Multifunctional operation of the double-layer ferromagnetic structure coupled by a rectangular nanoresonator

TL;DR

This paper introduces a ferromagnetic layered system with a rectangular nanoresonator that enables advanced control of spin wave propagation, including filtering and circulator functions, crucial for future magnonic signal routing.

Contribution

It presents a novel coupled ferromagnetic structure with a rectangular resonator that achieves multifunctional control of spin waves, including add-drop filtering and circulation.

Findings

Demonstrates control of spin wave propagation modes.

Shows transfer of spin waves between layers with directionality.

Achieves functionalities essential for magnonic signal routing.

Abstract

The use of spin waves as a signal carrier requires developing the functional elements allowing for multiplexing and demultiplexing information coded at different wavelengths. For this purpose, we propose a system of thin ferromagnetic layers dynamically coupled by a rectangular ferromagnetic resonator. We show that a single and double, clockwise and counter-clockwise, circulating modes of the resonator offer a wide possibility of control of propagating waves. Particularly, at frequency related to the double-clockwise circulating spin-wave mode of the resonator, the spin wave excited in one layer is transferred to the second one where it propagates in the backward direction. Interestingly, the wave excited in the second layer propagates in the forward direction only in that layer. This demonstrates add-drop filtering, as well as circulator functionality. Thus, the proposed system can become an important part of future magnonic technology for signal routing.