TY CONF TI THE DEPENDENCE OF THE COERCIVE FORCE OF THE FIELD ANISOTROPY IN HEXAFERRITE KW coercive force KW hexaferrite JO XXIV international conference "Electromagnetic field and materials (fundamental physical research)" AU Flanden, V.S. AU Kolodin, P.S. PY 2026 PB INFRA-M Academic Publishing LLC.