  Electrides are a unique class of electron-rich materials where excess
electrons are localized in interstitial lattice sites as anions, leading to a
range of unique properties and applications. While hundreds of electrides have
been discovered in recent years, magnetic electrides have received limited
attention, with few investigations into their fundamental physics and practical
applications. In this work, 51 magnetic electrides (12 antiferromagnetic, 13
ferromagnetic, and 26 interstitial-magnetic) were identified using
high-throughput computational screening methods and the latest Material Project
database. Based on their compositions, these magnetic electrides can be
classified as magnetic semiconductors, metals, or half-metals, each with unique
topological states and excellent catalytic performance for N2 fixation due to
their low work functions and excess electrons. The novel properties of magnetic
electrides suggest potential applications in spintronics, topological
electronics, electron emission, and as high-performance catalysts. This work
marks the beginning of a new era in the identification, investigation, and
practical applications of magnetic electrides.
