Magnetoresistance and Structural State of Cu-Co, Cu-Fe Compounds Obtained by Mechanical Alloying

Yermakov, A. Ye.; Уймин, М. А.; Shangurov, A. V.; Zarubin, A. V.; Chechetkin, Yu. V.; Shtolz, A.K.; Kondratyev, V.V.; Коныгин, Г. Н.; Yelsukov, Ye.P.; Enzo, Stefano; Macrí, P.P.; Frattini, Romana; Cowlam, N.

doi:10.4028/www.scientific.net/msf.225-227.147

Cited by 11 publications

(6 citation statements)

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“…Recently a great deal of attention has been focused on GMR in the Co-Cu system. In the literature, nanoscaled granular Co-Cu system alloys prepared by the sputtering method, [5][6][7] repeated rolling method, 8 melt-spinning, 9,10 and MA [11][12][13][14][15] have been found to exhibit GMR effects, by annealing at an opportune temperature. On the other hand, magnetoresistance ͑MR͒ measurement of the Co-Cu system solid solution has not been reported yet.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of Co-Cu metastable solid solution alloys

et al. 2004

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Metastable solid solution alloy powders and bulk alloys in the cobalt͑Co͒-copper͑Cu͒ ͑10-90 mol % Co͒ system, which is an almost immiscible system at the ambient state, were prepared by mechanical alloying ͑MA͒ and shock compression. All MA-treated powders showed the x-ray diffraction patterns of a single phase of fcc structure. The lattice parameter increases with Cu concentration and is fundamentally on the line with Vegard's law. The magnetization curves of Co x Cu 100Ϫx (xϭ20-80) metastable bulk alloys at room temperature showed ferromagnetism, while the one of Co 10 Cu 90 system showed paramagnetism. The saturation magnetic moment (M s ) curve versus electron numbers per atom at 0 K was found to be similar to the Slater-Pauling curves of other transition-metal binary systems and decreased with increasing Cu concentration and approached zero at about 28.8 electrons per atom. The magnetoresistance ratio at room temperature increased with Cu content in the ferromagnetic region, while the one of the paramagnetic Co 10 Cu 90 alloy was negligibly small.

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Section: Introductionmentioning

confidence: 99%

Magnetic properties of Co-Cu metastable solid solution alloys

et al. 2004

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“…Regarding the investigation of different magnetic properties of materials deformed by HPT, numerous studies focusing on the magnetic properties of HPT-processed materials are available [33][34][35][36][37][38][39][40][41][42]. Other techniques to apply severe deformation onto materials include ball milling, mechanical alloying, and equal channel angular pressing (ECAP), with some studies focusing on the magnetic properties of these alternative processing routes [18][19][20][21]26,43,44]. However, to the best knowledge of the authors, there are only two studies on HPT-deformed materials, which also contain information on magneto-resistive properties [34,37].…”

Section: Introductionmentioning

confidence: 99%

“…They were produced using a variety of different techniques, such as magnetron sputtering [3,4,[7][8][9][10][11], molecular beam epitaxy [5], ion beam co-sputtering [12], cluster beam deposition [13], thermal evaporation [14], or by electrochemical deposition [15][16][17]. Later, research was extended to bulk materials and mixed granular materials were produced using different techniques such as mechanical alloying/ball milling [18][19][20][21][22] or melt spinning [9,[23][24][25]. Research focused on a small number of binary, sometimes ternary systems such as CuCo [3][4][5]9,14,16,17,19,21,23,25,26], AgCo [4,6,7,9,11,12,18], CuFe [13,19], CoFe-Cu [10,20,22], CrFe…”

Section: Introductionmentioning

confidence: 99%

“…Later, research was extended to bulk materials and mixed granular materials were produced using different techniques such as mechanical alloying/ball milling [18][19][20][21][22] or melt spinning [9,[23][24][25]. Research focused on a small number of binary, sometimes ternary systems such as CuCo [3][4][5]9,14,16,17,19,21,23,25,26], AgCo [4,6,7,9,11,12,18], CuFe [13,19], CoFe-Cu [10,20,22], CrFe [8], and AuCo [9,24]. A common feature of these systems is the small mutual solubility of ferromagnetic and non-magnetic elements, as well as the nonmagnetic phase representing the major phase.…”

Section: Introductionmentioning

confidence: 99%

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Tuneable Magneto-Resistance by Severe Plastic Deformation

Wurster

Weissitsch

Stückler

et al. 2019

Metals

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Bulk metallic samples were synthesized from different binary powder mixtures consisting of elemental Cu, Co, and Fe using severe plastic deformation. Small particles of the ferromagnetic phase originate in the conductive Cu phase, either by incomplete dissolution or by segregation phenomena during the deformation process. These small particles are known to give rise to granular giant magneto-resistance. Taking advantage of the simple production process, it is possible to perform a systematic study on the influence of processing parameters and material compositions on the magneto-resistance. Furthermore, it is feasible to tune the magneto-resistive behavior as a function of the specimens’ chemical composition. It was found that specimens of low ferromagnetic content show an almost isotropic drop in resistance in a magnetic field. With increasing ferromagnetic content, percolating ferromagnetic phases cause an anisotropy of the magneto-resistance. By changing the parameters of the high pressure torsion process, i.e., sample size, deformation temperature, and strain rate, it is possible to tailor the magnitude of giant magneto-resistance. A decrease in room temperature resistivity of ~3.5% was found for a bulk specimen containing an approximately equiatomic fraction of Co and Cu.

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“…structure of the localized magnetic moments mainly at a surface layer of particles [8,9]. Many techniques for the preparation of nano magnetic granular alloys have been adopted, such as melt-quenching, evaporation, sputtering and mechanical alloying [10].…”

Section: Introductionmentioning

confidence: 99%