Berlin 2005 – scientific programme
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MA: Magnetismus
MA 18: Magnetische dünne Schichten III
MA 18.9: Talk
Monday, March 7, 2005, 12:30–12:45, TU H1028
Switching behaviour of small FePt grains observed by magnetic force microscopy — •Ulrike Wolff, Stefan Pofahl, Martin Weisheit, Sebastian Fähler, Ludwig Schultz, and Volker Neu — IFW Dresden, P.O. Box 270116, 01171 Dresden
FePt films of small grains with an average grain size of 100-500nm have been prepared by pulsed laser deposition onto MgO(001) substrates at high temperatures of 800∘C in order to form the L10 hard magnetic phase. The grains are isolated, fully out-of-plane oriented in c-axis, exhibit a coercivity of 3-5.6T, depending on the grain size, and show in the remanent state single domains [1]. The magnetization process is investigated by means of Magnetic Force Microscopy by measuring in an applied magnetic field of up to 7T (Cryogenic SFM, Omicron) or by imaging the magnetic domain structure of different remanent states with a Dimension 3100 (Digital Instruments). This local study allows the evaluation of grain size dependence on the switching behaviour of individual FePt grains.
[1] M. Weisheit, L. Schultz, S. Fähler, J. Appl. Phys. 95 (2004) 7489