Abstract
The results of complex studies of structural-phase transformations and magneto-optical properties of nanocomposites (CoFeZr)x (MgF2)100−x depending on the metal alloy content in the dielectric matrix are presented. Nanocomposites were deposited by ion-beam sputtering onto glass and glass-ceramic substrate. By studying the spectral and field dependences of the transversal Kerr effect (TKE), it was found that the transition of nanocomposites from superparamagnetic to the ferromagnetic state occurs in the region of xfm~30 at%, that corresponds to the onset the formation of ferromagnetic nanocrystals CoFeZr with hexagonal syngony in amorphous dielectric matrix of MgF2. With an increase of concentrations of the metal alloy for x > xfm, the features associated with structural transitions in magnetic granules are revealed in the TKE spectra. Comparison of the spectral and concentration dependences of TKE for nanocomposites on the glass and glass-ceramics substrates showed that the strongest differences occur in the region of the phase structural transition of CoFeZr nanocrystals from a hexagonal to a body-centered cubic structure at x = 38 at.% on the glass substrates and at x = 46 at.% on glass-ceramics substrates, due to different diffusion rates and different size of metal nanocrystals on amorphous glass substrates and more rough polycrystalline glass-ceramics substrates.
Highlights
The continuing interest in nanocomposite (NC) materials is due to the modification of the known metals and alloys properties during their transition to the nanocrystalline state
The object of intensive experimental and theoretical research is the influence of the phase composition and microstructure of nanocomposites, which are realized in the process of self-organization of atoms during their fabrication, on the magnetic, magneto-transport and magneto-optical properties of nanomaterials [4]
This paper presents the results of the study for two series of nanocomposite films (CoFeZr)x (MgF2 )100−x with metal granules of the CoFeZr alloy in the MgF2 dielectric matrix on glass and glass-ceramics substrates within the range of changes in the nominal values of x calculated from the geometry of the composites deposition, x = 9–51 at.%, including the percolation threshold [4]
Summary
The continuing interest in nanocomposite (NC) materials is due to the modification of the known metals and alloys properties during their transition to the nanocrystalline state. The object of intensive experimental and theoretical research is the influence of the phase composition and microstructure of nanocomposites, which are realized in the process of self-organization of atoms during their fabrication, on the magnetic, magneto-transport and magneto-optical properties of nanomaterials [4]. All these properties of nanocomposites appreciably depend on their composition and microstructure, especially on the shape and size of metal granules, on their distribution over the sample volume, and primarily on the concentration of the magnetic metal phase. All the unique physical properties that are inherent to granular composites are more pronounced [11]
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