Abstract
The method of two-time Green's functions is used to calculate the natural oscillations of the longitudinal component of the spontaneous magnetization of a ferromagnet. The spectrum of these oscillations or spin waves has no gap, even when magnetic interactions are taken into account. For smallk the spectrum of longitudinal spin waves has the same properties as secondary excitations of the spin system of a ferromagnet In which the primary excitations are transverse (ordinary) spin waves.
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