Measurement results of the acoustoelectric effects (surface acoustic waves (SAW) attenuation and velocity) in a high-mobility p-SiGe/Ge/SiGe structure are presented. The structure was LEPECVD grown with a two dimensional (2D) channel buried in the strained Ge layer. The measurements were performed as a function of temperature (1.5 -4.2 K) and magnetic field (up to 8.4 T) at different SAW intensities at frequencies 28 and 87 MHz. Shubnikov-de Haas-like oscillations of both SAW attenuation and the velocity change have been observed. Hole density and mobility, effective mass, quantum and transport relaxation times, as well as the Dingle temperature were measured with a method free of electric contacts. The effect of heating of the 2D hole gas by the electric field of the SAW was investigated. Energy relaxation time τε and the deformation potential constant determined.
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.
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.
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