Longitudinal magnetization dynamics in Heisenberg magnets: Spin Green functions approach

• Published in: Физика низких температур
• Date: 2018
• Main Author: Krivoruchko, V.N.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2018
• Subjects: Специальный выпуск К 80-летию со дня рождения А.И. Звягина
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/176229
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Longitudinal magnetization dynamics in Heisenberg magnets: Spin Green functions approach / V.N. Krivoruchko // Физика низких температур. — 2018. — Т. 44, № 11. — С. 1565-1574. — Бібліогр.: 56 назв. — англ.

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.