NDLI: Evolution of structural and magnetic properties and the electronic structure of spinel Fe/sub x/Co/sub 3-x/O/sub 4/ thin films

Content Provider	IEEE Xplore Digital Library
Author	Kwang Joo Kim Hee Kyung Kim Young Ran Park Geun Young Ahn Chul Sung Kim Jae Yun Park
Copyright Year	1965
Abstract	Evolution of structural, optical, and magnetic properties has been investigated for sol-gel-grown spinel Fe/sub x/Co/sub 3-x/O/sub 4/ thin films as the Fe composition (x) increases from 0 to 2. The crystal structure of Fe/sub x/Co/sub 3-x/O/sub 4/ is found to remain cubic with the lattice constant increasing with increasing x. Coexistence of two phases is observed by X-ray diffraction for 0.76/spl les/x/spl les/0.93, interpreted as due to normal spinel, dominant for x/spl les/0.55, and inverse spinel, dominant for x/spl ges/1.22. Analysis on the measured optical absorption spectra by spectroscopic ellipsometry for the samples indicates the dominance of the normal spinel phase for low x in which Fe/sup 3+/ ions mostly substitute octahedral Co/sup 3+/ sites. X-ray photoelectron spectroscopy measurements revealed that both Fe/sup 2+/ and Fe/sup 3+/ ions exist with similar strength in the x=0.93 sample. Vibrating sample magnetometry measurements revealed that the Fe/sub x/Co/sub 3-x/O/sub 4/ films start exhibiting magnetic hysteresis behaviors for x/spl ges/0.76 with the saturation magnetization increasing with increasing x. Conversion electron Mo/spl uml/ssbauer spectra measured on the x=0.93 sample showed that Fe/sup 2+/ ions prefer the octahedral sites, indicating the formation of the inverse spinel phase. The remarkable change of the lattice constant for x/spl ges/0.76 is derivable from the site preference of the Fe/sup 2+/ and Fe/sup 3+/ ions.
Sponsorship	IEEE Magnetics Society
Starting Page	3478
Ending Page	3480
Page Count	3
File Size	165529
File Format	PDF
ISSN	00189464
Volume Number	41
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic properties Iron Optical films Optical saturation Magnetic films Lattices Phase measurement Spectroscopy Saturation magnetization X-ray diffraction spinel Crystal structure magnetic hysteresis MÖssbauer spectroscopy optical absorption
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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