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Preparation and magnetic properties of magnonic thin film structures
F. Lisiecki
Diploma thesis for M.Sci.: F. Lisiecki (thesis supervisor: Prof. Dr Feliks Stobiecki)

The main goal of this thesis was to fabricate one-dimensional magnonic crystals from Ni80Fe20 stripes using electron-beam lithography and lift-off technique, and measure their static and dynamic magnetic properties. The stripes form periodic and, by obeying the Fibonacci rule, quasiperiodic structures. To measure their dynamic magnetic properties, the structures were integrated with coplanar waveguides and fabricated using direct laser writing. For both fabrication techniques, optimization was performed. Static magnetic properties were studied with magneto optical Kerr effect and magnetic force microscope. These methods allowed measurements of the hysteresis loops and imaging the magnetization switching in the stripes. Magnetization dynamics was studied using ferromagnetic resonance with vector network analyzer. In the periodic structures one coercive field was found associated with the spectra typical of an array of periodic stripes. However, for quasiperiodic arrays two coercivity fields, related to switching of magnetization direction in the stripes of different width and additional excitation modes were observed.

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Size5.23 MB
Downloads213
Created2016-06-06
Created byFilip Lisiecki
Changed2016-06-06
Changed byJarosław Kłos

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