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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 13.61: Poster

Tuesday, March 9, 2004, 15:00–19:00, Bereich A

Inductive time-domain measurement of magnetization dynamics in epitaxial Fe_1−xCo_x-films — •Tobias Martin, B. Becker, S. Ganzer, T. Hagler, W. Kipferl, M. Sperl, and G. Bayreuther — Institut für Experimentelle und Angewandte Physik, Universität Regensburg, 93040 Regensburg

For the development of faster memory-technologies, it is important to study the magnetization dynamics in thin magnetic films.

Here, the precessional motion of the magnetization is excited by a fast magnetic field step or pulse with a risetime of about 70ps, which is produced by a current guided through a coplanar waveguide. The precession of the magnetization induces a signal in the same or in a second waveguide, which is detected by a digital sampling oscilloscope with a bandwidth of 20 Ghz.

This setup is used to investigate the magnetization precession in epitaxially grown Fe_1−xCo_x-films. The film and the waveguide are brought into close proximity thus allowing for simple changing of samples and pulse-field angle. The magnetization dynamics, i.e. precessional frequency and damping coefficient, are determined for different values of the uniaxial and fourfold magnetic anisotropies, which can be controlled by the thickness and composition of the films, as well as the substrate (GaAs(001) and Au(001)).

This work is supported by the Deutsche Forschungsgemeinschaft (SPP1133).