Dresden 2006 – wissenschaftliches Programm

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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.52: Poster

Dienstag, 28. März 2006, 15:15–19:15, P1

Magnetic switching behavior of LSMO-Alq₃-Co layered structures — •J. Schumann, D. Elefant, H. Vinzelberg, J. Thomas, K. Dörr, R. G. Gangineni, and B. Büchner — IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany

Giant magnetoresistance effects found in La_0.7Sr_0.3MnO₃-Alq₃-Co layer stacks [1] show the Alq₃-Co interface to be the crucial preparation problem. We produced a diversity of such layered structures on SrTiO₃ substrates, systematically changing the preparation methods and parameters and subsequently monitoring the switching behavior of the magnetic components of the different layer stacks via alternating gradient magnetometry and SQUID magnetometry down to T=1.8K. As supplementary electrodes NiFe and CoFe were tested. Including TEM cross section investigations, an optimized preparation procedure for the layer stacks was searched to realize defined magnetic switching ( especially without any exchange biasing ) - the prerequisite for magnetoresistance measurements.

[1] Z. H. Xiong, Di Wu, Z. Valy Vardeny, and Jing Shi, Nature 427, 821(2004)