Regensburg 1998 – wissenschaftliches Programm

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AM: Magnetismus

AM 2: Magnetowiderstand und Magnetoimpedanz dünner Schichten

AM 2.4: Vortrag

Montag, 23. März 1998, 11:15–11:30, H23

Grain boundary magnetoresistance in La_(1−x)(Sr,Ca)_xMnO_(3−δ) thin films sputtered on single crystalline substrates — •K. Steenbeck, T. Eick, K. Kirsch, R. Mattheis, H.G. Schmidt, and E. Steinbei"s — Institut f"ur Physikalische Hochtechnologie IPHT Jena, Postfach 100,D-07702 Jena

The Colossal magnetoresistance (CMR) of doped La-manganite thin films near their Curie temperature is an intrinsic property of the magnetic material and can be separated from the grain boundary magnetoresistance (GBMR) which increases with decreasing temperature. The GBMR is of special interest because its high field sensitivity at H of order the coercive field. We have measured the magnetoresistance of sputtered films on single crystal and bicrystal substrates at different temperatures and magnetic fields. The GBMR depends on deposition conditions, grain boundary quality and angle, and the results are discussed in the frame of different models.