Title :
Magnetic properties of K2O-Fe2O3-Bi2O3 films fabricated by sol-gel processing
Author :
Yamaguchi, K. ; Matsumoto, K. ; Fujii, T.
Author_Institution :
Dept. of Electr. & Electron. Eng., Toyohashi Univ. of Technol., Japan
fDate :
9/1/1992 12:00:00 AM
Abstract :
The magnetic properties of K2O-Fe2O3 -Bi2O3 films synthesized by using the sol-gel reaction of a solution of iron (111) nitrate dissolved in ethylene glycol were investigated. The films were formed on glass plates by spin coating a gel solution of potassium nitrate and bismuth nitrate added to the solution above, drying, and then annealing in air at various temperatures. The films annealed below 500°C show paramagnetic behavior at room temperature. On the other hand, in certain compositions of this ternary oxide system, films annealed above 500°C have spontaneous magnetization. The maximum value of magnetization at a field of 15 kOe was 4πM=1.8 kG, for the composition 8.3K2O-73.4 Fe2O3-18.3Bi 2O3, where the magnetization was still not completely saturated. The X-ray diffraction pattern of this film shows diffraction lines assigned to antiferromagnetic BiFeO3, but no ferromagnetic crystallines were detected
Keywords :
annealing; bismuth compounds; coercive force; ferrites; magnetic thin films; magnetisation; paramagnetic properties of substances; potassium compounds; sol-gel processing; 500 to 800 C; K2O-Fe2O3-Bi2O3 films; X-ray diffraction pattern; annealed; antiferromagnetic BiFeO3; coercivity; ferromagnetism origin; glass plates; magnetic properties; magnetic thin films; paramagnetic behavior; sol-gel processing; spin coating; spontaneous magnetization; Annealing; Anti-freeze; Coatings; Glass; Iron; Magnetic films; Magnetic properties; Magnetization; Temperature; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
