ISSN:
1432-0630
Keywords:
75.30.−m
;
75.30.Cr
;
75.30.Kj
;
75.70.−i
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract Magnetic properties of rf sputtered (0.5−x) Bi2O3-x CaO-0.5 Fe2O3 (x=0−0.5) have been studied through magnetization and ferromagnetic resonance (FMR) measurements. Films prepared in a mixed oxygen-argon atmosphere are amorphous and paramagnetic. Samples annealed in air at temperatures of 700–1000 K show a ferrimagnetic behavior even though X-ray diffraction data for the films do not indicate the precipitation of any crystalline ferrimagnetic compounds. The room-temperature saturation magnetization 4πM and the uniaxial anisotropy field H u , decrease with increasing x. The Curie temperature and the gyromagnetic ratio γ increase with increase in the concentration of CaO. Studies on the effects of sputtering atmospheres on magnetic parameters show that films sputtered in oxygen-rich atmospheres have a large 4πM and H u , and a relatively small γ and FMR line-width. Ordered amorphous clusters are suggested to give rise to the observed ferrimagnetic character in the annealed films.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00331672
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