Strong coupling of quantized spin waves in ferromagnetic bilayers
Mesoscale and Nanoscale Physics
2021-03-16 v2 Materials Science
Computational Physics
Abstract
We formulate a strong-coupling theory for perpendicular standing spin waves (PSSWs) in ferromagnetic bilayers with the interlayer exchange coupling (IEC). Employing the Hoffmann boundary condition and the energy-flow continuity across the interface, we show that the PSSWs are still quantized but with non-integral quantum numbers, in sharp contrast to that of a single layer. The magnon-magnon coupling is characterized by the spectrum splitting which is linear with the IEC in the weak-coupling region, but getting saturated in the strong-coupling limit. Analytical predictions are verified by full micromagnetic simulations with good agreement.
Keywords
Cite
@article{arxiv.2010.14981,
title = {Strong coupling of quantized spin waves in ferromagnetic bilayers},
author = {Zhizhi Zhang and Huanhuan Yang and Zhenyu Wang and Yunshan Cao and Peng Yan},
journal= {arXiv preprint arXiv:2010.14981},
year = {2021}
}