Dresden 2006 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
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 20.159: Poster
Tuesday, March 28, 2006, 15:15–19:15, P1
A New Approach to Grafting Isolated Mn12 Single Molecule Magnets on the Au surface — •Sönke Voss1, Michael Burgert2, Mikhail Fonin1, Ulrich Groth2, and Ulrich Rüdiger1 — 1Fachbereich Physik, Universität Konstanz, D-78457 Konstanz — 2Fachbereich Chemie, Universität Konstanz, D-78457 Konstanz
During the last decade single-molecule magnets (SMMs) have attracted much attention due to their unique properties, such as quantum tunneling of magnetization, making these compounds attractive for applications in quantum computing [1]. Among them Mn12-acetate [2] and its derivatives which possess high blocking temperatures and exhibit stepwise ferromagnetic hysteresis. Aside with the investigation of magnetic properties of SMMs in their bulk crystalline form considerable research has been recently focused on SMMs attached to metallic surfaces in attempt to address the electronic and magnetic properties of self-assembled layers as well as of isolated SMM molecules.
In this study Mn12 complexes with benzoic, propynoic, and phenylpropynoic acid ligands were prepared in order to modify the electronic properties of the complex and possibly affect the magnetic behavior in bulk as well as in thin films. SMM single crystals have been studied by SQUID showing stepwise hysteresis at low temperature. In addition Mn12 complexes were grafted onto the functionalized Au(111) surface and investigated by means of scanning tunneling microscopy as well as x-ray photoelectron spectroscopy at room temperature.
[1] M.N.Leuenberger and D.Loss, Nature (London) 410, 789 (2001).
[2] R.Sessoli et al., Nature (London) 365, 141 (1993).