We reported magnetooptical properties of Tb in single crystals of Tb Fe O and Tb Ga O for ion occupying sites of symmetry in the garnets structure. It is shown that in the employed Voigt geometry the magnetic linear birefringence and the dichroism reach values -, and have a strong dependence on the wavelength and a strong anisotropy. The absorption spectra were obtained at temperatures of 30 K, 82 K, 100 K using magnetic field up to 25 kOe applied parallel and perpendicular to the electric vector linearly polarized light on the F F and F F optical transitions region. The aim of this research was revealing of a role of contributions of exchange interaction and a crystal field in splitting of energy levels of the basic condition F ion Tb multiplet in Tb ferrite-garnet by studying of character of spectra of magnetic linear dichroism (MLD) paramagnetic and ferrimagnetic crystals placed in an external magnetic field. Moreover, the assumption about nonreciprocity of magnetic linear birefringence (MLB) spectra and dichroism with the change of the relative orientation of the magnetization vector and the light wave vector has been experimentally confirmed. This effect may be used as a base for the design of the different transducers, for example, magnetooptical optical channels commutator.

Rare earth iron garnets with narrow ferromagnetic resonance linewidths, very low hysteresis losses, and excellent dielectric properties have been widely applied in microwave devices in a wide range of frequencies (1100 GHz), magnetooptical transducers and typically employed as magnetic recording media [1-1. The rare earth iron garnets which can be described by chemical unit formulaRE3Fe5O12belong to cubic system with space groupIa3̄d, whose cell contains eightRE3Fe5O12molecules and crystal lattice contains three crystallographic sites, dodecahedral site 24c{RE3+}, octahedral site 16a[Fe3+] and tetrahedral site 24d(Fe3+). The garnet in fact does not allow distortion to lower symmetry owing to its non-efficiently packed structure, which makes iron garnet structure become unstable with increasing rare earth ionic radius.

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In this paper we present an experimental study of migration of atoms and molecules of the substrate material in the thickness of the film in the direction of the surface by means of laser desorption mass spectrometry. The method is based on the time-of-flight principle of particle detection, desorbed from the sample surface by a laser pulse (LP) of nanosecond duration [. The main advantage of TOF mass spectrometer is that the registration of product desorption is carried out at the site of direct flight from the sample to the ion source, i. e. in the mass spectrum does not participate particle, reflected from the walls and other elements. In addition, the method allows to measure the time delay of the particles emission, relative to the exciting laser irradiation [.

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