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AM: Magnetismus
AM 9: Poster: Magnetowid. (1-17), Dü. Schichten (18-34), Oberfl
ächenmag. (35,36), Mikr. Methoden (37-45), Mikromag. (46-58), Phasenüberg. (59-77), Spektroskop. (78-91), Nanokr.Mat.(92-96), Anisotrop. (97-101), Schmelzen(102-104),Sonst/postdeadl.(105-109)
AM 9.33: Poster
Dienstag, 27. März 2001, 14:45–19:00, Foyer S 3
Structural and Magnetic properties of La2/3(Ba,Ca)1/3MnO3 layered compunds. — •Gerardina Carbone1, Assunta Vigliante1, Rudolf Gross2, Juergen Klein2, and Lambert Alff2 — 1MPI-MF, Heisenbergstr.1, 70569, Stuttgart, Germany — 2Physicalisches Institut, Universitaet zu Koeln, Zuelpischerstr. 77, D50937 Koeln, Germany
We investigate the magnetic and structural properties of artificially layered thin films of La2/3(Ba,Ca)1/3MnO3 compounds epitaxially grown on SrTiO3 substrate by Pulsed Laser Ablation. The samples show a colossal magnetoresistence behaviour for small applied magnetic fields and in a wide range of temperatures. From SQUID measurements one can clearly observe two ferromagnetic transitions with different critical temperatures indicating the presence of a thin magnetic layer with a strongly suppressed Curie temperature. The transport properties of such samples can be attributed to a tunneling mechanism throught this thin barrier. X-ray diffraction (XRD) measurements indicate a good quality of the sample and a clear layering of the structure. Polarized Neutron Reflectivity (PNR) profiles have also been carried out to investigate the magnetic structure of the samples, and the result will be discussed.