 Bipolar magnetic semiconductor

Bipolar magnetic semiconductors (BMSs) are a special class of magnetic semiconductors characterized by an unique electronic structure, where valence band maximum (VBM) and conduction band minimum (CBM) 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 (VB), band gap Δ1 and spin-flip gap Δ3 in conduction band (CB).Up to now, bipolar magnetic semiconductors, together with half-metal and spin gapless semiconductor, have been viewed as three important classes of spintronic materials.