Reciprocal Space Approach to Dipolarly Coupled Magnetic Hetero-Structures

TL;DR

This paper introduces an analytical model for understanding spin-wave dynamics in magnetic heterostructures, especially garnet multilayers, emphasizing dipolar interactions and mode formation.

Contribution

The work provides a new formalism for predicting eigenfrequencies and mode shapes in dipolarly coupled magnetic multilayers, aiding magnonic device design.

Findings

Describes symmetric and antisymmetric spin-wave modes due to dipolar coupling.

Provides dispersion relations and interference phenomena in magnetic heterostructures.

Establishes a theoretical tool for designing dipolar magnonic devices.

Abstract

We present an analytical framework capable of describing spin-waves dynamic in magnetic hetero-structures composed of a pair of exchange-decoupled magnetic layers separated by a nonmagnetic spacer, focusing in particular on garnet-based multilayers. The model captures the formation of collective spin-wave modes, namely symmetric and antisymmetric, arising from dipolar coupling and provides direct access to the dispersion relation of the system and consequent interference phenomena. This formalism establishes a versatile theoretical tool for the predictive design of dipolarly coupled magnonic devices, providing access to their eigenfrequencies and mode shapes.