Electromagnetic properties of ferromagnetic micro and nanowires for magnonics

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Excitations in periodic magnetic nanostructures can be used for information transport and processing. This new and rapidly emerging research field is called magnonics. My research program aims to design, develop and characterize such artificially nanostructured magnetic materials, to tailor their electromagnetic properties. This proposal is mainly concerned with arrays of ferromagnetic nanowires electroplated in nanoporous alumina membranes. The focus is on the microwave range of the spectrum. By combining metallic and ferromagnetic nanoinclusions in a dielectric template, we can exploit various charge and spin transport phenomena, along with spin and charge density waves, to achieve magnetic and dielectric responses not found in nature. This could lead to the development of new devices able to transport and process information at the nanoscale. The funds requested are essentially for the financial support of 2 PhD students. The specific objectives are: (1) to understand the dissipation mechanisms limiting practical applications in such materials; (2) to determine the nature of collective magnetic modes excited in FMNW arrays; (3) to investigate the effect of the intra-wire excitations on the collective excitations of the arrays; (4) to investigate whether the parametric amplification of spinwaves could actively compensate the losses of specific modes. Outcomes of the work include new tailorable microwave materials and new design possibilities for microwave circuits (wireless technologies).