Spin wave waveguides formed by domain walls in arrays of dipolarly coupled magnetic nanodots

Spin waves propagating in artificial magnetic periodic structures could be used for low-loss microwave signal processing. Arrays of dipolarly coupled magnetic nanodots having sufficient shape or/ and crystallographic anisotropy constitute such magnonic periodic structures that can operate without an external bias magnetic field and are dynamically reconfigurable [1]. Our previous work has shown that edges of finite arrays of magnetic dots can support propagation of edge spin-wave modes and those modes have many interesting physical properties, including strong localization and non-reciprocity [2]. It is also known that spin-wave modes can be localized not only at the physical edges of the arrays, but also at the internal boundaries inside the array defined, for example, by the regions of a non-uniform internal bias magnetic field or by the borders between the different ground states of the array — internal domain walls.