  The interplay of symmetry and quenched disorder leads to some of the most
fundamentally interesting and technologically important properties of
correlated materials. It also poses the most vexing of theoretical challenges.
Nowhere is this more apparent than in the study of spin glasses. A spin glass
is characterized by an ergodic landscape of states - an innumerable number of
possibilities that are only weakly distinguished energetically, if at all. We
show in the material Fe$_x$NbS$_2$, this landscape of states can be biased by
coexisitng antiferromagnetic order. This process leads to a phenomenon of broad
technological importance: giant, tunable exchange bias. We observe exchange
biases that exceed those of conventional materials by more than two orders of
magnitude. This work illustrates a novel route to giant exchange bias by
leveraging the interplay of frustration and disorder in exotic materials.
