TY - JOUR
T1 - Magnetotransport and magnetic properties of mechanically alloyed Cox Cu100-x
AU - Ueda, Yuji
AU - Ikeda, Shoji
AU - Chikazawa, Susumu
PY - 1996/6
Y1 - 1996/6
N2 - Co-Cu binary alloys, whose Co concentrations range from 10 to 30 at.%, are produced by mechanical alloying. The structure, magnetoresistance (MR), and magnetism have been investigated for the as-milled and annealed alloys. After milling for 50 h, a supersaturated solid solution of fcc-CoCu is formed at Co concentrations of 10 to 30 at.%. The CoxCu100-x (x = 10-30) alloys annealed at 700°C for 1h separate into two phases of fcc-Co and fcc-Cu. The maximum MR ratio, under 15 kOe at room temperature, is 6.4% for the sample with x = 20 annealed at 450°C for 1h. The samples annealed at temperatures less than 450°C exhibit high MR ratio at x = 25. The magnetism of the sample with x = 20, which shows a maximum MR ratio, exhibits superparamagnetic behavior, but a slight ferromagnetic behavior have also been observed. Co-Cu alloys produced by mechanical alloying have a wide distribution of Co particle size with blocking temperature from low temperature to room temperature.
AB - Co-Cu binary alloys, whose Co concentrations range from 10 to 30 at.%, are produced by mechanical alloying. The structure, magnetoresistance (MR), and magnetism have been investigated for the as-milled and annealed alloys. After milling for 50 h, a supersaturated solid solution of fcc-CoCu is formed at Co concentrations of 10 to 30 at.%. The CoxCu100-x (x = 10-30) alloys annealed at 700°C for 1h separate into two phases of fcc-Co and fcc-Cu. The maximum MR ratio, under 15 kOe at room temperature, is 6.4% for the sample with x = 20 annealed at 450°C for 1h. The samples annealed at temperatures less than 450°C exhibit high MR ratio at x = 25. The magnetism of the sample with x = 20, which shows a maximum MR ratio, exhibits superparamagnetic behavior, but a slight ferromagnetic behavior have also been observed. Co-Cu alloys produced by mechanical alloying have a wide distribution of Co particle size with blocking temperature from low temperature to room temperature.
KW - Blocking temperature
KW - Co-Cu alloy
KW - Magnetoresistance
KW - Mechanical alloying
KW - Superparamagnetism
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U2 - 10.1143/jjap.35.3414
DO - 10.1143/jjap.35.3414
M3 - Article
AN - SCOPUS:0030172596
VL - 35
SP - 3414
EP - 3418
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
SN - 0021-4922
IS - 6 SUPPL. A
ER -