%0 Journal Article
%A Fitzsimmons, Michael
%A Hengartner, Nicolas
%A Singh, Surendra
%A Zhernenkov, Mikhail
%A Bruno, Flavio Yair
%A Santamaría Sánchez-Barriga, Jacobo
%A Brinkman, Alexander
%A Huijben, Mark
%A Molegraaf, Hajo
%A de la Venta, Jose
%A Schuller, Ivan K.
%T Upper limit to magnetism in LaAlO_3/SrTiO_3 heterostructures
%D 2011
%@ 0031-9007
%U https://hdl.handle.net/20.500.14352/91632
%X 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.
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