Synthesis, characterization and magnetic properties of Co Cu1− (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si0020.gif" overflow="scroll"><mml:mi>x</mml:mi><mml:mo>∼</mml:mo><mml:mn>0.01</mml:mn><mml:mo>–</mml:mo><mml:mn>0.3</mml:mn></mml:math>) granular alloys

Dhara, S.; Chowdhury, Rajeswari Roy; Lahiri, Susanta; Ray, Pulak; Bandyopadhyay, Bilwadal

doi:10.1016/j.jmmm.2014.09.030

Cited by 10 publications

(3 citation statements)

References 46 publications

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“…17 On the other hand, for a Co concentration of 30% and an average particle diameter of 18 nm, a blocking temperature of above 30 K is reported in nano-granular Co/Cu alloys. 18 Since about 50% of the Co and all of the Cu in the (Co/Cu):ZnO sample are present in its metallic form, the findings are consistent with nanoprecipitates of 30%-40% of Co and 70%-60% of Cu with an estimated average diameter of only 3 nm to account for the very low blocking temperature of only 5 K in comparison to Ref. 18.…”

Section: B Co/cu Vs Co Metallic Nanoprecipitates In Znomentioning

confidence: 53%

“…It is wellknown that Co and Cu are immiscible in the bulk, 16 but Co/ Cu can be stabilized by off-equilibrium techniques like sputtering 17 or as a nano-granular alloy. 18 In our Co/Cu co-doped ZnO samples, very small and magnetically soft Co/Cu nanoprecipitates are found which lead to a strong superparamagnetic response with low blocking temperatures of about 5 K. metallic composite targets at low (20 W) sputtering power. The base pressure of the preparation system was 1 Â 10 À9 mbar, while the working pressure during film deposition was 4 Â 10 À3 mbar.…”

Section: Introductionmentioning

confidence: 75%

“…18 Since about 50% of the Co and all of the Cu in the (Co/Cu):ZnO sample are present in its metallic form, the findings are consistent with nanoprecipitates of 30%-40% of Co and 70%-60% of Cu with an estimated average diameter of only 3 nm to account for the very low blocking temperature of only 5 K in comparison to Ref. 18. The average size of the resulting nano-precipitates for Co:ZnO and (Co/Cu):ZnO is thus of the same order (3 nm) which for Co:ZnO is in agreement with the findings for in Refs.…”

Section: B Co/cu Vs Co Metallic Nanoprecipitates In Znomentioning

confidence: 99%

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Co and Cu co-doped ZnO epitaxial films—A magnetically soft nano-composite

Ney

Venkataraman

Henne

et al. 2016

Journal of Applied Physics

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A series of Co/Cu co-doped ZnO epitaxial films has been grown on sapphire substrates to investigate the possibilities of tailoring the magnetic properties in functional ZnO-Co/Cu nano-composites. The growth was performed using reactive magnetron sputtering varying the oxygen partial pressure to tune the incorporation of the dopants and the resulting valence state. At high oxygen pressures, Co2+ is formed and the resulting magnetic properties are very similar to phase pure paramagnetic Co-doped ZnO samples. However, the formation of a secondary CuO phase reduces the overall structural quality of the layers and virtually no substitutional incorporation of Cu2+ in ZnO could be evidenced. At low oxygen pressures, a significant fraction of metallic Co and Cu forming nanometer-sized superparamagnetic precipitates of a Co/Cu alloy can be evidenced which are embedded in a ZnO host matrix.

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Section: B Co/cu Vs Co Metallic Nanoprecipitates In Znomentioning

confidence: 53%

Section: Introductionmentioning

confidence: 75%

Section: B Co/cu Vs Co Metallic Nanoprecipitates In Znomentioning

confidence: 99%

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Co and Cu co-doped ZnO epitaxial films—A magnetically soft nano-composite

Ney

Venkataraman

Henne

et al. 2016

Journal of Applied Physics

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Electrochemical preparation and magnetic properties of Co–Cu nanometric granular alloy films

et al. 2019

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A detailed electrodeposition of Co-Cu nanometric granular alloy films in citrate solution has been performed based on a galvanostatic technique. Electrochemical behaviour of the bath solution containing both Co 2+ and Cu 2+ was investigated by linear sweep voltammetry. Cathodic polarization curves indicated that high quality Co-Cu nanometric granular alloy films can be obtained at room temperature with a pH of 6 and current density equal to or more negative than − 1.0 mA cm −2. Magnetic properties of the films were measured at room temperature by the physical property measurement system. Magnetization curves of the as-prepared Co-Cu nanometric granular alloy films displayed superparamagnetism (SPM). However, after annealing at 450 • C for 1 h, magnetic property of the films changed from SPM to ferromagnetism. Meanwhile, the annealed Co-Cu nanometric granular alloy films showed an increase in saturation magnetization with the increase of the current density.

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