Regensburg 2002 – wissenschaftliches Programm

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MA: Magnetismus

MA 10: Poster : Dünne Schichten(1-21),Spinabh.Transp.(22-39),Exch.Bias(40-51),Spindyn.(52-55),Mikromag.(56-66),Partikel(67-74),Abb.Verf.(75-77),Oberfl.+Spinelektr.+Elektr.Theo+Mikromag(75-87),PÜ+Aniso+Werkst/Leg.(88-103),Mol.Mag.+N-dim+Messm.+Postdead(104-111

MA 10.69: Poster

Dienstag, 12. März 2002, 15:00–19:00, Bereich A

Magnetization dynamics in percolating Co₈₀Fe₂₀/Al₂O₃ granular films — •O. Sichelschmidt¹, X. Chen¹, O. Petracic¹, Ch. Binek¹, W. Kleemann¹, J. B. Sousa², S. Cardoso³, and P. P. Freitas³ — ¹Laboratorium für Angewandte Physik, Gerhard-Mercator-Universität, D-47048 Duisburg — ²IFIMUP, Departamento de Fisica, Universidade de Porto, 4169-007 Porto, Portugal — ³INESC, Rua Alves Redol 9-1, 1000 Lisbon, Portugal

Discontinuous metal-insulator multilayers Co₈₀Fe₂₀(t)/ Al₂O₃(3nm)₁₀ were studied by SQUID magnetometry and magneto-optic Kerr effect. For small values of the nominal thickness, t ≤ 1.4 nm the CoFe forms isolated ferromagnetic particles in the Al₂O₃ matrix. For t > 1.4 nm percolation to ferromagnetic network sets in. We focused on magnetization reversal dynamics as found from sweep time dependent hysteresis curves for samples with 1.3 nm ≤ t ≤ 1.6 nm. The experimental results are compared with Monte Carlo simulations on realistic model systems.