IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Magnetic Interfaces and Nanostructures Tuesday Sessions
       Session MI-TuP

Paper MI-TuP4
Magnetism and Transport in Manganite-based Trilayers A/B/A (A: La@sub 0.6@Sr@sub 0.4@MnO@sub 3@; B: La@sub 0.9@Sr@sub 0.1@MnO@sub 3@, La@sub 0.67@Ca@sub 0.33@MnO@sub 3@)

Tuesday, October 30, 2001, 5:30 pm, Room 134/135

Session: Emerging Materials & Nanostructures Poster Session
Presenter: L.B. Steren, Centro Atomico Bariloche and Instituto Balseiro, Argentina
Authors: L.B. Steren, Centro Atomico Bariloche and Instituto Balseiro, Argentina
M. Sirena, Centro Atomico Bariloche and Instituto Balseiro, Argentina
M. Granada, Centro Atomico Bariloche and Instituto Balseiro, Argentina
J. Guimpel, Centro Atomico Bariloche and Instituto Balseiro, Argentina
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We have studied the physical and structural properties of trilayers based on manganites compounds. Different ferromagnetic spacers, insulator (B1) and metallic (B2), have been used in order to compare the magnetotransport effect and interlayer coupling of both systems. Thin films and trilayers have been grown by dc sputtering. Films of La@sub 0.6@Sr@sub 0.4@MnO@sub 3@ ("A"}), La@sub 0.67@Ca@sub 0.33@MnO@sub 3@ ("B2") and La@sub 0.9@Sr@sub 0.1@MnO@sub 3@ (``B1"}) with thickness varying from 5nm to 50nm have been first prepared in order to study the intrinsic properties of these materials. "A" thin films are ferromagnetic with a Curie temperature around room temperature. These manganites present a metal-insulator transition below T@sub C@ and exhibit colossal magnetoresistance. A similar behaviour has been found in the "B2" films, with lower characteristic temperatures. "B1" are also ferromagnetic but present different transport properties : They are insulators between 4.2K and room temperature. All the compounds preserve its general properties, even for the smaller thicknesses. However, an important depression of the Curie point is observed as the films thickness is decreased. The trilayers have been prepared with different A and B thicknesses (10 nm