Atomic structure and magnetic properties of Cu80Co20 nanocrystalline compound produced by mechanical alloying

Ivchenko, V. A.; Уймин, М. А.; Yermakov, A. Ye.; Korobeinikov, A.Yu.

doi:10.1016/s0039-6028(99)00821-3

Cited by 12 publications

(5 citation statements)

References 11 publications

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“…116 Thorough field-ion microscopy studies of the structure of the nanocomposite showed that the material contains both individual 15-nm Co nanoparticles and 1 ± 3-nm cluster inclusions of Co atoms in the copper matrix. 117 The presence of small Co clusters is responsible for anomalous magnetoresistance of the nanocomposite. Layered Co ± Cu structures obtained by vapour deposition or using pulse electrochemical deposition also possess analogous properties.…”

Section: Methods For Mechanochemical Synthesis Of Nanocomposites and ...mentioning

confidence: 99%

Size effects in chemistry of heterogeneous systems

2001

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Section: Methods For Mechanochemical Synthesis Of Nanocomposites and ...mentioning

confidence: 99%

Size effects in chemistry of heterogeneous systems

2001

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“…Therefore, the magnitude of magnetoresistance depends on microstructural factors such as magnetic to non-magnetic constituent ratio, size and shape of the particles, distance between particles as the most important one. [6][7][8][9] The giant magnetoresistant has been observed in nanostructured alloys, such as Co-Cu 10 and Fe-Cu 11 systems. Copper and cobalt are immiscible at room temperature.…”

Section: Introductionmentioning

confidence: 99%

“…A metastable Cu-Co solid solution can be readily produced by all those processes, which can be decomposed under annealing to produce nanosized materials. 8,[20][21][22][23][24] The effect of milling time and consolidation process on the cluster size and the electrical and magnetic properties of Cu 93 Co 7 and Cu 90 Co 10 alloys have been published in previous investigations. 25,26 As far as the authors know from their literature review, there are only few investigations about the effect of Ni on magnetic properties of copper alloys.…”

Section: Introductionmentioning

confidence: 99%

“…However, Cu–Co granular alloys can be obtained by non-equilibrium processing methods such as sputtering,10 melt-spinning,7,13 – 17 liquid separation18,19 and mechanical alloying. A metastable Cu–Co solid solution can be readily produced by all those processes, which can be decomposed under annealing to produce nanosized materials 8,20 –. 24…”

Section: Introductionmentioning

confidence: 99%

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Soft magnetic Cu–Co–Ni composite materials produced by mechanical alloying, cold compaction and sintering

et al. 2012

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Cu 90 Co 10 and Cu 85 Co 10 Ni 5 soft magnetic alloys were obtained by non-equilibrium phase synthesis. Elemental powder mixtures were mechanically alloyed in a planetary mill to disperse ultrafine Co and (Co,Ni) particles in the copper matrix. Thus, it was possible to modified magnetic properties of these materials. Resulting powders were characterised as a function of milling time by means of X-ray diffraction, SEM, high resolution transmission electron microscopy and electron probe microanalysis. The variation of magnetic properties and its dependence on the structure/ precipitation change with milling time for each alloy are discussed. Magnetic properties of Cu-Co and Cu-Co-Ni powders reached their optimum values after milling for 60 h. On the other hand, superparamagnetic behaviour was observed at 300 K in the Cu-Co-Ni alloys. Both alloys were consolidated after 60 h milling by cold compaction and sintering at 973 K for 1 h. Although this treatment is performed at high temperature, precipitation and coalescence of Co particles on the Ni 5 Co X Cu 952X system was retarded by the presence of Ni in solid solution in Cu matrix.

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“…Since giant magnetoresistance (GMR) has been found in the heterogeneous nanoscale structures of ferromagnetic (Co, Fe) and non-ferromagnetic (Cu, Cr, Ag) materials, many studies were focused on enhancing GMR properties by making an optimum microstructure. [1][2][3] The limited solubility of ferromagnetic element in a non-ferromagnetic material is one of the necessary conditions to obtain GMR characteristics. Considering the prerequisite of the solubility and magnetic nature of materials, the Cu-Co system is a representative alloy for GMR applications.…”

Section: Introductionmentioning

confidence: 99%

Direct observation of cobalt precipitates in nanocrystalline Cu–Co powder synthesised by laser ablation

Ahn¹,

Jung²,

Park³

et al. 2005

Powder Metallurgy

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Nanocrystalline Cu-Co (Cu-25Co by atomic fraction) powder for giant magnetoresistance (GMR) application has been synthesised by laser ablation method. The effect of Co precipitating evolution on the GMR properties during annealing has been investigated using energy filtered transmission electron microscopy (EFTEM) and X-ray diffraction. The as synthesised Cu-Co powder was 10 nm in diameter and formed a solid solution with an fcc structure. On the thermal stability during annealing the Cu-Co powder, the grain growth commenced before the phase separation of Cu and Co. As the result of the phase separation, nanocrystalline fcc Co particles with an average diameter of 5 nm were uniformly dispersed in Cu matrix. The relationship between the GMR property and the microstructural evolution of Co precipitate could be understood by the compositional profile showing a sinusoidal shape from EFTEM images.PM/1181

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Atomic structure and magnetic properties of Cu80Co20 nanocrystalline compound produced by mechanical alloying

Cited by 12 publications

References 11 publications

Size effects in chemistry of heterogeneous systems

Size effects in chemistry of heterogeneous systems

Soft magnetic Cu–Co–Ni composite materials produced by mechanical alloying, cold compaction and sintering

Direct observation of cobalt precipitates in nanocrystalline Cu–Co powder synthesised by laser ablation

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