Magnetostatic modes of lateral magnetic superlattices in an applied field of arbitrary direction

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We discuss the properties of magnetostatic surface modes of a lateral superlattice in an applied static field (${\mathbf{H}}_{0}$) of arbitrary direction. In contrast to earlier works, we find that depending on the direction of the field, the surface modes also can exist for the magnetic fraction ${\mathrm{f}}_{1}$0.5, and the critical value of ${\mathrm{f}}_{1}$ as a function of the field is obtained. The surface mode can only propagate in an angle wedge whose width and position are determined by ${\mathbf{H}}_{0}$ and the critical value of the propagation angle. The computed dispersion curves show that the mode's frequency changes dramatically when the direction of ${\mathbf{H}}_{0}$ is adjusted.