Features of Magneto-Optical Response on Multilayer Nanostructures {(Co₄₅Fe₄₅Zr₁₀)_Z(Al₂O₃)_100-Z/α-Si:H}_n

Abstract

Spectral and field dependencies of Transversal Kerr Effect (TKE) for [(Co45Fe45Zr10)Z(Al2O3)100-Z(X)/α-Si:H(Y)] n multilayers have been studied in the energy range 0.5 - 4.0 eV. It was found that TKE field dependencies in the nearest IR energy range exhibit anomalous behavior for structures only with thin Si layers and this behavior vanishes with increasing of the Si layer thickness. TKE spectra measured in small and large magnetic fields were essentially different. It was shown that magneto-optical response of multilayered structure composite-silicon is the sum of contributions from two composites: (Co45Fe45Zr10) - Al2O3 + Si + silicides and (Co45Fe45Zr10) - Si + silicides, which have a different sign of TKE in the nearest IR spectrum and their magnetic states depend both on composite and semiconducting layer thicknesses.

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

“…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]. In some cases δ(Н) curves reveal anomalies, such as the TKE sign reversal and the presence of local minimum of the effect in the small fields (Н < 100 Oe).…”

“…Active phase interaction makes difficulties in obtained results interpretation and limits the possibilities of application of the materals mentioned above. Previous studies of multilayer structures (ML) nanocomposites-silicon [(Co 45 Fe 45 Zr 10 ) Z (Al 2 O 3 ) 100-Z (X)/Si(Y)] n [1][2][3], where composite had been before percolation threshold, shown that silicon introduction led to anomalous behavior of electrical, magnetic and magneto-optical properties of ML with small thickness of Si (<2nm). In [3] supposed that TKE spectra and field dependences anomalies related with contributions competition between two composites: (Co 45 Fe 45 Zr 10 )+Al 2 O 3 +Si+Silicides and (Co 45 Fe 45 Zr 10 )+Si+Silicides.…”

“…It causes the strong interest to studies of multilayered films based on granular nanocomposite near the percolation treshold. Thus ML with the same chemical composition like in [3] were selected as a research objects. As a magnetic layer in this structure a granular nanocomposite based on Co 45 Fe 45 Zr 10 alloy with concentrations near the percolation threshold was used.…”

Magneto-Optical Response Amplification In Multi-Layer Nanocomposite-Semiconductor Structures

“…Magneto-optical methods have several advantages, unlike optical ones, such as sensitivity to the presence of magnetic inhomogeneities, a particle shape and size changes, their volume distribution, and appearance of new magnetic phases in a nanostructure. Previous studies of nanocomposite-silicon multilayers [(Co 45 Fe 45 Zr 10 ) Z (Al 2 O 3 ) 100-Z (X)/Si(Y)] n [7][8][9] with composite concentrations near and under the percolation threshold have shown that the addition of silicon layers leads to anomalous behaviour of electrical, magnetic and magneto-optical properties of ML with small thickness of Si (< 2nm). In [9] it was assumed that TKE spectra and anomalies in field dependences were related to competition of contributions from several magnetic phases.…”

“…Previous studies of nanocomposite-silicon multilayers [(Co 45 Fe 45 Zr 10 ) Z (Al 2 O 3 ) 100-Z (X)/Si(Y)] n [7][8][9] with composite concentrations near and under the percolation threshold have shown that the addition of silicon layers leads to anomalous behaviour of electrical, magnetic and magneto-optical properties of ML with small thickness of Si (< 2nm). In [9] it was assumed that TKE spectra and anomalies in field dependences were related to competition of contributions from several magnetic phases. In the present work we focus on MO properties of nanocomposite-semiconductor multilayers (CoFeB) z (SiO 2 ) 100-z /Si and (CoFeB) z (SiO 2 ) 100-z /C with Z = 33.9 and 40 at.% a in order to trace the influence of the chemical composition and the thickness of ML layers on their MO behavior.…”