FMR study of superparamagnetic Ni particles with weak and strong magnetic anisotropy

  • M. M. Yulikov
  • P. A. Purtov


The method of ferromagnetic resonance (FMR) was used to study the process of thermal decomposition of the layered double hydroxides of lithium-aluminum and nickel-aluminum with intercalated EDTA complexes of nickel. The magnetic resonance spectra of nickel superparamagnetic nanoparticles were recorded at two temperatures (300 and 77 K). A computer simulation of FMR spectra was based on a modified statistic model which assumes the resonance of single-domain particles randomly oriented in an amorphous matrix. It is suggested that the line of the magnetic resonance of superparamagnetic particles narrows due to effects similar to those of dynamic narrowing in electron spin resonance and nuclear magnetic resonance spectra. In the framework of the model used, a fairly good agreement was achieved between calculated and experimental data. The formation of the two types of particles with strong (about 2·106 erg/cm3) and weak (about 2·105 erg/cm3) effective magnetic anisotropy was established.


Magnetic Anisotropy Layered Double Hydroxide Nickel Particle Superparamagnetic Particle Electron Spin Reso 
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Copyright information

© Springer 2005

Authors and Affiliations

  1. 1.Boreskov Institute of CatalysisRussian Academy of SciencesNovosibirskRussian Federation
  2. 2.Institute of Chemical Kinetics and CombustionRussian Academy of SciencesNovosibirskRussian Federation

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