  Using polarized neutron reflectometry (PNR) we measured the neutron spin
dependent reflectivity from four LaAlO3/SrTiO3 superlattices. This experiment
implies that the upper limit for the magnetization induced by an 11 T magnetic
field at 1.7 K is 2 emu/cm3. SQUID magnetometry of the superlattices
sporadically finds an enhanced moment, possibly due to experimental artifacts.
These observations set important restrictions on theories which imply a
strongly enhanced magnetism at the interface between LaAlO3 and SrTiO3.
