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Giant Positive Magnetoresistance in Grain-Oriented CxCo1-x Alloys |
ZHANG Dong-Jie |
Laboratory of Materials Science, Nanjing Normal University,
Nanjing 210097 |
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Cite this article: |
ZHANG Dong-Jie 2003 Chin. Phys. Lett. 20 1852-1854 |
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Abstract The grain-oriented CxCo1-x (x = 0.9, 0.5) samples were fabricated by the hot-pressing method. The microstrucre was observed by an x-ray diffractometer and a scanning electron microscope. The resistance against the applied magnetic field was measured by a standard four-point probe method at different temperatures. The magnetoresistance and the magnetization ratio were studied as a function of magnetic field in the range of -1800 kA/m-1800 kA/m at different temperatures from 50 K to 300 K. The magnetoresistance of grain-oriented CxCo1-x is positive. The maximum positive MR of 98% at 50 K and 34% at 300 K was obtained under 1800 kA/m magnetic field in the C0.9Co0.1 sample.
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Keywords:
75.10.-b
75.30.Vn
75.70.Pa
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Published: 01 October 2003
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