Local field effects in magneto-optics of two-dimensional arrays of ferromagnetic nanoparticles |
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Authors: | V A Kosobukin and B B Krichevtsov |
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Institution: | (1) Electronic Materials Research Laboratory, Key laboratory of the Ministry of Education, Xi’an Jiaotong University, Xi’an, 710049, China; |
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Abstract: | A theory of the polar magneto-optical Kerr effect in a layer of small ferromagnetic particles has been developed in the framework
of the Green’s function method of electrodynamics. The manifestation in magneto-optics of the local field effect, which is
initiated by the contribution to the effective field of dipole moments induced in particles, has been studied in terms of
the model of a square lattice of ferromagnetic ellipsoids. The magneto-optical Kerr effect stimulated under normal incidence
of a linearly polarized electromagnetic wave on a layer of particles magnetized perpendicular to the layer plane has been
analyzed. The dependence of the Kerr rotation angle in an array of ellipsoidal Co particles embedded in the transparent dielectric
CaF2 on the light frequency, the parameters of the ellipsoidal particles, and the lattice period (concentration of the magnet
in the layer) has been studied numerically. It has been shown that, within a broad (2.0–4.5 eV) spectral range, the local
field effect studied as a function of increasing concentration of Co particles in the layer manifests itself in the reversal
of the sign of the Kerr rotation compared to that observed in a single ellipsoid or a solid Co film. |
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Keywords: | |
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