Ferromagnetic resonance relaxation in reaction milled and annealed Fe-Zn nanocomposites

Author

Pardavi-Horvath, M. ; Swartzendruber, L.J.

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., George Washington Univ., Washington, DC, USA

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

3502

Lastpage

3504

Abstract

SQUID magnetization measurements and ferromagnetic resonance experiments have been performed at 9.77 GHz on reaction milled and subsequently annealed nanocomposites of iron particles in a ZnO matrix. The dominant contribution to the temperature and time dependence of the observed linewidth of 2.2 to 3.2 kOe arises from the spatial inhomogeneity in shape, size and interaction fields of the system. Further linewidth contributions from stress, magnetization changes, surface reconstruction are discussed. The Gilbert relaxation constant α is decreasing with annealing temperature from 0.45 to 0.33 at 304 C

Keywords

annealing; composite materials; ferromagnetic resonance; iron alloys; magnetisation; nanostructured materials; zinc alloys; 304 C; 9.77 GHz; Fe-Zn; Fe-Zn nanocomposites; Gilbert relaxation constant; annealed; ferromagnetic resonance relaxation; magnetization changes; reaction milled; spatial inhomogeneity; surface reconstruction; temperature dependence; time dependence; Annealing; Iron; Magnetic resonance; Magnetization; Nanocomposites; Particle measurements; Performance evaluation; SQUIDs; Temperature dependence; Zinc oxide;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800570

Filename

800570