Effects of sintering temperature on the magnetoresistance and microstructure of the mixture of Fe3O4 and Cu-ferrite powder
Journal
Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International
Journal Volume
41
Journal Issue
10
Pages
2757-2759
Date Issued
2005-04
Date
2005-04
Author(s)
DOI
N/A
Abstract
The Fe3O4 powder was mixed with Cu-ferrite powder then sintered in an argon atmosphere at temperatures between 1000°C and 1250°C for 4 h. The Cu-ferrite content in the mixture powder was between 0 mol% and 30 mol%. The effects of Cu-ferrite content and sintering temperature on the magnetoresistance (MR) and microstructure of the sintered ferrite were investigated. It was found that the Cu ions were dispersed uniformly in all sintered samples by the analysis of Cu element mapping of the scanning electron microscopy. The maximum MR ratio of the sintered ferrite at room temperature is about 7.3% when Cu-ferrite content was 7.28 mol% and sintering temperature was 1200°C. From the plot of log ρ versus T-1/2 curves and the measurement of the current versus voltage curves of the sintered samples, it can be known that the magnetoresistance mechanisms in these sintered samples are the contribution of spin-polarized tunneling effect. © 2005 IEEE.
Subjects
Cu-ferrite; Magnetoresistance (MR); Spin-dependent tunneling
Other Subjects
Dispersions; Ferrites; Magnetoresistance; Microstructure; Mixtures; Powder metals; Scanning electron microscopy; Sintering; Cu-ferrite; Sintered ferrite; Spin polarization; Spin-dependent tunneling; Iron compounds
Type
journal article
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