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MA: Magnetismus

MA 12: Hauptvortr
äge Hütten / Bader

MA 12.1: Hauptvortrag

Dienstag, 9. März 2004, 14:00–14:30, H10

Progress in Designing Multilayered Thin Films for Magnetoelectronic Applications — •Andreas Hütten — Department of Physicis, P.O.Box 100131, D-33501 Bielefeld, Germany

Today’s successful design of multilayered thin films for magnetoelectronic applications requires the knowledge of (1) tuning their magnetic switching behavior in a given field range, (2) enhancing their temperature stability and (3) enhancing the spin polarization of the involved magnetic electrodes. The magnetic switching can be controlled by utilizing the appropriate magnetic interaction mechanisms known as the interlayer exchange coupling, the anti- and ferromagnetic biasing and the ferromagnetic strayfield coupling. The key to enhance the temperature stability is to make use of recrystallization processes so as to reduce the interfacial roughness and the microstructural paths of high atomic mobility. To enhance the spin polarization new magnetic electrodes such as half metallic oxides or Heusler alloys are currently evaluated world wide. The objective of this talk is to discuss exemplary the design aspects (1) and (2) relevant for spin-valves and multilayers interacting with hard magnetic FePt- and CoCrPt- thin films. The attention then will be focused on aspect (3) using the Co₂SiMn Heusler alloy to report on the experimentally realized spin polarization in magnetic tunnel junctions.