“…[35,36] Therefore, the high-frequency resonance mode related to the out-of-phase precession in the film with stripe domain structure is called the non-uniform precession mode instead of the optical resonance mode. [31,36,37] By employing the Landau Lifshitz's equation, [38] the Kittel's formula of the non-uniform precession mode under zero field can be replaced by [30,34,39,40]…”