Title :
FMR study of reduced Ba-ferrite
Author :
Yu, Y. ; Harrell, J.W. ; Kitahata, S.
Author_Institution :
Dept. of Phys. & Astron., Alabama Univ., Tuscaloosa, AL, USA
fDate :
11/1/1995 12:00:00 AM
Abstract :
FMR spectra and saturation magnetization versus temperature curves have been measured in Co-Ti-Sn substituted Ba-ferrite samples which have been reduced in a hydrogen atmosphere at temperatures up to 380°C. In general, except for the starting material and the samples which have been reduced at 380°C, the FMR spectra and the Ms versus temperature curves can be represented as a sum of non-interacting Ba-ferrite and α-Fe components. A model has been developed to explain the tilted easy axis which has been previously observed from torque curves which assumes a non-interacting mixture of Ba-ferrite with first-order uniaxial anisotropy and α-Fe with both crystalline and negative shape anisotropies
Keywords :
barium compounds; ferrites; ferromagnetic resonance; magnetic anisotropy; magnetic particles; magnetisation; reduction (chemical); 280 to 380 C; 50 to 450 C; BaFe12O19; Co-Ti-Sn substituted Ba-ferrite samples; FMR spectra; H2 atmosphere reduction; crystalline anisotropy; first-order uniaxial anisotropy; magnetization versus temperature curves; negative shape anisotropies; noninteracting mixture; particulate media; reduction temperature; saturation magnetization; tilted easy axis; Anisotropic magnetoresistance; Atmosphere; Atmospheric measurements; Atmospheric modeling; Hydrogen; Magnetic materials; Magnetic resonance; Saturation magnetization; Temperature; Torque;
Journal_Title :
Magnetics, IEEE Transactions on
