Title :
Effect of the cation site occupancy on the magnetization reversal mechanism of hydrothermal barium ferrites
Author :
Corradi, A.R. ; Speliotis, D.E. ; Morrish, A.H. ; Pankhurst, Q.A. ; Zhou, X.Z. ; Bottoni, G. ; Candolfo, D. ; Cecchetti, A. ; Mazoli, F.
Author_Institution :
Magnox Inc., Pulaski, VA, USA
fDate :
11/1/1988 12:00:00 AM
Abstract :
It has been found that when barium ferrite particles were doped with Ti and Co, the magnetization reversal mechanism of the assembly changed from mostly coherent to fully incoherent. It is assumed that the change is caused by an actual physical disruption of the superexchange interactions between the magnetic Fe3+ ions in the S-R layers stacked along the c axis of the particles´ lattice. Support of the assumption is provided by Mossbauer spectra, which show very few or no Fe3+ ions in the bipyramidal 2b sites of the substituted materials
Keywords :
Mossbauer effect; barium compounds; cobalt compounds; crystal atomic structure of inorganic compounds; ferrimagnetic properties of substances; ferrites; iron compounds; magnetic properties of fine particles; magnetic recording; magnetisation reversal; superexchange interactions; titanium compounds; BaFe12-2xCoxTixO19; Fe3+ ions; Mossbauer spectra; S-R layers; bipyramidal 2b sites; c axis; cation site occupancy; ferrite particles; magnetization reversal mechanism; physical disruption; substituted materials; superexchange interactions; Assembly; Barium; Coercive force; Ferrites; Hysteresis; Magnetization reversal; Shape;
Journal_Title :
Magnetics, IEEE Transactions on
