Precipitate-free films of La1-xSrxMnO3 grown on the substrates with artificial step edges

Ishii, Y.; Sato, H.; Sawa, A.; Yamada, T.; Akoh, H.; Endo, K.; Kawasaki, M.; Tokura, Y.
October 2004
Applied Physics Letters;10/25/2004, Vol. 85 Issue 17, p3800
Academic Journal
We have fabricated precipitate-free La0.7Sr0.3MnO3 (LSMO) films by locating precipitate nucleation at artificial step edges patterned on SrTiO3 substrates and absorbing excess species of off-stoichiometry by getter effect. The precipitate-free and atomically flat area of about 10 μm width can be obtained along the step edges by pulsed-laser deposition at a substrate temperature Ts of ∼900 °C. Thermally activated processes are shown to be involved in such chemical reactions between the precipitates and surface migrating species. LSMO/SrTiO3/LSMO tunnel junctions fabricated by this method showed an excellent uniformity of the junction resistances.


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