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MA: Magnetismus
MA 28: Spindynamik / Ummagnetisierungsvorg
änge
MA 28.13: Vortrag
Donnerstag, 11. März 2004, 18:15–18:30, H23
Comparison of Network Analyzer Ferromagnetic Resonance (NA-FMR) with pulsed inductive Measurements — •Ingo Neudecker1, Georg Woltersdorfer2, Matthias Buess1, Christian Back1, and Bret Heinrich2 — 1Fakultaet fuer experimentelle und angewandte Physik, Universitaet Regensburg, Universitaetstrasse 31, 93044 Regensburg — 2Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A-1S6, Canada
We placed a 20 ML thick Fe film on top of a lithographically fabricated coplanar waveguide. In a 20 GHz high frequency setup the ferromagnetic system was excited first with a continuous sinusoidal excitation using a Vector Network Analyzer and second without changing the setup with a field pulse (pulse generator with 70 ps rise time) using a 20 GHz sampling Oscilloscope to detect the signal.
By means of the resonance line one obtains from the NA-FMR both the resonance frequency from its position and the damping constant from its width. From the pulsed inductive measurement one extracts the resonance frequency using Fourier transformation and the damping constant from the decay of the observed oscillations.
Varying the magnetic bias field one can consequently derive the resonance behavior for the two methods.
Our purpose was to compare the fairly new NA-FMR method with its excellent signal to noise ratio which yields data in the frequency domain with the pulsed inductive measurement providing a time domain access to the resonance properties of the system.