Abstract
The magnetic properties of cobalt spherical nanoparticles (∼ 5–9 nm in size) in a polymer shell are investigated using ferromagnetic resonance (FMR) spectroscopy. The metal-polymer complex is prepared through the frontal polymerization of the cobalt acrylamide (CoAAm) complex, followed by the thermolysis at a temperature of 643 K. Analysis of the ferromagnetic resonance spectra demonstrates that the material has a high blocking temperature of ∼700 K. The anisotropy constant equal to 0.5 erg/cm3 is somewhat larger than the anisotropy constants characteristic of cobalt macrostructures. This difference is associated with the predominance of the surface anisotropy of nanoparticles. The surface anisotropy constant is calculated to be 0.17 erg/cm2, and the anisotropy field is determined to be ∼350 Oe. It is revealed that the polymer shell affects the magnetic properties of nanoparticles.
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