NDLI: Magnetoresistance and microstructure of the sintered Ni doped Fe/sub 3/O/sub 4/ ferrites

Content Provider	IEEE Xplore Digital Library
Author	Chou, C.Y. Kuo, P.C. Yao, Y.D. Sun, A.C. Chen, S.C. Chang, I.J. Chen, J.W.
Copyright Year	1965
Abstract	Sintered Ni doped Fe/sub 3/O/sub 4/ ferrites were prepared by mixing Fe/sub 3/O/sub 4/ powder with NiO powder and compressing into pellet, then sintering in argon atmosphere. The contents of Ni in the sintered samples were between 0 at.% and 5.08 at.%. The effects of the Ni content, sintering temperature and sintering time on the magnetoresistance (MR) and microstructure of sintered Fe/sub 3/O/sub 4/ ferrites were investigated. X-ray diffraction and chemical titration analysis of Fe/sup 2+/ and Fe/sup 3+/ ions indicate that the nonstoichiometric phases of Fe/sub 3/O/sub 4+X/ and NiFe/sub 2/O/sub 4-Y/ were co-existed in the Ni doped sample. The optimum sintering temperature, at which the maximum MR value could be obtained, is around 1100/spl deg/C and the optimum sintering time is about 9 h for all samples. After sintering at 1100/spl deg/C for 9 h, the MR value of the undoped Fe/sub 3/O/sub 4/ ferrite is about 6% at room temperature. Maximum MR value is about 7.5% when 1.12 at.% Ni was doped. It was found that the log /spl rho/ versus T/sup -1/2/ curves of all the samples exhibit a linear relationship from the measurement of the electrical resistivity (/spl rho/) of the sintered samples between 80 K and room temperature. This implies that the MR effect is mainly spin-dependent tunneling where the electrons flow through insulating barriers of Fe/sub 2/O/sub 3/, NiFe/sub 2/O/sub 4/ or NiFe/sub 2/O/sub 4-Y/.
Sponsorship	IEEE Magnetics Society
Starting Page	906
Ending Page	908
Page Count	3
File Size	484020
File Format	PDF
ISSN	00189464
Volume Number	41
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetoresistance Microstructure Iron Temperature Ferrites Powders Chemical analysis Argon Atmosphere X-ray diffraction spin-dependent tunneling Magnetoresistance (MR) sintered Fe
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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