The Peculiarities of Electron Paramagnetic and Nuclear Magnetic Resonance Spectra in Nanoferroics

7 The Peculiarities of Electron Paramagnetic and Nuclear Magnetic Resonance Spectra in Nanoferroics 

As it was pointed out earlier, all the properties of nanoferroics are inhomogeneous due to the influence of the surface, where the properties are different from those in the bulk. Due to this the investigations of local physical properties can be 

Here we consider the EPR and NMR spectra of oxide nanomaterials in the form of nanopowders and nanogranular ceramics on the base of the results obtained in Refs. [100-102]. 

1 Magnetic Resonance Spectra in the Core and Shell Model of Ferroic Nanoparticle 

We begin with consideration of surface influence on resonance magnetic Adds for spherical nanoparticles. This influence defines the positions of corresponding spectral lines. As it was shown in the Sect. 3.1, the surface effect can be expressed via hydrostatic pressure p = 2 [l/R, where R is a particle radius and p, is a surface tension coefficient. It is known, that the influence of mechanical stress on resonant fields (frequencies) is defined by spin-phonon interaction coefficients. Therefore, the resonance frequency of some transition for nanoparticles can be expressed in the form  

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