Studying the Ferromagnetic Resonance Heating of an Isotropic Superparamagnet by the Example of Biogenic Ferrihydrite Nanoparticles

Stolyar, S.V., Li, O.A., Vorotynov, A.M., (...), Ladygina, V.P., Shokhrina, A.O.// Bulletin of the Russian Academy of Sciences: Physics//

Ferrihydrite nanoparticles are synthesized and characterized. The dependences of heating of powders are studied upon pumping by a high-frequency electromagnetic field on a dc magnetic field. It is shown that the experimental dependence of the temperature of particles on a dc magnetic field is consistent with the theory of ferromagnetic resonance for an isotropic superparamagnet.