In a theoretical design study, we propose buried waveguides made of germanium or alloys of germanium and other group-IV elements as a CMOS-compatible platform for robust, high-gain stimulated Brillouin scattering (SBS) applications in the mid-infrared regime. To this end, we present numerical calculations for backward-SBS at 4 μm in germanium waveguides that are buried in silicon nitride. Due t...

Doping Ni80Fe20 by heavy rare earth atoms alters the magnetic relaxation properties of this material drastically. We show that this effect can be well explained by the slow relaxing impurity mechanism. This process is a consequence of the anisotropy of the on site exchange interaction between the 4f magnetic moments and the conduction band. As expected from this model the magnitude of the dampi...

A first report is given on a quasielastic neutron scattering experiment performed on a large single crystal of a-AgI. Time-of-flight spectra were taken at 250 OC, under different orientations of the crystal. The range of wavevector transfer was 1.0 A' 5 I Qo 1 6 1.8 A-' for elastic scattering. As in the case of polycrystalline material the spectra typically consist of a broad plus a narrow quas...

will occur with lower frequencies beginning with the fundamental frequency of rotation. The most interesting features of the materials here described have so far not even been touched upon.. The high dielectric constant and the enormous anisotropy could lend themselves to various sorts of experiments not feasible previously. The high dielectric constant would render observable some small effect...