METHOD FOR PRODUCING GLASSY MAGNETIC COMPOSITE MATERIALS (GMCM) WITH TWO MAGNETIC SUBSYSTEMS (FeO/MnO) Russian patent published in 2023 - IPC C03C23/00 C03C17/25 B82Y40/00 B82Y30/00 

FIELD: magnetic materials.

SUBSTANCE: magnetic materials processing with two magnetic subsystems based on magnetite-containing porous glasses doped with manganese oxides, which can be used as magnetic carriers in demand in microelectronics and selective catalysis. The claimed method includes the creation of magnetite-containing high-silica nanoporous glasses (NPG matrices) and the formation of manganese oxides Mn_xO_y, where x=1, 2, 3; y=1, 2, 3, 4, in the pore space of these matrices by their successive impregnation in aqueous solutions of manganese chloride MnCl₂ and oxalic acid H₂C₂O₄ with intermediate drying in air sequentially at 20° C and 50° C. During the subsequent heat treatment of samples in a nitrogen atmosphere at 300° C, the product of the interaction of MnCl₂ and H₂C₂O₄ - manganese oxalate (MnC₂O₄) decomposes to the formation of manganese oxides in different oxidation states: MnO, MnO₂, Mn₂O₃, Mn₃O₄.

EFFECT: production of glassy magnetic composite materials in the form of plates of thickness≤ 1.5 mm with two magnetic subsystems, determined by the presence of magnetite in the framework of NPG matrices and manganese oxides in the pore space of NPG matrices, which have the characteristics of a magnetic state at 293 K: coercive force Hc ~ 18 kA/m, remnant magnetization M_r, ~ 2.5 em.un./g, saturation magnetization M_s =10.3 em.un./g.

2 cl, 4 dwg, 3 tbl, 1 ex