Temperature dependence of the magnetic and transport properties of Co15Cu85 magnetic granular alloys

Abstract

Microstructural evolution and giant magnetoresistance in melt spun and annealed Cu 85 (FeCo) 15 alloyThe temperature dependence of magnetic and transport properties of annealed Co 15 Cu 85 alloys has been studied from 2 to 300 K. It was found that the magnetic property and resistivity significantly change with the temperature. Based on the two-current resistance model, we have calculated the electron spin-mixing parameter Q(T), which explains the magnetoresistance change with the temperature for granular Co 15 Cu 85 alloys.

A phenomenological theory of the granular size effect on the giant magnetoresistance of granular films

“…2(a) shows the dependence of GMR on measuring temperature for superparamagnetic granules as the key role in GMR effect. There exists a peak value of GMR at a certain measuring temperature, which is not apparently in agreement with experiments [25,26]. In Fig.…”

Kondo-like effect in magnetoresistive CuCo alloys

“…1 and 2 and the corresponding parameters values are listed in Table I. The values obtained for 0 are in good agreement with those found by Yu et al 21 ͑ϳ10-30 ⍀ cm͒ in similar CuCo alloys. The values for the coefficient a are in the range ͑1.6Ϯ 0.3͒ ϫ 10 −4 ͑⍀ cm K −2 ͒.…”

Effect of magnetic impurities on electronic transport of heterogeneous ferromagnets

“…1͒ of four simultaneously deposited Co 18 ϪAg 82 samples ͑volume concentration of Co is 18% and Ag is 82%͒ that passed different post-deposition thermal treatment. Sample ͑1͒ was left asdeposited, sample ͑2͒ was annealed at 200°C for 30 min, sample ͑3͒ was annealed at 300°C for 30 min and sample ͑4͒ was annealed at 300°C for 180 min.…”

“…At low temperatures however, the magnetoresistance was found to change even stronger than at high temperatures, contrary to the saturation observed in multilayers. 10,[14][15][16][17][18][19] In addition, the resistance R(H), measured in high magnetic fields H, and the magnetoresistance ͑MR͒ change at low temperatures almost linearly with temperature, while the zero-field resistance R(0) saturates ͑up to a shallow minimum, which we will not discuss in this paper͒ in the low-temperature limit. It was argued first in Ref.…”