Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)
MA 15.11: Poster
Dienstag, 27. März 2007, 15:00–19:00, Poster A
Magneto-optical Kerr Effect Spectroscopy of Magnetic Nanoclusters in Organic Thin Films — •Wen Li1, Roxana Pacurariu2, Dietrich Zahn1, and Georgeta Salvan1 — 1Chemnitz University of Technology, D-09107 Chemnitz, Germany — 2Babes-Bolyai University, RO-400085 Cluj-Napoca, Romania
The magnetic properties exhibited by magnetic nanoparticles are of great importance in view of their applications such as e.g. biosensors or high-density recording media. The surrounding medium can have a significant influence on the magnetic properties. One of the methods used to fabricate thin films of magnetic nanoparticles in organic molecular matrices with a good control on the particle size is the co-evaporation of the metal and the organic molecules in vacuum. In this work Ni nanoparticles with an average size of about 5 nm are produced in matrices of fullerene and rubrene. The molecule of fullerene consists of C atoms and has an icosahedral symmetry, while the rubrene molecule contains also H atoms and has a lower symmetry. The magnetic properties of the hybrid films are studied by magneto-optical Kerr-effect (MOKE) spectroscopy in a spectral range from near infrared (1.5 eV) to near ultraviolet (5.5 eV).
Magneto-optical Kerr effect resides in the change in the polarisation state of the light upon reflection on a magnetized sample and is often exploited to record magnetic hysteresis loops of thin metallic films. In addition, MOKE spectroscopy is capable of providing an insight in the electronic properties of the nanoparticles and thus in the structure and size of the metallic clusters.