1,574 research outputs found
Magnetically asymmetric interfaces in a (LaMnO)/(SrMnO) superlattice due to structural asymmetries
Polarized neutron reflectivity measurements of a ferromagnetic
[(LaMnO)/(SrMnO)] superlattice reveal a modulated
magnetic structure with an enhanced magnetization at the interfaces where
LaMnO was deposited on SrMnO (LMO/SMO). However, the opposite
interfaces (SMO/LMO) are found to have a reduced ferromagnetic moment. The
magnetic asymmetry arises from the difference in lateral structural roughness
of the two interfaces observed via electron microscopy, with strong
ferromagnetism present at the interfaces that are atomically smooth over tens
of nanometers. This result demonstrates that atomic-scale roughness can
destabilize interfacial phases in complex oxide heterostructures.Comment: 5 pages, 4 figure
Suppressed magnetization in LaCaMnO/YBaCuO superlattices
We studied the magnetic properties of LaCaMnO /
YBaCuO superlattices. Magnetometry showed that with
increasing YBaCuO layer thickness the saturation
magnetization per LaCaMnO layer decreases. From polarized
neutron reflectometry we determined that this magnetization reduction is due to
an inhomogenous magnetization depth profile arising from the suppression of
magnetization near the LaCaMnO /
YBaCuO interface. Electron energy loss spectroscopy
indicates an increased 3d band occupation of the Mn atoms in the
LaCaMnO layers at the interface. Thus, the suppression of
ferromagnetic order at the LaCaMnO /
YBaCuO interface is most likely due to charge transfer
between the two materials.Comment: 4 pages, 4 figures, submitted to Phys. Rev.
Lithium peroxide test program Final report
Experimental design and performance data on carbon dioxide and oxygen control for portable life support system using lithium peroxid
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