Berlin 2008 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 40: Magnetism in Thin Films: Interaction Phenomena and Heterostructures
DS 40.2: Vortrag
Freitag, 29. Februar 2008, 12:45–13:00, H 2032
Epitaxial SmCo5/Fe/SmCo5 trilayers - a model system for exchange spring media — •Volker Neu, Katrin Häfner, and Ludwig Schultz — IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany
Exchange coupled hard / soft magnetic nanocomposites have recently found a renewed interest in data storage application as exchange spring media, also named exchange coupled composite (ECC). Developed formerly to improve the energy density of a hard magnetic material by an intimate, direct exchange coupling to a soft magnetic phase with high saturation polarization, as exchange spring media, the soft magnetic phase initiates the switching at moderate fields and thus enables the writability, whereas the high anisotropy of the hard phase guaranties the desired thermal stability in zero field [1]. Epitaxial SmCo5/Fe bilayers and SmCo5/Fe/SmCo5 trilayers with tunable switching behaviour [2] constitute a well defined model system for studying of the above mentioned coupling phenomena. We present time dependent magnetization relaxation data measured at different reversal fields, which allow to compare thermal stability and switching fields for single hard layers and bilayers and trilayers with varying thickness of the soft layer.
[1] Suess et al., Appl. Phys. Lett. 87, 012504 (2005). [2] Neu et al., J. Phys. D : Appl. Phys. 39 5116 (2006).