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This paper investigates spin wave reflection at ferromagnetic junctions by applying the principle of continuity of angular momentum density flux. This theoretical framework analytically derives reflection coefficients and stationary wave envelopes, offering a mechanism to minimize losses and interferences in magnonic devices. The derived analytical expressions show excellent agreement with full micromagnetic simulations, validating the approach.
Spin wave reflection at ferromagnetic junctions is analytically predictable using angular momentum flux continuity, enabling precise control and loss minimization in magnonic devices.
Magnonics investigates the dynamic excitations of magnetically ordered media, known as spin waves, and their application in functionalized devices. To efficiently control spin wave based devices minimizing losses and interferences from unwanted reflections, a clear picture of the scattering mechanism is needed. Here, we focus on the reflection of spin waves produced at the interface between two ferromagnetic media. We show that it is possible to understand the reflection mechanism based on the continuity of the angular momentum density flux. This constraint allows us to analytically compute the reflection coefficient and the stationary wave envelope in the first medium, as well as the damped propagation in the second. In addition, the analytical expressions are compared with full micromagnetic simulations, showing excellent agreement.