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Bipolar magnetic semiconductors are a special class of magnetic semiconductors characterized by a unique electronic structure, where valence band maximum and conduction band minimum are fully spin polarized in the opposite spin direction. BMSs can be described by three energy gaps, the spin-flip gap Δ2 in valence band , band gap Δ1 and spin-flip gap Δ3 in conduction band. Up to now, bipolar magnetic semiconductors, together with half-metal and spin gapless semiconductor, have been viewed as three important classes of spintronic materials.
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