Title :
Exchange bias in plasma-sprayed MnZn ferrite
Author :
Yan, Q.Y. ; Gambino, R.J. ; Baumberger, E. ; Lewis, L.H. ; Sampath, Sanjay
Author_Institution :
Mater. Sci. & Eng. Dept., Stony Brook Univ., NY, USA
fDate :
7/1/2004 12:00:00 AM
Abstract :
The antiferromagnetic phase FeO (wustite) forms in plasma-sprayed MnZn ferrites from pure spinel phase powder. An exchange bias is observed in hysteresis loops of both ferrite coatings and single splats; the exchange bias decreases and disappears with annealing. X-ray diffraction indicates that the wustite FeO changes to hematite Fe2O3 upon annealing. Annealing -induced cation ordering and diffusion influence the ferrite magnetic properties by increasing the saturation magnetization and decreasing the coercivity.
Keywords :
X-ray diffraction; annealing; antiferromagnetic materials; coercive force; ferrites; hysteresis; magnetisation; manganese compounds; plasma applications; Fe2O3; MnZn; MnZn ferrite; X-ray diffraction; annealing; antiferromagnetic phase; cation ordering; coercivity; diffusion; exchange bias; ferrite coatings; ferrite magnetic properties; hematite; hysteresis loops; plasma; pure spinel phase powder; saturation magnetization; single splats; wustite; Annealing; Antiferromagnetic materials; Coatings; Ferrites; Iron; Magnetic hysteresis; Magnetic properties; Plasma x-ray sources; Powders; X-ray diffraction; Exchange bias; MnZn ferrite; plasma-spray;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2004.829295
