Fizika Nizkikh Temperatur: Volume 43, Number 11 (November 2017), p. 1565-1574 ( to contents , go back )
Longitudinal magnetization dynamics in Heisenberg magnets: Spin Green functions approach (Review Article)
Donetsk Institute for Physics and Engineering the National Academy of Sciences of Ukraine 46 Nauki Avenue, Kyiv 03028, Ukraine
Received March 29, 2017
In spite of the fact that dynamical properties of magnets have been extensively studied over the past years, the longitudinal magnetization dynamics is still much less understood than transverse one even in the equilibrium state of a system. In this paper, we give a review of existing, based on quantum-mechanical approach, theoretical descriptions of the longitudinal magnetization dynamics for ferro-, ferri- and antiferromagnetic dielectrics. The aim is to reveal specific features of this type of magnetization vibrations under description a system within the framework of one of the basic model theory of magnetism— the Heisenberg model. Related experimental investigations as well as open questions are also briefly discussed. We hope that understanding of the longitudinal magnetization dynamics distinctive features in the equilibrium state have to be a reference point for a theory uncovering the physical mechanisms that govern ultrafast spin dynamics after femtosecond laser pulse demagnetization when a system is far beyond an equilibrium state.
PACS: 75.78.–n Magnetization dynamics;
Key words: longitudinal magnetization dynamics, spin Green functions, Heisenberg magnets.
Published online: September 25, 2017