DocumentCode :
1155561
Title :
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
Link To Document :
بازگشت