Upper limit to magnetism in LaAlO3/SrTiO3 heterostructures

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

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Bibliographic Details
Published in:Physical review letters 2011-11, Vol.107 (21), p.217201-217201
Main Authors: Fitzsimmons, 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, Ivan K
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Language:English
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Summary:Using polarized neutron reflectometry we measured the neutron spin-dependent reflectivity from four LaAlO(3)/SrTiO(3) 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 LaAlO(3) and SrTiO(3).
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.107.217201