Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 31: Surface Magnetism / Magnetic Imaging II
MA 31.15: Vortrag
Donnerstag, 25. März 2010, 19:00–19:15, H23
Measuring GMR of single phthalocyanine molecules — •Detlef Kramczynski1, Stefan Schmaus1,2, Annika Bork1, Yasmine Nahas1, Toyokazu Yamada1, and Wulf Wulfhekel1,2 — 1Physikalisches Institut, Karlsruher Institut für Technologie, Germany — 2Center for Functional Nanostructures, Karlsruher Institut für Technologie, Germany
The ongoing downsizing process in electronics and data storage has set the focus of the last years on studying the properties of nanoscale objects, like single molecules and single atoms.
We present the results of our measurements of the spin-dependent conductance of single hydrogen phthalocyanine molecules, obtained with low temperature scanning tunneling microscopy. The molecules were evaporated on different magnetic metal surfaces, that serve as one of the spin-polarized electrodes. The second electrode was a W-tip coated with magnetic material (Co, Fe). Direct contact was established by a controlled approach of the tip towards the surface, until a sidegroup of the molecule flipped up, touching the tip and bridging the tunneling gap. By changing the relative magnetization of tip or substrate, we were able to measure the GMR of a single molecule.