Magnetodielectric materials, which have a dielectric constant
that is modulated by an applied magnetic field, provide rich
insight into the physics of spin-charge coupling. The coupling
between the dielectric constant and magnetic field—the
magnetodieletric coupling—is often mediated by lattice dynamics
, typically leading to only very small shifts in the dielectric
constant. Some special classes of materials do exhibit
exceptionally large shifts—a relative change in the dielectric
constant of in high magnetic fields —but these effects are
generally present only in a very narrow range of temperatures
near a phase transition and are not suitable for robust device
applications. Materials having a substantial magnetodielectric
coupling at high temperatures are expected to lead to the
development of novel devices, including capacitive magnetic
field sensors and tunable high-frequency filters [3, 4]. One of
the outstanding challenges in the study of magnetodiectrics is
to identify mechanisms that can lead to stron