarized KW - force;magnetic KW - magnetization KW - nanoparticle;microwave-assisted KW - particles;magnetic KW - radiofrequency KW - resonant KW - RF KW - simulations;perturbation KW - switching;nanoparticles;nonlinear KW - switching;nonlinear KW - systems;perturbation KW - technique;chaos;coercive KW - theory; AB - 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. VL - 45 SN - 0018-9464 CP - 10 M3 - 10.1109/TMAG.2009.2023242 ER -