mriselMagnetic Resonance in SolidsMagnetic Resonance in Solids2072-5981Kazan Federal Universitymrisel-189Research ArticleСтатьиTemperature Effects in the FMR spectra of Magnetic Nanoparticles Dispersed in Polymer Film and Viscous FluidKovarskiA. L.

Kosygin Str., 4, Moscow 119334

alkov44@gmail.comBychkovaA. V.

Kosygin Str., 4, Moscow 119334

SorokinaO. N.

Kosygin Str., 4, Moscow 119334

KasparovV. V.

Kosygin Str., 4, Moscow 119334

Emanuel Institute of Biochemical Physics, RASRussian Federation2008200120241012530Copyright © Kovarski A.L., Bychkova A.V., Sorokina O.N., Kasparov V.V., 20242024Kovarski A.L., Bychkova A.V., Sorokina O.N., Kasparov V.V.Kovarski A.L., Bychkova A.V., Sorokina O.N., Kasparov V.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.mrsej.ru/jour/article/view/189

Temperature dependences of ferromagnetic resonance spectra of nanoparticles of magnetite dispersed in polyethylene glycol films and nickel in vaseline oil have been studied. Sharp changes in spectra position (g-value) and linewidth have been found for both systems in the temperature interval 60 - 100 K above glass transition point. These effects have not been observed for polyethylene glycol films prepared under external magnetic field. It has been shown that the effects observed are connected with formation of anisotropic aggregates from nanoparticles under magnetic field action. The main factors determining the temperature of spectra parameters changes are the matrix viscosity, particles translational mobility and spectrum sweeping time.

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The authors declare that there are no conflicts of interest present.