Upper limit to magnetism in LaAlO_3/SrTiO_3 heterostructures
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2011
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American Physical Society
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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, I.K.: Upper Limit to Magnetism in LaAlO 3 / SrTiO 3 Heterostructures. Phys. Rev. Lett. 107, 217201 (2011). https://doi.org/10.1103/PhysRevLett.107.217201
Abstract
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.