  The rare-earth compounds R2O2Bi (R=Tb, Dy, Er, Lu, Y) are newly discovered
superconductors in the vicinity of a rare-earth magnetic long-range order. In
this work, we determine the magnetic order of the parent compound Dy2O2Te by
neutron scattering as the A-type antiferromagnetic structure below the N\'eel
temperature TN=9.7K. The large staggered magnetic moment 9.4(1) {\mu}B per Dy
at T=3.5K lies in the basal ab plane. In a magnetic field, anomalous magnetic
properties including the bifurcation between zero-field- and field-cooling
magnetization, a butterfly-shaped magnetic hysteresis, and slow magnetic
relaxation emerge, which are related to the field-induced metamagnetic
transitions in Dy2O2Te. Our experimental findings could stimulate further
research on the relation between antiferromagnetism and superconductivity in
these rare-earth compounds.
