"Scientists at Radboud University discovered a new mechanism for magnetic storage of information in the smallest unit of matter: a single atom."

This press release is aimed at a fairly technically oriented audience, so I'm going to being very precise about why the leading statement in the press release is wrong.

The electron is smaller, more fundamental, more fundamental as a unit, and more fundamental at a higher level of science (is in, electrons are even more fundamental to chemistry than atoms are to physics), than the atom.