  Searching ferromagnetic semiconductor materials with electrically
controllable spin polarization is a long-term challenge for spintronics.
Bipolar magnetic semiconductors (BMS), with valence and conduction band edges
fully spin-polarized in different spin directions, show great promise in this
aspect because the carrier's spin polarization direction can be easily tuned by
voltage gate. Here, we propose a standard high-throughput computational
screening scheme for searching BMS materials. The application of this scheme to
the Materials Project database gives 11 intrinsic BMS materials (1 experimental
and 10 theoretical) from nearly 40000 structures. Among them, a room
temperature BMS Li2V3TeO8 (mp-771246) is discovered with a Curie temperature of
478K. Moreover, the BMS feature can be maintained well when cutting the bulk
Li2V3TeO8 into (001) nanofilms for realistic applications. This work provides a
feasible solution for discovering novel intrinsic BMS materials from various
crystal structure databases, paving the way for realizing electric-field
controlled spintronic devices.
