Fitzsimmons, MichaelHengartner, NicolasSingh, SurendraZhernenkov, MikhailBruno, Flavio YairSantamaría Sánchez-Barriga, JacoboBrinkman, AlexanderHuijben, MarkMolegraaf, Hajode la Venta, JoseSchuller, Ivan K.2023-12-202023-12-202011Fitzsimmons, M.R., Hengartner, N.W., Singh, S., Zhernenkov, M., Bruno, F.Y., Santamaria, J., Brinkman, A., Huijben, M., Molegraaf, H.J.A., De La Venta, J., Schuller, I.K.: Upper Limit to Magnetism in LaAlO 3 / SrTiO 3 Heterostructures. Phys. Rev. Lett. 107, 217201 (2011). https://doi.org/10.1103/PhysRevLett.107.2172010031-900710.1103/PhysRevLett.107.217201https://hdl.handle.net/20.500.14352/91632Using 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.engjournal article1079-7114https://doi.org/10.1103/PhysRevLett.107.217201https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.107.217201restricted access538.9Neutron scatteringInterfacesSuperconductivityCoexistenceFísica del estado sólido2211 Física del Estado Sólido