Excitation of magnetostatic spin waves in ferromagnetic films

TL;DR

This paper derives exact expressions for the propagation and mutual impedance of magnetostatic spin waves in ferromagnetic films, considering arbitrary magnetization and anisotropy, providing a comprehensive spectral description.

Contribution

It introduces a complete analytical framework for magnetostatic spin wave propagation in ferromagnetic films with arbitrary magnetization and anisotropy.

Findings

Exact propagator expressions for linear magnetostatic waves

Mutual impedance formulas between antennas

Full spectral description of magnetostatic wave modes

Abstract

The torque equation of nonlinear spin dynamics is considered in the magnetostatic approximation. In this framework, exact expressions for propagator of linear magnetostatic waves in ferromagnetic film between two antennas and corresponding mutual impedance of the antennas are derived, under conditions of uniform but arbitrarily oriented static magnetization and arbitrary anisotropy. The results imply also full description of spectrum of the waves.