  The present work reports experimental evidence of random magnetic behavior
observed in modified barium hexagonal ferrites. A significant transition in the
magnetic properties of this system is observed when divalent cations (Ni2+,
Cu2+, Mn2+) are introduced in the structure and give rise to a magnetic
nanocomposite. Such introduction takes place in a random manner throughout each
sample and creates the conditions for such materials to behave as random
magnets. We verify the occurrence of such behavior in our samples by fitting
the magnetization in approaching saturation to the corresponding theoretical
model. We therefore analyze the microwave absorption capacities of random
magnets in the GHz range and predict large and broad absorption signals under
certain conditions. The findings presented here postulate, for the first time,
ceramic materials as promising random magnets and underline their potential as
microwave absorbers, in good agreement with recent theoretical models.
