Exchange stiffness constant and effective gyromagnetic factor of Gd, Tb and Nd containing, amorphous rare earth-transition metal films

Author

Mathieu, C. ; Hillebrands, B. ; Raasch, D.

Author_Institution

2. Phys. Inst., Tech. Hochschule Aachen, Germany

Volume

30

Issue

6

fYear

1994

fDate

11/1/1994 12:00:00 AM

Firstpage

4434

Lastpage

4436

Abstract

The exchange stiffness constant and the effective gyromagnetic factor of amorphous Gd_13.5Tb_6.2Fe_80.3, Gd_21.2Co_78.8, Gd_19.4Nd_6.1Fe _74.5 and Gd_19.6Nd_10.3Fe_70.1 alloy films have been determined by Brillouin light scattering and from measurements of the domain wall energy. All samples, which show a constant Curie temperature of 465 K, exhibit the same exchange stiffness constant, as measured by Brillouin light. The obtained values of both methods agree Gd_13.5Tb_6.2Fe_80.3 and Gd _21.2Co_78.8 films, but not for the Nd containing films. The latter is attributed to a breakdown of the standard Bloch domain wall equation in Nd containing systems

Keywords

Brillouin spectra; amorphous magnetic materials; cobalt alloys; exchange interactions (electron); ferromagnetic materials; gadolinium alloys; gyromagnetic ratio; iron alloys; magnetic domain walls; magnetic domains; magnetic thin films; neodymium alloys; terbium alloys; 465 K; Brillouin light scattering; Gd_13.5Tb_6.2Fe_80.3; Gd_19.4Nd_6.1Fe_74.5; Gd_19.6Nd_10.3Fe_70.1; Gd_21.2Co_78.8; alloy films; constant Curie temperature; domain wall energy; effective gyromagnetic factor; exchange stiffness constant; standard Bloch domain wall equation; Amorphous materials; Brillouin scattering; Cobalt alloys; Electric breakdown; Energy measurement; Gyromagnetism; Iron alloys; Light scattering; Neodymium; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.334111

Filename

334111