The Influence of the Percolation Transition on the Electric Conductive and Optical Properties of Ultrathin Metallic Films

Physics of the Solid State - The results of the study of the peculiarities of changes in the electrophysical, optical, and plasmonic properties of ultrathin metallic films during the percolation...     

Magnetoelastic waves in parametrically active nickel ferrite spinels

The effect of composition of polycrystalline ferrites based on nickel ferrite on the magnetoelastic coupling in the ultrasonic frequency range was experimentally investigated. The dependences of the velocities of magnetoelastic waves on the magnetizing field were measured. The maximum values of the magnetoelastic coupling coefficient (59%) and the sensitivity of transverse sound velocity to variations in magnetic field (0.1%Oe⁻¹) were obtained for ferrites of the Fe_2.026Ni_0.95Co_0.024O₄ composition.     

Bi-Substituted Iron Garnet Films for Thermomagnetic Recording,Photonics, and Plasmonics: Optimization of Synthesis Conditions Using Scanning Probe Microscopy

Technical Physics - We present the results of studies on the optimization of the synthesis of Bi-substituted iron garnet (Bi : IG) films by liquid-phase epitaxy and vacuum deposition followed by...     

One-dimensional magnetophotonic crystals with magnetooptical double layers

One-dimensional magnetophotonic microcavity crystals with nongarnet dielectric mirrors are created and investigated. The defect layers in the magnetophotonic crystals are represented by two bismuth-substituted yttrium iron garnet Bi:YIG layers with various bismuth contents in order to achieve a high magnetooptical response of the crystals. The parameters of the magnetophotonic crystal layers are optimized by numerical solution of the Maxwell equations by the transfer matrix method to achieve high values of Faraday rotation angle Θ _F and magnetooptical Q factor. The calculated and experimental data agree well with each other. The maximum values of Θ _F =–20.6°, Q = 8.1° at a gain t = 16 are obtained for magnetophotonic crystals with m = 7 pairs of layers in Bragg mirrors, and the parameters obtained for crystals with m = 4 and t = 8.5 are Θ _F =–12.5° and Q = 14.3°. It is shown that, together with all-garnet and multimicrocavities magnetophotonic crystals, such structures have high magnetooptical characteristics.     

Supercritical dynamics of magnetoelastic wave triad in a solid

Parametric coupling of three traveling waves is studied numerically on an example of magnetoelastic waves in a highly anharmonic antiferromagnetic crystal. The physical mechanism of coupling is explained as a result of modulation of the nonlinear elastic moduli of the crystal by RF electromagnetic pumping. Parametric interaction of a coupled wave triad with homogeneous pumping field results in an instability of explosive type. Above the threshold of instability, the amplitudes of waves increase to occurrence of singularity in finite time. Explosion is accompanied by spatial localization of wave envelopes. The supercritical dynamics of a wave triad is simulated numerically taking into account the third- and fourth-order magnetoelastic anharmonicity of the medium. Violation of the explosive scenario by nonlinear phase mismatch between the coupled waves and pumping field is demonstrated. Modulation of the pumping phase in time is considered as a tool to compensate for the nonlinear mismatch and recondition the explosive amplification and spatial localization of wave triads. A proper phase modulation law is found in a numerical experiment.     

Magnetic field effect on the critical EPR-dynamics of the cubic ferromagnets CdCr2Se4 and CdCr2S4

We present measurements of the critical behaviour of the EPR linewidths at frequencies 9.21 and 35.5 GHz. In the exchange critical region above T_c (4πx ? 1) the strong field dependence of the linewidths is observed, even when the field variation of susceptibility x is small. This phenomenon is explained by the spin diffusion effect on the linewidth. The spin diffusion coefficients D for CdCr₂Se₄ and CdCr₂S₄ are determined from the linewidths data. The temperature dependence D is found to be consistent with the predictions of the dynamical scaling theory.     

Profile Analysis of Ferrite–Garnet Films by Glow-Discharge Optical Emission Spectroscopy

Technical Physics - The results of experiments on the application of the method of glow discharge optical emission spectroscopy for the profile analysis of vacuum-deposited single- and double-layer...     

Vertical Displacement of the Magnetooptical Hysteresis Loop in the Magnetoplasmonic Nanocomposite

Physics of the Solid State - The results of synthesis and investigation of magnetooptical (MO) properties of thin-film magnetoplasmonic nanocomposite, which is a layer of bismuth-substituted iron...