  Various fundamental-physics experiments such as measurement of the
birefringence of the vacuum, searches for ultralight dark matter (e.g.,
axions), and precision spectroscopy of complex systems (including exotic atoms
containing antimatter constituents) are enabled by high-field magnets. We give
an overview of current and future experiments and discuss the state-of-the-art
DC- and pulsed-magnet technologies and prospects for future developments.
