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 20.159: Poster

Dienstag, 28. März 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).