Recent progress in 2D bipolar magnetic semiconductors.

Bipolar magnetic semiconductor (BMS) is a class of magnetic semiconductors, whose valence band maximum and conduction band minimum are fully spin-polarized with opposite spin directions. Due to the special energy band, half-metallicity can be easily obtained in BMS by gate voltage, and the spin polarization can be reversed between spin-up and down when the gate voltage switches from positive to negative. BMSs have great potential applications in spintronic devices, such as the field-effect spin valves, spin filters and spin transistors, etc.. With the rapid progress of the two-dimensional (2D) magnetic materials, more and more 2D BMSs have been explored. In this paper, we review the research progress in 2D BMSs.&#xD.