Giant Positive Magnetoresistance in Grain-Oriented C<suB>x</suB>Co<suB>1-x</suB> Alloys

Chin. Phys. Lett.

2003, Vol. 20

Issue (10): 1852-1854 DOI:

Original Articles

Giant Positive Magnetoresistance in Grain-Oriented C_xCo_1-x Alloys

ZHANG Dong-Jie

Laboratory of Materials Science, Nanjing Normal University, Nanjing 210097

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ZHANG Dong-Jie 2003 Chin. Phys. Lett. 20 1852-1854

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Abstract The grain-oriented C_xCo_1-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 C_xCo_1-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 C_0.9Co_0.1 sample.

Keywords: 75.10.-b 75.30.Vn 75.70.Pa

Published: 01 October 2003

PACS:	75.10.-b	(General theory and models of magnetic ordering)
	75.30.Vn
	75.70.Pa

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y2003/V20/I10/01852

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