Microwave spectra of ZnFe2O4, CoFe2O4, and Fe3O4 nanoparticles suspended with mono-, tri-, and polyethylene glycol

In this paper changes in the spectrum of ferromagnetic resonance have been studied experimentally, as the space among magnetic nanoparticles is varied. The variation in the space among magnetic nanoparticles has been carried out by preparing suspensions of nanoparticles with ethylene glycols of different lengths of molecules. The spectral narrowing of the ferromagnetic resonance is revealed with increasing spaces between magnetic nanoparticles. This effect concerns the decrease in the dipolar interaction among magnetic nanoparticles, as the length of the ethylene glycol molecule is increased. Our research makes the certain contribution to the development of techniques of materials design with prescribed magnetic properties as well as they can be useful in medical investigations of cancer. © 2016 by Begell House, Inc.