Abstract
The extraordinary waves in spin-1/2 quantum plasma are studied. The evolutions of spin-up and spin-down electrons are considered separately. Hence, the separate spin evolution quantum hydrodynamics is used as the tool of research. It is demonstrated that the spin polarization of electrons modifies the spectrum of the lower extraordinary wave (LEW). An increase of the frequency at the large wave vector due to the spin modified Fermi pressure is found for the cyclotron frequency smaller than the Langmuir frequency. Existence of the extraordinary spin electron acoustic wave (SEAW) is demonstrated. Spectrum of the extraordinary SEAW is calculated. This spectrum is located below the spectrum of the LEW for the cyclotron frequency smaller than the Langmuir frequency and the spectrum located between spectrums of the upper extraordinary wave and the LEW for the cyclotron frequency larger than the Langmuir frequency. Presence of the extraordinary SEAW spectrum in the area usually occupied by the LEW spectrum decre...
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