我们把色散、无损耗旋磁材料体模的能带结构看作厄米本征值问题。进一步计算表明,该本征模式是一组正交完备基,并且可以用于严格计算有损耗时此种色散体系的本征模式。我们也给出了存在畴界时的边界模式通过该厄米矩阵来求解的方法,表明该模式具有单向传输的特性。 We consider the band structure of a dispersion, lossless loss-rotating magnetic body phantom as Hermitian eigenvalue problem. Further calculations show that this eigenmode is a set of orthonormal basis sets and can be used to rigorously calculate eigenmodes for such dispersive systems with loss. We also give a method of solving the boundary mode with domain boundaries by means of the Hermite matrix, which shows that the mode has the characteristics of unidirectional transmission.