Satellite peaks analogous to superlattice peaks have been observed for both corrugated InP substrates and for such substrates overgrown with epitaxial InGaAsP. These satellites are entirely due to the corrugations. High-resolution x-ray diffraction using extremely asymmetric reflections in the glancing exit configuration was used. A kinematical expression for the intensities of the satellite peaks is derived for strain-free structures.

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%'e have measured saturation magnetization, ferromagnetic resonance linewidth, effective g factor, and magnetocrystalline anisotropy coefficients on single-crystal samples of praseodymium iron garnet (PrIG) and neodymium iron garnet (NdIG). Saturation magnetizations were measured from 77 to 550 K. The other properties were measured from 150 to 350 K in PrIG and from 200 to 450 K in NdIG. PrIG has a positive first-order magnetocrystalline anisotropy coefficient in contrast with all the other single rare-earth iron garnets. Our results support the idea that the contributions to linewidth and amsotropy of praseodymium and neodymium ions in an iron garnet lattice vary with lattice parameter.

A formula is derived for simulating rocking‐curve measurements made with an X‐ray diffractometer fitted with a four‐reflection monochromator. The derivation is carried out both graphically and algebraically. Results of a simulation using this formula are then compared with experimentally obtained rocking curves. The rocking curves were obtained using a diffractometer with a four‐reflection monochromator that uses 440 reflections from two channel‐cut germanium crystals. The experimental data comprise 200, 400, 600, 511, 711, 622, 422 and 444 reflections from thick single‐crystal indium phosphide grown by the vertical‐gradient freeze technique. The simulated data correlate well with the experimental data, although the simulations consistently show somewhat higher reflectivities and narrower linewidths than the experiment, indicating the existence of broadening mechanisms not included in the simulation that are affecting the experiment.

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