  We present our calculation results for organic magnetic electrides. In order
to identify the `cavity' electrons, we use maximally-localized Wannier
functions and `empty atom' technique. The estimation of magnetic coupling is
then performed based on magnetic force linear response theory. Both short- and
long-range magnetic interactions are calculated with a single self-consistent
calculation of a primitive cell. With this scheme we investigate four different
organic electrides whose magnetic properties have been partly unknown or under
debate. Our calculation results unveil the nature of magnetic moment and their
interactions, and justify or defy the validity of preassumed spin models. Our
work not only provides useful insight to understand magnetic electrides but
also suggests a new paradigm to study the related materials.
