Magnetic Properties of (Cr_1-xFe_x)O₂

Abstract

The nonlinear Thomson backscattering in a circularly polarized Gaussian laser pulse is investigated and spectral characteristics of the emission are discussed. It is indicated that the frequency of the emitted light is up-shifted by the nonlinear doppler effect. By using a properly focused laser beam or putting the electron before the focus, the variety of the nonlinear Doppler shift during the interaction can be minimized and quasimonochromatic x-rays are generated. Taking into account the emission power, the optimum situations for generating quasimonochromatic x-rays are explored.

Synthesis of single-domain chromium dioxide nanoparticles with high coercivity

“…Simultaneously the σ M value decreased, and H C increased from 522 (z 0) to 761 Oe (z 75) and further smoothly decreased to 622 Oe. The observed changes of structure parameters and σ M coincided with the data reported in [2] and were assigned to the formation of the а Cr 1-x Fe x O 2 solid solution, the electroneutrality being maintained by chromium transformation in the Cr(V) state [2] or by the appearance of oxygen vacancies, the Fe(III) magnetic moment being antiparallel to that of CrO 2 . Moreover, part of Fe(III) atoms was present in the prepared powder in the form of (Cr 1-x Fe x ) 2 O 3 solid solution, its formation being confirmed by X-ray diffraction and nuclear gamma resonance spectroscopy [3].…”