Specific absorption rate of randomly oriented magnetic nanoparticles in a static magnetic field

Submitting author affiliation:
National University of Science and Technology «MISiS», Moscow, Russian Federation

Beilstein Arch. 2022, 202291. https://doi.org/10.3762/bxiv.2022.91.v1

Published 15 Dec 2022

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The numerical simulation using the stochastic Landau-Lifshitz equation is performed to study magnetization dynamics of a dilute assembly of iron oxide nanoparticles subjected to a low-frequency alternating (ac) magnetic field with an amplitude Hac = 200 Oe and a frequency f = 300 kHz and a static (dc) magnetic field in the range Hdc = 0 – 800 Oe. The specific absorption rate of the assembly is calculated depending on the angle between the directions of the ac and dc magnetic fields. For the case of inhomogeneous dc magnetic field created by two opposite magnetic fluxes, the spatial distribution of SAR in the vicinity of the field-free point is obtained for assemblies with different nanoparticle size distributions. The results obtained seem to be helpful for the developing promising magnetic nanoparticle imaging and magnetic hyperthermia joint technique.

Keywords: Magnetic nanoparticles, Low frequency hysteresis loop, Specific absorption rate, Static magnetic field, Magnetic hyperthermia, Magnetic particle imaging

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Rytov, R. A.; Usov, N. A. Beilstein Arch. 2022, 202291. doi:10.3762/bxiv.2022.91.v1

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