The heating of magnetic nanoparticles in a rotating magnetic field

ABSTRACT

The specific absorption rate of magnetic nanoparticles in a rotating magnetic field has been calculated taking into account both thermal fluctuations of the particle magnetic moments and strong magneto-dipole interactions in nanoparticle clusters with various filling factors. For an assembly of interacting superparamagnetic nanoparticles, the maximal values of the specific absorption rate in a rotating magnetic field are found to be 30–40% greater than that in alternating magnetic field. In addition, for the given filling factor and magnetic field amplitude in rotating magnetic field the nanoparticles in a wider range of diameters can effectively contribute to the energy absorption process. Therefore, the use of rotating magnetic field seems preferable in magnetic nanoparticle hyperthermia.

KEYWORDS:

• Magnetic nanoparticles
• rotating magnetic field
• magneto- dipole interaction
• specific absorption rate
• numerical simulation

Acknowledgments

Authors gratefully acknowledge the financial support of the Ministry of Science and Higher Education of the Russian Federation in the framework of Increase Competitiveness Program of NUST «MISIS», contract № K2-2017-008.

Author Contributions

N.A. designed the numerical simulation scheme. O.N. and E.G. carried out the numerical simulations. N.A. and E.G. analyzed the numerical simulation data obtained. O.N. and E.G. designed and prepared all figures. All authors participating in the writing of the manuscript.

Competing financial interests

The authors declare no competing financial interests.

Additional information

Funding

This work was supported by the Ministry of Science and Higher Education of the Russian Federation [K2-2017-008].