Ferri-magnetic pyrrotites in a metastable condition

It is investigated the magnetic properties of Ferrous sulphides in a metastable phase condition. Ferrous sulphides with composition Fe7S8, decrease of magnetization practically to a zero when hardening with the temperature of synthesis. It is shown that the observed effect is explained not only by the redistribution of the vacancies of iron ions in a basic plane of the crystalline structure of the type NiAs, but by the processes of the spin flip on the node. There offered a theoretical model explaining this phenomenon qualitatively.