The influence of geometrical dimensions of the yttrium-iron garnet plate (thickness), geometry and intensity of applied bias and alternating magnetic fields on the efficiency of ultrasound generation is researched. Experiments revealed resonant-dimensional effects, which cannot be described in terms of existing theory. A hypothesis of involvement of domain borders oscillations into ultrasound generation is suggested.
Show AbstractIn our days increased interest in materials that demonstrate the coupling between the magnetic and electrical properties. This work is devoted to the study of one of the manifestations of the magnetoelectric interaction: movement of magnetic domain walls under the influence of an electric field. This effect can find practical applications for new kinds of magnetic storage devices, based on controlled movement of domain walls.
Show AbstractUltrafast temporal evolution of the third harmonic generated by a fishnet metamaterial was studied using the pump-probe technique. The experimental data indicate the existence of a delay in the nonlinear response of the metamaterial. The delay is attributed to the ultrafast relaxation processes in gold characterized by a time constant of 1 ps that is comparable to the electron-phonon relaxation time.
Show AbstractThe results of Andreev spectroscopy studies show that in mercury cuprates Hg-1201 (sigle-layer phase) and Hg-1212 (two-layer phase) superconductivity has a single-gap character. Qualitatively different results were obtained for a three-layer phase Hg-1223. In slightly overdoped polycrystalline samples Hg-1223 (Tc = 124 ± 5 K) two superconducting gaps were observed corresponding to one internal (IP) and two outer (OP) CuO2 – planes. The existence of multigap superconductivity in mercury cuprates HgBa2Can-1Cun02n +2 + δ with n ≥ 3 is explained by the difference in doping levels of external (OP) and internal (IP) CuO2 - planes.
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