|Title:||Effects of Sintering Temperature on the Magnetoresistance and Microstructure of the Mixture of Fe3O4 and Cu–Ferrite Powder||Authors:||Chou, C.Y.
|Keywords:||Cu–ferrite;magnetoresistance (MR);spin-dependent tunneling.||Issue Date:||Oct-2005||Publisher:||Taipei:National Taiwan University Dept Chem Engn||Journal Volume:||VOL. 41||Journal Issue:||NO. 10||Start page/Pages:||-||Source:||IEEE TRANSACTIONS ON MAGNETICS||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 maximumMRratio 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 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
|Appears in Collections:||材料科學與工程學系|
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