Magnetic excitations in iron pnictides

TL;DR

This paper investigates magnetic excitations in iron pnictides, revealing that their spin wave behavior can be explained by mechanisms typical of metallic magnets, including carrier-induced couplings and spin-charge interactions.

Contribution

It provides a detailed understanding of magnetic excitations in iron pnictides using itinerant electron models, emphasizing the roles of various physical mechanisms.

Findings

Magnetic excitations are consistent with metallic magnet mechanisms.

Carrier-induced ferromagnetic couplings are significant.

Spin-charge coupling influences magnetic behavior.

Abstract

Spin wave dispersion and damping are investigated in the metallic SDW state of different itinerant electron models including a small interlayer hopping. Magnetic excitations in iron pnictides are shown to be well understood in terms of physical mechanisms characteristic of metallic magnets, such as carrier-induced ferromagnetic spin couplings, intra-band particle-hole excitations, and the spin-charge coupling mechanism, which is also important in ferromagnetic manganites.