Dresden 2014 – wissenschaftliches Programm
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AGjDPG: Arbeitsgruppe junge DPG
AGjDPG 2: PhD Symposium: Magnon Plasmonics (jointly with MA)
AGjDPG 2.15: Poster
Dienstag, 1. April 2014, 15:01–15:45, HSZ 04
Magnetoplasmonics in Co and Ni nanoferromagnets — •Irina Zubritskaya1, Kristof Lodewijks2, Randy Dumas3, Addis Mekkonen4, Johan Åkerman5, and Alexandre Dmitriev6 — 1Department of Applied Physics, Chalmers University of Technology, Gothenburg, Sweden — 2Department of Applied Physics, Chalmers University of Technology, Gothenburg, Sweden — 3Department of Physics, University of Gothenburg, Gothenburg, Sweden — 4Department of Applied Physics, Chalmers University of Technology, Gothenburg, Sweden — 5Department of Physics, University of Gothenburg, Gothenburg, Sweden — 6Department of Applied Physics, Chalmers University of Technology, Gothenburg, Sweden
In our study, we compare magnetoplasmonic response in pure ferromagnetic nanostructures made of Co and Ni with magneto-optical response in respective continuous films of the same thickness. We show that localized surface plasmon resonances determine the magneto-optical response. Spectroscopic Kerr rotation values for all types of nanostructures and continuous films are obtained using longitudinal magneto-optical Kerr effect (L-moke) in P- and S- configurations of light polarization with respect to the magnetic field covering the region of wavelengths from 450 to 1100 nm. Both magnitude and sign of Kerr rotation angle depend on which plasmonic mode is excited and how the electric and the magnetic fields are oriented with respect to each other. We also demonstrate how the magnetic coupling between the particles in a dimer is affected by the gap size.