"Surprising effects in the microwave response of magnetic nanoparticle structures"

Who: Bob Camley, University of Colorado at Colorado Springs, USA

Place: nanoGUNE seminar room, Tolosa Hiribidea 76, Donostia - San Sebastian

Date: Monday, 16 March 2015, 10:00

Host: Paolo Vavassori

Metallic ferromagnets are of interest for microwave signal processing because their large magnetization results in a strong interaction between the electromagnetic wave and the magnetic material. However, eddy current losses limit the usefulness of these materials. In thin films of nanoparticles and in nanostructures (such as gratings) one may eliminate eddy current effects while retaining the magnetic properties. The tunability of both the permitivity and permeability leads to surprising results, with large changes in the microwave response even for thin films. We explore this behavior, with particular attention to nonreciprocal reflections, where interchanging the incident and reflected waves produced a huge change in the size of the reflection.

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