In this work it is established that for regularities of the magneto-optical response from curved magnetic nanosructures, a crossover occurs at certain scales. At scales less than characteristic length the normalized value of magneto-optical hysteresis loop for transverse magneto-optical Kerr effect does not depend on incident angle of electromagnetic radiation. For curved nanostructures at scales of the order or large than characteristic length and at certain incident angles, hysteresis loops were observed that are inherent in magnetic vortex structures. For systems based on nanometers thick cobalt films deposited on various nanostructured substrates the characteristic length is of about of 100 nm. On the basis of the experimental data the energy consumption for the formation of vortex structures is estimated.
In this paper we present magnetooptical studies of nanostructures, including three-dimensional ones, formed by deposition metal layers on the surface of structured silicon. These objects demonstrate different magnetooptical behavior. Computer simulations demonstrated vortex domain structures appearance on the ellipsoidal surface of nanoobjects. Vortex domains with common center and multi-vortex states were observed.
In this work the superposition of effects with different diffraction origins and orders by formation of resulting magnetooptical response from the structures like magneto-photonic crystals in the regions far from plasmonic resonances were investigated for the first time. The contributions into magneto-optical response from diffraction and interferential phenomena in maxima of different orders in three-dimensional systems like magneto-photonic crystals were studied. It was demonstrated that the usage of integral response in order to analyze magneto-optical effects results in disappearance of interference phenomena. Diffraction maximum of the zero order reflects represent magnetic component of magnetooptical response. Numerical evaluations of observed effects were done.
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