Abstract
The onset of ferrimagnetic spin moment is investigated on the itinerant-electron model for compounds composed of magnetic and non-magnetic transition-metal atoms. The d-states of non-magnetic atoms mix with those of the magnetic atoms. In the magnetic state the strength of the d-d mixing is different in the majority and minority spin bands and then the magnetic moment on non-magnetic atom is induced. By using a two-band model, the induced moment on the non-magnetic atoms is shown explicitly to align in either the parallel or antiparallel direction to that of the magnetic atoms, depending on the value of intra-atomic Coulomb integral on the magnetic atom.
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