Upper limit to magnetism in LaAlO3/SrTiO3 heterostructures

M.R. Fitzsimmons, N.W. Hengartner, S. Singh, M. Zhernenkov, F.Y. Bruno, J. Santamaria, Alexander Brinkman, Mark Huijben, Hajo Molegraaf, J. de la Venta, Ivan K. Schuller

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Using polarized neutron reflectometry we measured the neutron spin-dependent reflectivity from four LaAlO3/SrTiO3 superlattices. Our results imply that the upper limit for the magnetization averaged over the lateral dimensions of the sample induced by an 11 T magnetic field at 1.7 K is less than 2 G. SQUID magnetometry of the neutron superlattice samples 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.
Original languageUndefined
Pages (from-to)217201-
JournalPhysical review letters
Issue number21
Publication statusPublished - 2011


  • IR-104505
  • METIS-279867

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