Berlin 2012 – scientific programme
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MA: Fachverband Magnetismus
MA 51: Spin Excitations/ Spin Torque
MA 51.3: Talk
Friday, March 30, 2012, 10:00–10:15, H 1012
Extrinsically controlled spin relaxation in NiFe thin films induced by a periodic scattering potential — •Michael Körner1, Kilian Lenz1, Anja Banholzer1, Jochen Grebing1, Igor Barsukov2, Florian M. Römer2, Jürgen Lindner2, Michael Farle2, and Jürgen Fassbender1 — 1Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), P.O. Box 510119, 01314 Dresden, Germany — 2Fakultät für Physik and Center for Nanointegration Duisburg-Essen (CeNIDE), Universität Duisburg-Essen, D-47048 Duisburg, Germany
The spin relaxation process of thin Ni80Fe20 (Py) films is influenced by introducing a periodic scattering potential using ion beam techniques. These potentials can be created in two ways: (i) by Cr+ implantation into the surface of the Py film, using a lithographically defined mask. (ii) by using nanometer scale periodically modulated substrates (ripple) that change the morphology of the Py film grown on top [2]. The magnetic damping contributions are determined by frequency-dependent ferromagnetic resonance measurements using a vector network analyzer. For both sample systems we find several strongly enhanced linewidth peaks over a wide frequency range. By varying the scattering potential, the frequency positions of the damping peaks are preselectable.
This work is supported by DFG grant FA 314/6-1 and SFB 491.
[1] I. Barsukov et al., Phys. Rev. B 84, 140410(R) (2011).
[2] J. Fassbender et al., New Journal of Physics 11, 125002 (2009).