Comment on "Composite excitation of Josephson phase and spin waves in ferromagnetic Josephson junctions" (S.Hikino, M.Mori, S.Takahashi, and S.Maekawa, arXiv:1009.3551)

TL;DR

This paper critically examines the quasistatic approximation in ferromagnetic Josephson junctions, confirming its high accuracy in realistic experimental conditions and clarifying its applicability for coupled spin and plasma wave predictions.

Contribution

It provides a detailed validation of the quasistatic approximation's accuracy in ferromagnetic Josephson junctions, addressing previous claims about its limitations.

Findings

Quasistatic approximation is highly accurate in realistic systems.

Contradicts previous claims about the approximation's limitations.

Supports the existence of coupled spin and plasma waves in SIFS junctions.

Abstract

We clarify the applicability of the quasistatic approximation used in Ref. [\onlinecite{VE}], where coupled spin and Josephson plasma waves have been predicted to exist in SIFS Josephson junctions. We show, contrary to the claim of the authors of Ref. [\onlinecite{Maekawa}], that this approximation is very accurate in realistic systems studied experimentally.