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MA: Fachverband Magnetismus

MA 14: Spin Dynamics / Spin Torque I

MA 14.4: Vortrag

Mittwoch, 24. März 2010, 10:30–10:45, H10

Element resolved magnetisation dynamics in Fe_1−xNi_x thin films — •Stefan Buschhorn, Frank Brüssing, Benjamin Glaubitz, Radu Abrudan, and Hartmut Zabel — Experimentalphysik IV, Ruhr-Universität Bochum

X-Ray Resonant Magnetic Scattering (XRMS) in combination with pump-probe techniques is a unique tool in order to directly observe element-resolved magnetisation dynamics. We present a time resolved setup with a time resolution of less than 100ps, using a magnetic field pulse excitation. The sample is mounted on a stripline and the reflected signal is averaged over many excitations in a delay scan with respect to the synchrotron flash. The experiments were done using the ALICE diffractometer [1]. We present results on the precessional dynamics of a Py sample in a temperature range from 80…350K, showing that both Fe and Ni precess in phase within the given resolution (see also [2]). There is no discernable change in temperature over the temperature range studied. In addition, we followed the frequency dependence of the precession as a function of alloy composition for a set of Fe_1−xNi_x thin films in order to reveal possible variations around the invar region.
This work was supported by BMBF under contracts 05KS7PC1 and 05ES3xBA/5. St. Buschhorn is fellow of the Ruhr-University Research School.

[1] J. Grabis, et.al., Rev. Sci. Inst. 74, 4048 (2003)

[2] W. Bailey, et.al., Phys. Rev. B 70, 172403 (2004)