Investigation of the Magnetic Properties of Amorphous Multilayer Nanostructures [(CoFeB)60C40/SiO2]200 and [(CoFeB)34(SiO2)66/C]46 by the Transversal Kerr Effect

Abstract

Magnetic properties in amorphous multilayer nanostructures [(CoFeB)₆₀C₄₀/SiO₂]₂₀₀ and [(CoFeB)₃₄(SiO₂)₆₆/C]₄₆ with different content of the CoFeB magnetic alloy in metal-composite layers and inverse location of non-metallic phases C and SiO₂ in composite layers or in interlayers, were investigated by magneto-optical methods in the transversal Kerr effect (TKE) geometry.
Using the spectral and field dependences of the transversal Kerr effect TKE, it has been established that in the samples of both magnetic multilayer nanostructures (MLNS) the magneto-optical response and magnetic order are determined by the phase composition of the composite layers.
In samples of MLNS [(CoFeB)₆₀C₄₀/SiO₂]₂₀₀ with a post-percolation content of metal clusters in metal-composite layers, the maximum of absolute TKE values decrease by about 2.5 times compared with the initial amorphous Co₄₀Fe₄₀B₂₀ alloy, while the field dependences of TKE in samples of this MLNS has features that are characteristic of soft ferromagnets.
In samples of MLNS [(CoFeB)₃₄(SiO₂)₆₆/C]₄₆ with a pre-percolation content of metal clusters in the oxide SiO_2–x matrix of metal-composite layers, the TKE spectral dependences fundamentally differed from the TKE of the initial amorphous Co₄₀Fe₄₀B₂₀ alloy both in shape and sign. The field dependences of the TKE in the samples of this MLN were linear, characteristic of superparamagnets.

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