Magnetooptical Properties of Layer-by-Layer Deposited Ferromagnet—Dielectric Nanocomposites

Abstract

<p align="justify"> <span><span style="font-family:Verdana;">The </span><span><span style="font-family:Verdana;">present work was initiated to investigate how technology of preparation of nanocomposites (Co</span>_{<span style="font-family:Verdana;">45</span>}<span style="font-family:Verdana;">Fe</span>_{<span style="font-family:Verdana;">45</span>}<span style="font-family:Verdana;">Zr</span>_{<span style="font-family:Verdana;">10</span>}<span style="font-family:Verdana;">)</span></span></span><span> </span><span><span style="font-family:Verdana;">Z(Al</span>_{<span style="font-family:Verdana;">2</span>}<span style="font-family:Verdana;">O</span>_{<span style="font-family:Verdana;">3</span>}<span style="font-family:Verdana;">)</span>_{<span style="font-family:Verdana;">1-Z</span>}<span style="font-family:Verdana;"> affects their magneto-optical (MO) properties. The spectral, magnetic field and concentration dependences of the transversal Kerr effect (TKE)</span></span><span><span style="font-family:Verdana;"> have been studied either for bulk or layer-by-layer deposited nanocomposites within a wide range of the ferromagnetic (FM) phase concentrations and for various thicknesses of layers. It was found that the MO response of the layer-by-layer deposited nanocomposites with compositions inside the percolation interval differs essentially from the one of the bulk composites and depends on the layer thicknesses. With decreasing thicknesses of layers the percolation </span><span style="font-family:verdana;">threshold has been shifted towards the lower contents of the FM phase. In addition, it has been established that the size and shape of the granules inside the nanocomposite layer also depends on the layer thickness as well as the microstructure of the layer-by-layer sputtered composites considerably differs from the microstructure of the bulk nanocomposite.</span></span> </p

Magneto-Optical Properties of Multilayer Nanostructures with Composite Magnetic Layers near Percolation Threshold

“…For the first group of samples there is a sign reversal of the effect in the IR region and a maximum of TKE in the visible wavelength range. Such spectra are typical for bulk nanocomposite FM in dielectric matrix [4,6]. For the samples with small thickness of silicon (<1,30 nm) observed TKE growth with increasing thickness of Si.…”

“…Measurements of the TKE field dependences δ(Н) in the near IR and visible ranges has shown their abnormal behavior (Fig. 1) that was considerably different from δ(Н) curves found for bulk metal-insulator nanocomposite [6]. The similar pattern was observed for the same chemical composition films, where nanocomposite had been before percolation threshold [1][2][3].…”

“…MO properties of the multilayered films are determined by the competition of two contributions from this composites, content of FM phase in which complicated manner depends on the constituent layers thicknesses. Sputtering process parameters determine thickness of the nanocomposite layers and granules size [6]. Simultaneously Si interlayer thickness determine number of combined granules i.e.…”

Peculiarities of the Interface Forming in the “Nanocomposite-Bismuth Telluride” Multilayer System

“…2) one may see that adding a thin layer of spacer makes system more soft-magnetic. MO-response for layer-by-layer deposited nanocomposites is known [4] to depend on the thicknesses of the layers. That's why we also carried out research on changes of the MO properties for nanocomposites deposited layer-by-layer without any spacer in order to determine, whether the thickness of a composite layer anyhow contributes the TKE.…”