N. E. Syr’ev

Features of Magnetic Properties and FMR of CoFeZr/Si Layered Nanosystems due to Their Inner Structure

Static magnetic properties, ferromagnetic resonance (FMR) and glancing angle X-ray diffraction spectra (GAXRD) of CoFeZr (tm)/Si (tSi) in multilayer nanosystems were investigated for two groups of the samples characterized by tm = 2 3 nm, tSi = 0.5 5 nm and by tm = 7 12 nm, tSi = 5 13 nm. A computer simulation of GAXRD spectra of multilayer interference structures has been performed taking into account the possibility of silicides formation at metal-Si interfaces. Matter of discussion is the layer and interlayer thickness below which a resonance response corresponds to that of an effective medium rather than of an individual magnetic layer.

Studying the internal structure of granular magnetic nanocomposites by ferromagnetic resonance

A method for estimating the form of magnetic nanoparticles in composite film structures based on the observation of ferromagnetic resonance phenomenon is offered. Within the model of the effective medium, an explanation is given for experimentally observed concentration and temperature dependences of resonant fields for composite nanosystem (Co45Fe45Z10)f+(Al2O3)100−f.

Low-field magnetic resonance in granular nanostructures

A series of (CoFeB) + (SiO2) magnetic film samples was investigated by ferromagnetic resonance. The magnetic resonance in low fields was experimentally observed. The influence on the position and width of the low-field peak of the magnetic phase concentration in nanofilms and of the registration parameters of a spectrum were established.

Magnetic and Magnetoresonance Properties of Multilayered Systems Based on (CoFeB)x-(SiO2)100-x Composite Layers

Magnetic properties and ferromagnetic resonance data of (Co41Fe39B20)x-(SiO2)100-x composite films and multilayer structures composed of these films separated by SiC interlayers have been studied. It has been shown that one of the possible causes responsible for the differences of magnetic properties of composites and multilayer structures can be different shapes of magnetic particles and granules in these materials.

Influence of Si on the magnetic properties of multilayer nanostructures with composite magnetic layers

The static and dynamic properties of multilayer structures [(Co45Fe45Zr10)m(Al2O3)100 − x]x/(a-Si)y with various magnetic phase concentrations and for different thicknesses x and y were measured. It was shown that for samples with comparatively thick composite layers and thin interlayers (x/y > 8), the silicides that form play no significant role and the magnetic properties are determined by the composites. With an increase in the thickness of the interlayers, more granules form silicides. This reduces the concentration of the magnetic phase, influencing the samples’ resonance fields and magnetization.

The Features of TKE and FMR in Nanocomposite-Semiconductor Multilayers

Magnetic and magneto-optical properties of multilayers based on the (Co45Fe45Zr10)Z(Al2O3)100-Z composite and amorphous hydrogenated silicon with various thicknesses both of magnetic and semiconductor layers have been investigated. The nonlinear dependence of magnetic and MO characteristics of the nanostructures on the thickness of layers was found. The interface formed on the boundary of two phases (the ferromagnetic granules and the semiconductor ones) strongly influences the magnetic and MO properties of the structures with thin Si layers.

Using magnetic resonance characteristics to model the structure of multilayer composite nanosystems

The magnetic resonance characteristics of multilayer composite nanosystems with dielectric, semiconductor, and metal nonmagnetic interlayers are investigated. Analysis of the experimental data shows that the dominant factor determining the magnetic resonance characteristics of multilayer composite nanosystems is the shape of their magnetic granules.

Combined analysis of static and dynamic magnetic characteristics of multilayer CoFeZr/α-Si nanostructures

The combined method of static and dynamic magnetic measurements is used to study nano-dimensional multilayer amorphous CoFeZr/α -Si films. It is established that at the thickness of magnetic layers x = 5–12 nm their magnetization does not differ from that of the bulk material. It is shown that as x is lowered to 2–3 nm, the magnetization of magnetic layers decreases, which may be due to the formation of mixed layers containing nonmagnetic silicides. At a thickness of nonmagnetic interlayers of less than 1 nm the features characteristic of a weak antiferromagnetic interaction of neighboring layers are observed.

Peculiarities of the ferromagnetic resonance in multilayer CoFeZr-α-Si films

The static magnetic properties and ferromagnetic resonance spectra of multilayer CoFeZr-α-Si films with different numbers and thicknesses of magnetic and nonmagnetic layers have been investigated. It is established that the shape of the ferromagnetic resonance spectrum and the resonant fields Hres depend on the thickness of nonmagnetic layers and their total number. The character of changes in the spectrum makes it possible to estimate the quality of layers and interfaces.

Magnetoresonance Properties of an AlSiFe-Based Composite Film System

The magnetoresonance properties of a composite film system based on alsifer nanoparticles in a polymer matrix are studied. It is shown that the system has uniaxial anisotropy of magnetic properties in a sample’s plane. The magnitude and orientation of the field of anisotropy upon varying the alsifer concentration do not change appreciably.