Upper limit to magnetism in LaAlO3/SrTiO3 heterostructures

(1; (1) F. Y. Bruno; (1) N. Hengartner; (1) S. Singh; 2) M. Zhernenkov; (3) A. Brinkman; (3) J. Santamaria; (4) H. Molegraaf; (4) J. de la Venta; (4) M. Huijben

arxiv: 1109.1274 · v1 · pith:PUJUUT5Wnew · submitted 2011-09-06 · ❄️ cond-mat.mtrl-sci

Upper limit to magnetism in LaAlO3/SrTiO3 heterostructures

M. R. Fitzsimmons , (1) N. Hengartner , (1) S. Singh , (1 , 2) M. Zhernenkov , (1) F. Y. Bruno , (3) J. Santamaria , (3) A. Brinkman

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(4) M. Huijben (4) H. Molegraaf (4) J. de la Venta (5) Ivan K. Schuller (5) ((1) Los Alamos National Laboratory Los Alamos NM USA (2) Solid State Physics Division Bhabha Atomic Research Center Mumbai India (3) GFMC. Dpto. Fisica Aplicada III Universidad Complutense de Madrid Madrid Spain (4) MESA+ Institute for Nanotechnology University of Twente Enschede The Netherlands (5) Department of Physics Center for Advanced Nanoscience University of California San Diego La Jolla CA USA)

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classification ❄️ cond-mat.mtrl-sci

keywords laalo3srtio3enhancedlimitmagnetismneutronsuperlatticesupper

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Using polarized neutron reflectometry (PNR) we measured the neutron spin dependent reflectivity from four LaAlO3/SrTiO3 superlattices. This experiment implies that the upper limit for the magnetization induced by an 11 T magnetic field at 1.7 K is 2 emu/cm3. SQUID magnetometry of the superlattices 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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Upper limit to magnetism in LaAlO3/SrTiO3 heterostructures

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