Abstract
A set of equations in the Gilbert form that describes the motion of the magnetization vector in an ensemble of interacting magnetic nanoparticles is numerically solved for the case of high-amplitude rf pulses. Based on the numerical solution, the magnetic structure of spherical particle ensembles showing cubic anisotropy at certain parameters of the variable field is studied. This phenomenon is shown to have a threshold. The dependence of the field threshold amplitude on the acting pulse repetition rate and amount of magnetic interaction is determined. It is demonstrated that a change in the magnetic structure of the interacting particle ensembles causes a change in the spectrum of the response. This fact can be used for pulsed rf writing and readout of information based on ferromagnetic resonance.
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Original Russian Text © L.N. Kotov, L.S. Nosov, F.F. Asadullin, 2008, published in Zhurnal Tekhnicheskoĭ Fiziki, 2008, Vol. 78, No. 5, pp. 60–65.
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Kotov, L.N., Nosov, L.S. & Asadullin, F.F. Variation in the magnetic structure of a single-domain particle ensemble and its response to an rf pulse. Tech. Phys. 53, 592–596 (2008). https://doi.org/10.1134/S1063784208050101
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DOI: https://doi.org/10.1134/S1063784208050101