2020   04   az   p.13-21 Sh.N. Aliyeva,
The optical properties of granulated Ni1-xZnxFe2O4nanofilms		  pdf 

ABSTRACT

Granular Ni0.4Zn0.6Fe2O4 nanofilms on the glass substrate are obtained by melting submicron ferrimagnetic particles with a laser radiation. It is established that, the magnitude and mutual orientation of external magnetic and domain fields accelerate the melting of particles, their unification into drops, the flat "bottoms" of which indicate good wetting of the glass substrate. In the obtained films, the shapes of the granules are not spherical, the average distance between the granules is in the order of their sizes, and thus, it is possible to observe giant magneto-transport properties in films. In a system of single-domain particles, all magnetic moments are coaxial and rotate synchronously with the external field as one giant moment, which leads to the appearance of extreme ferromagnetic characteristics. Thus, it is obvious that the created ferrite converters, due to the chosen geometry of the macrostructure, will have specific spatially modulated magnetic and electrical profiles. The investigated luminescence spectra of Ni0.4Zn0.6Fe2O4 nanofilms with one and two-photon excitation confirmed that the nature of the appearance of a strong maximum at 880 cm-1 is associated with the ordering of granules in the nanofilm structure in such a way that all their magnetic moments are coaxial and rotate synchronously with the external field. An analysis of the THz reflection and transmission spectra of nanofilms indicated the presence of a split sequence of acoustic phonon modes, similar to those found in magnetite films, a structural analogue of Ni0.4Zn0.6Fe2O4.

Keywords: ferrite, sublattice, terahertz spectroscopy.
PACS: 41.20Gz;42.72Ai

DOI:-

Received: 28.10.2020

AUTHORS & AFFILIATIONS

Institute of Physics of Azerbaijan National Academy of Sciences, 131 H. Javid ave, Baku, AZ-1143, Azerbaijan
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