Using polarized neutron reflectometry (PNR) we measured the neutron spin dependent reflectivity from four LaAlO 3 /SrTiO 3 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/cm 3. 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 LaAlO 3 and SrTiO 3 .
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