Open AccessDisaccommodation of magnetic spectra of two manganese zinc ferrites
Author(s) -
A.L. Rasmussen
Publication year - 1965
Publication title -
journal of research of the national bureau of standards. section a. physics and chemistry
Language(s) - English
Resource type - Journals
eISSN - 2376-5704
pISSN - 0022-4332
DOI - 10.6028/jres.069a.020
Subject(s) - manganese , nuclear magnetic resonance , demagnetizing field , ferrite (magnet) , spectral line , materials science , zinc , maxima , analytical chemistry (journal) , magnetic field , condensed matter physics , chemistry , physics , magnetization , art , chromatography , quantum mechanics , astronomy , performance art , metallurgy , composite material , art history
Disaccommodation of the complex susceptibility (time change after demagnetization) of two manganese zinc ferrite materials of the composition Mn 0.597 Zn 0.265 Fe 2.07 O 4 and Mn 0.584 Zn 0.353 Fe 2.05 O 4 was studied in response to demagnetizing frequency and rate, temperature, frequencies of ~20 kHz to ~2000 kHz, and rf magnetic field intensities of ~10 -4 oersted and ~10 -2 oersted. Precise susceptibility spectra near -10.0 °C show that the resonance maxima shift to higher frequency and decrease in magnitude with increasing time after demagnetization and that the disaccommodation rate varies considerably and changes sign with frequency. Activation energies of the order of 0.8 electron volt were computed at 100 kHz.