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.
@article{arxiv.1109.1274,
title = {Upper limit to magnetism in LaAlO3/SrTiO3 heterostructures},
author = {M. R. Fitzsimmons and N. Hengartner and S. Singh and M. Zhernenkov and F. Y. Bruno and J. Santamaria and A. Brinkman and M. Huijben and H. Molegraaf and J. de la Venta and Ivan K. Schuller},
journal= {arXiv preprint arXiv:1109.1274},
year = {2015}
}