Formation of CuCr2Se4 ferromagnetic spinel microcrystals in a chalcogenide glass matrix

Abstract

Crystals of the CuCr 2 Se 4 ferromagnetic spinel and spinel-based solid solutions are shown to form in glass-forming alloys of the Cu 2 Se-As 2 Se 3 -Cr 2 Se 3 -Se system containing Cr 2 Se 3 at a content greater than 0.005 mole fractions. The crystalline phases are identified by the magnetochemical method (from the Curie temperatures) and X-ray diffraction analysis. According to electron microscopy, the crystal sizes are equal to several micrometers. IR irradiation of the samples in a magnetic field leads to an increase in the magnetization. The excess magnetization disappears after the external magnetic field is removed.

Preparation and properties of CuCr2Se4 ferromagnetic spinel nanocrystals

“…The choice of the radiation wavelength was motivated by the following circumstances. One of the methods for preparing finely dispersed CuCr 2 Se 4 spinel crystals consists in forming this spinel in a matrix of glasses in the Cu 2 Se-As 2 Se 3 system [21].…”

Transparent chalcogenide glass-ceramics

“…First, Tver'yanovich et al demonstrated in 2005 the possibility to generate CuCr 2 Se 4 ferromagnetic spinel microcrystals in a Cu 2 Se-as 2 Se 3 -Cr 2 Se 3 glassy system (Tver'yanovich et al, 2005). While no information is given on the infrared transparency of the glass-ceramics, it is interesting to note that when samples are placed in a magnetic field and irradiated by an IR source, an increase of the magnetization is observed.…”