A phenomenological theory of damping in ferromagnetic materials

Author

Gilbert, Thomas L.

Author_Institution

Armour Res. Found., Chicago, IL, USA

Volume

40

Issue

6

fYear

2004

Firstpage

3443

Lastpage

3449

Abstract

In 1955, a phenomenological theory of ferromagnetism was well established and had been corroborated by a considerable amount of experimental data. However, there were problems in the phenomenological theory of the dynamics of the magnetization field. The Landau-Lifshitz equation for damping of the motion of the magnetization field could not account for the large noneddy-current damping in thin Permalloy sheets. The problem undertaken herein is a reformulation of the theory in a way that is more consistent with the theory of damping in other physical systems in order to be able to take large damping into account.

Keywords

damping; eddy current losses; ferromagnetic materials; damping theory; ferromagnetic damping; ferromagnetic materials; magnetic core memories; magnetic domains; magnetic losses; magnetic recording; magnetization processes; phenomenological theory; Damping; Eddy currents; Energy loss; Equations; Extraterrestrial measurements; Lattices; Magnetic domains; Magnetic field induced strain; Magnetic materials; Magnetization; 65; Ferromagnetic damping; ferromagnetic materials; magnetic core memories; magnetic domains; magnetic losses; magnetic recording; magnetization processes;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2004.836740

Filename

1353448