Upper limit to magnetism in LaAlO3/SrTiO3 heterostructures

Details Upper limit to magnetism in LaAlO3/SrTiO3 heterostructures Upper limit to magnetism in LaAlO3/SrTiO3 heterostructures

2011-09-06

arxiv.org/abs/1109.1274v1

Physics

Condensed Matter

Materials Science

Scientific paper

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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