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 20.98: Poster
Dienstag, 28. März 2006, 15:15–19:15, P1
Magnetic Nanoclusters in Organic Thin Films — •D. Rosu1, R. Pacurariu2, B. Bräuer1, D.R.T. Zahn1, and G. Salvan1 — 1Chemnitz University of Technology, D-09107 Chemnitz, Germany — 2Babes-Bolyai University, RO-400085 Cluj-Napoca, Romania
The magnetic properties exhibited by small magnetic clusters, in particular their large magnetic moments, are of fundamental importance for the design of high-density recording memories [1]. The surrounding medium can have a significant influence on the magnetic properties. In this work transition elements such as Ni and Co and organic molecules are co-evaporated in ultra high vacuum to obtain thin hybrid films. One of the molecules used, fullerene, consists of solely C atoms and has an icosahedral symmetry. The other molecule, pentacene, contains additionally H atoms and has a planar structure. The mixed films contain metallic clusters the size of which is controlled by the evaporation rates. Raman spectroscopy is employed to study aspects such as chemical bond formation or charge transfer at the metal-organic interface and transmission electron microscopy is used to probe the cluster size and structure. The magnetic properties of the hybrid films are assessed by magneto-optical Kerr effect spectroscopy. It was found for example that Ni clusters in fullerene matrix are ferromagnetic at room temperature when the cluster diameter exceeds an average value of 5 nm. [1] J.L. Rodriguez-Lopez, F. Aguilera-Granja, A. Vega, J.A. Alonso, Solid State Communications 116 (2000) 309.