Berlin 2008 – scientific programme

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MA: Fachverband Magnetismus

MA 4: Magnetic Coupling Phenomena; Exchange Bias

MA 4.1: Talk

Monday, February 25, 2008, 10:15–10:30, H 1028

MOKE and BLS measurements of interlayer exchange coupling on epitaxial Fe/Cr/Fe wedge system — •Patrik Grychtol, Roman Adam, Matthias Buchmeier, and Claus Michael Schneider — Institute of Solid State Research, IFF-9 "Electronic Properties" , Research Center Juelich, D-52425 Juelich

Within the scope of a study on the magnetization dynamics of thin multilayer systems, a preliminary investigation of the interlayer exchange coupling in an epitaxially grown wedge shaped sample comprising two layers of iron (top 10nm, bottom 15nm) separated by a layer of chromium varying from 0.5nm to 5nm is carried out. Magneto-optic Kerr effect (MOKE) magnetometry as well as Brillouin light scattering (BLS) spectroscopy is employed in combination with an external field applied along the hard and easy axis of the magneto-crystalline anisotropy in order to extract the magnetic coupling parameters. While initially utilizing MOKE to characterize the interlayer coupling statically, BLS provides an additional tool to elaborate on the coupling behaviour, as the measured frequency of the optical magnons distinctly depends on the torque exerted by the coupling of the magnetization across the chromium layer. The results derived from both techniques are discussed and compared with model calculations.