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The new method of the nanoparticle log-normal distribution parameters determination for superparamagnetic nanoparticle system of core-shell type is proposed. It is based on measurements of the nonlinear magnetic susceptibility and is compared with other commonly used techniques.
In this communication we analyze the reasons for distinctions of Yb2+ → Yb3+ recharging processes taking place in Yb:Y3Al5O12 epitaxial films and bulk crystals under high temperature annealing. Influence of sample surface structure on the rate of oxidation process was found to be significant.
It is shown in this work that the observed stripe-like magnetic domain structure in epitaxial iron garnet films possessing small uniaxial magnetic anisotropy cannot be explained as equilibrium stripes divided by 180° domain walls and can be described by the composite domain structure of two-level organization, that consists of stripe-like micro-domains and larger macro-domains and has lower total...
Pure and doped lithium niobate (LiNbO3) crystals heat treated at temperatures up to 1000°C under reduced/oxidized atmospheres were studied through normal incidence transmission ellipsometry in which a laser with a wavelength of 632.8 nm was employed. The differences in refractive indices between two orthogonal directions were calculated. Results show that the birefringence varies depending on thermal...
Research on holographic data storage has been carried out by using continuous wave laser at 632.8. The erasure time constants for continuous readout have been determined. Defect structures of congruent lithium niobate crystal heat-treated at high temperature were identified by optical absorption spectroscopy and the effect of defect bands modified by high temperature heat treatment on the continuous...
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