Title :
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
fDate :
9/1/1999 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
