Regensburg 2004 – wissenschaftliches Programm

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MA: Magnetismus

MA 13: Poster:Schichten(1-23),Spinabh.Trsp(24-41),Exch.Bias(42-56),Spindyn.(57-67),Mikromag.(68-76),Partikel(77-90),Spinelektr.(91-97),Elektr.Theo.(98-99),Mikromag+PhasÜ+Aniso.(100-105),Magn.Mat.(106-118),Messmethod.(119-121),Obflm.+Abbverf.(122-123)

MA 13.44: Poster

Dienstag, 9. März 2004, 15:00–19:00, Bereich A

CEMS and NRS investigation of the spin structure in exchange biased Fe/FeF₂ bilayers — •B. Sahoo¹, W. A. A. Macedo^2,3, J. Eisenmenger^2,4, W. Keune¹, R. Röhlsberger⁵, T. Klein⁶, J. Nogues⁷, V. Kuncser^1,8, I. K. Schuller², K. Liu⁹, I. Felner¹⁰, O. Leupold¹¹, and R. Rüffer¹¹ — ¹Universität Duisburg-Essen, Duisburg, Germany — ²University of California, San Diego, USA — ³CDTN, Belo Horizonte, Brazil — ⁴Universität Ulm, Ulm, Germany — ⁵HASYLAB at DESY, Hamburg, Germany — ⁶Universität Rostock, Rostock, Germany — ⁷ICREA and Universitat Autonoma de Barcelona, Bellaterra, Spain — ⁸NIPM, Bucharest, Romania — ⁹University of California, Davis, USA — ¹⁰Hebrew University, Jerusalem, Israel — ¹¹ESRF, Grenoble, France

By cooling down the exchange biased Fe/FeF₂ bilayer system below the Néel temperature (T_N) of the AFM, a change of the spin structure in the FM layer is observed by CEMS. The ferromagnetic spins are always in the sample plane, and an average in-plane rotation of the spins equivalent to a spin fanning is observed. This spin fanning is reduced farther away from the interface. The NRS results are consistent with CEMS observations. A small out-of-plane spin component at the interface of the AFM layer is also observed. The interfacial spin structure of the AFM layer is modeled by an ellipsoidal spin distribution.
Acknowledgement: Supported by DFG (SFB 491)