  Frustrated lattices1-3, characterized by minor breakdown in local order in an
otherwise periodic lattice, lead to simultaneous possibilities of several
ground states which can trigger unique physical properties, in condensed matter
systems. In magnetic materials with atomic spins, frustration takes another
shape with added possibilities to construct various topological arrangements of
spins, whereby magnetic order is disturbed2,4. We have achieved a new approach
to introduce positional atomic disorder inside a Fe nanoparticle lattice,
forming domains without boundaries to study magnetic dynamics of the
constituent spins. This magnetism overrides the exchange bias derived magnetic
enhancement, appears only at temperatures around 200 K and is characterized by
a dynamic polarity, p = +/-1 (positive or negative) with a precise frequency.
The material otherwise behaves like a superparamagnet with characteristic
magnetization behaviour at room temperature and 2 K.
