Absorption of Electromagnetic Radiation by Systems with a Noncollinear Magnetization Distribution

The high-frequency absorption of electromagnetic radiation in systems with a noncollinear spatial magnetization distribution has been calculated. A medium with a helicoidal magnetic structure and a super-lattice whose period contains two layers with noncollinear magnetizations are considered. An additional absorption peak related to the electron transitions from one spin subband to another under the action of a variable linearly polarized electric field is shown to appear in such systems at frequencies near the spin splitting of the conduction band.