Temperature Effects in the FMR spectra of Magnetic Nanoparticles Dispersed in Polymer Film and Viscous Fluid
Abstract
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.
Keywords
magnetite nanoparticles,
nickel nanoparticles,
nanoparticles dispersions,
polyethylene glycol films,
vaseline oil,
ferromagnetic resonance,
temperature effects,
nanoparticles aggregation
Supporting agencies: The work was supported by the Russian Foundation for Fundamental Research (Project No 08-04-00632-a).
About the Authors
A. L. Kovarski
Emanuel Institute of Biochemical Physics, RAS
Russian Federation
Russian Federation
Kosygin Str., 4, Moscow 119334
A. V. Bychkova
Emanuel Institute of Biochemical Physics, RAS
Russian Federation
Russian Federation
Kosygin Str., 4, Moscow 119334
O. N. Sorokina
Emanuel Institute of Biochemical Physics, RAS
Russian Federation
Russian Federation
Kosygin Str., 4, Moscow 119334
V. V. Kasparov
Emanuel Institute of Biochemical Physics, RAS
Russian Federation
Russian Federation
Kosygin Str., 4, Moscow 119334
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Review
For citations:
Kovarski A.L., Bychkova A.V., Sorokina O.N., Kasparov V.V. Temperature Effects in the FMR spectra of Magnetic Nanoparticles Dispersed in Polymer Film and Viscous Fluid. Magnetic Resonance in Solids. 2008;10(1):25-30.
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