Formation of CuCr₂Se₄ Ferromagnetic Spinel Microcrystals
in a Chalcogenide Glass Matrix

Yu. S. Tver’yanovich, D. S. Kim, A. N. Rusnak, E. Yu. Turkina, and A. A. Korzinin

Research Institute of Laser Technologies, St. Petersburg State University,
Ul’yanovskaya ul. 5, Petrodvorets, 198504 Russia

Received September 16, 2004

Abstract—Crystals of the CuCr₂Se₄ ferromagnetic spinel and spinel-based solid solutions are shown to form
in glass-forming alloys of the Cu₂Se–As₂Se₃–Cr₂Se₃–Se system containing Cr₂Se₃ 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.

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