Abstract
Nonlinear magnetosonic waves in degenerate plasmas are discussed by using the spin-1/2 quantum magnetohydrodynamics model. Spin effects are incorporated via spin force and macroscopic spin magnetization current. Using both the reductive perturbation and Sagdeev potential techniques to derive the nonlinear evolution equations. In the limited amplitude a Kadomstev-Petviashvili equation and in arbitrary amplitude an energy integral equation involving Sagdeev potential are derived. The effects of electron spin magnetization, quantum diffraction and plasma statistic (temperature degeneracy) are discussed on the profile of solitons. The importance of the work relevant to compact astrophysical bodies is pointed out.
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