Magnetic after-effect and ferromagnetic resonance in LiZnTiMn-ferrites

Ferromagnetic resonance linewidths at room temperature for Li0.79Zn0.25Ti0. 83Fe((1.08-k))Mn0.05O4 polycrystallino ferrites sintered in oxygen atmosphe re at 1050 degreesC with k ranging from 0.00 to 0.10 are presented. The lin ewidths measured in these samples are comparable to most of commercial ferr ites. Their values decrease with increasing k from 53 to 40 Oe. Magnetic af ter-effect spectra are also presented from 77 to 300 K. A relaxation proces s, whose amplitude decreases with increasing k, is observed at 250 K. A rel ationship between ferromagnetic resonance linewidth and magnetic after-effe ct spectra is presented. (C) 2001 Elsevier Science B.V. All rights reserved .