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Title Induced magnetization and power loss for a periodically driven system of ferromagnetic nanoparticles with randomly oriented easy axes
Authors Denysov, Stanislav Ivanovych  
Liutyi, Taras Volodymyrovych  
Lyutyy, Taras Volodymyrovych
Pedchenko, Bohdan Oleksandrovych
Hryshko, Oleksandr Mykolaiovych
Keywords induced magnetization
periodically driven system
Type Article
Date of Issue 2016
URI http://essuir.sumdu.edu.ua/handle/123456789/70788
Publisher American Physical Society
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Citation Induced magnetization and power loss for a periodically driven system of ferromagnetic nanoparticles with randomly oriented easy axes [Текст] / S.I. Denisov, T.V. Lyutyy, B.O. Pedchenko, O.M. Hryshko // Physical Review B. - 2016. - № 94. - 024406. - DOI: 10.1103/PhysRevB.94.024406.
Abstract We study the effect of an elliptically polarized magnetic field on a system of non-interacting, single-domain ferromagnetic nanoparticles characterized by a uniform distribution of easy axis directions. Our main goal is to determine the average magnetization of this system and the power loss in it. In order to calculate these quantities analytically, we develop a general perturbation theory for the Landau-Lifshitz-Gilbert (LLG) equation and find its steady-state solution for small magnetic field amplitudes. On this basis, we derive the second-order expressions for the average magnetization and power loss, investigate their dependence on the magnetic field frequency, and analyze the role of subharmonic resonances resulting from the nonlinear nature of the LLG equation. For arbitrary amplitudes, the frequency dependence of these quantities is obtained from the numerical solution of this equation. The impact of transitions between different regimes of regular and chaotic dynamics of magnetization, which can be induced in nanoparticles by changing the magnetic field frequency, is examined in detail.
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