TRANSPARENT FERROMAGNETIC COMPOUND CONTAINING NO MAGNETIC IMPURITY SUCH AS TRANSITION METAL OR RARE EARTH METAL AND FORMING SOLID SOLUTION WITH ELEMENT HAVING IMPERFECT SHELL, AND METHOD FOR ADJUSTING FERROMAGNETIC CHARACTERISTICS THEREOF

摘要

A single crystalline transparent ferromagnetic compound which transmits a light and also has high ferromagnetic characteristics, characterized in that it is a compound selected from the group of an alkaline earth chalcogenide, an alkali calcogenide, a I-VII Group compound, a II-VI Group compound, a III-V Group compound, a IV-VI2 Group compound, a IV-IV Group compound and a II-VII2 Group compound, and forms a solid solution with at least one element having an imperfect p electron shell as an outermost shell, such as B, C, N, O, F, Si and Ge, to thereby have a ferromagnetism transition temperature of room temperature or higher. Ferromagnetic characteristics of the above ferromagnetic compound are adjusted by controlling valence electrons through the adjustment of the concentration of the element having an imperfect p electron shell as an outermost shell, the addition of an acceptor and a donor, and the like.