Structural properties of electrodeposited Co/Cu multilayers

Fanity, H. El; Rahmouni, K.; Bouanani, M. El; Dinia, A.; Shmerber, G.; Mény, C.; Panissod, P.; Cziráki, Á.; Cherkaoui, F.; Berrada, A.

doi:10.1016/s0040-6090(97)01181-4

Cited by 28 publications

(23 citation statements)

References 10 publications

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“…By looking at former reports, [5][6][7][8][9][10][11][12][13][14][15] it can be established that in most cases not completely systematic studies on layer thicknesses have been carried out for ED Co/Cu multilayers from the sulfate bath. For example, there were several studies of the GMR dependence on layer thicknesses, where one of the layer thicknesses was fixed and the other layer thickness was only varied.…”

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confidence: 99%

Giant Magnetoresistance and Structure of Electrodeposited Co/Cu Multilayers: The Influence of Layer Thicknesses and Cu Deposition Potential

Rajasekaran

Mani

Tóth

et al. 2015

J. Electrochem. Soc.

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The giant magnetoresistance (GMR) and structure was investigated for electrodeposited Co/Cu multilayers prepared by a conventional galvanostatic/potentiostatic pulse combination from a pure sulfate electrolyte with various layer thicknesses, total multilayer thickness and Cu deposition potential. X-ray diffraction (XRD) measurements revealed superlattice satellite reflections for many of the multilayers having sufficiently large thickness (at least 2 nm) of both constituent layers. The bilayer repeats derived from the positions of the visible superlattice reflections were typically 10 -20% higher than the nominal values. The observed GMR was found to be dominated by the multilayer-like ferromagnetic (FM) contribution even for multilayers without visible superlattice satellites. There was always also a modest superparamagnetic (SPM) contribution to the GMR and this term was the largest for multilayers with very thin (0.5 nm) magnetic layers containing apparently a small amount of magnetically decoupled SPM regions. No oscillatory GMR behavior with spacer thickness was observed at any magnetic layer thickness. The saturation of the coercivity as measured by the peak position of the MR(H) curves indicated a complete decoupling of magnetic layers for large spacer thicknesses. The GMR increased with total multilayer thickness which could be ascribed to an increasing SPM contribution to the GMR due to an increasing surface roughness, also indicated by the increasing coercivity. For multilayers with Cu layers deposited at more and more positive potentials, the GMR FM term increased and the GMR SPM term decreased. At the same time, a corresponding reduction of surface roughness measured with atomic force microscopy indicated an improvement of the multilayer structural quality which was, however, not accompanied by an increase of the superlattice reflection intensities. The present results underline that whereas the structural quality as characterized by the surface roughness generally correlates fairly well with the magnitude of the GMR, the microstructural features determining the amplitude of superlattice reflections apparently do not have a direct influence on the GMR. Due to the large giant magnetoresistance (GMR) effect observed in physically deposited Co/Cu multilayers, 1-3 a lot of efforts have been devoted to the study of GMR also on electrodeposited (ED) Co/Cu multilayers (for detailed references, see a recent review).4 A variety of baths have been used for the preparation of ED Co/Cu multilayers, 4 the simplest one containing merely CoSO 4 and CuSO 4 . Over the last two decades, numerous reports have been published on studying the GMR characteristics of ED Co/Cu multilayers from the pure sulfate bath (containing at most some buffering agents). [5][6][7][8][9][10][11][12][13][14][15] In this list of references, we have included only those works from the much larger number of reports 4 in which the ED Co/Cu multilayers were prepared from the sulfate bath at or close to the electrochemically optimized Cu depositi...

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confidence: 99%

Giant Magnetoresistance and Structure of Electrodeposited Co/Cu Multilayers: The Influence of Layer Thicknesses and Cu Deposition Potential

Rajasekaran

Mani

Tóth

et al. 2015

J. Electrochem. Soc.

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“…This electrode was introduced into the cell, filled with a deaerated solution [28,31,33]. The electrolyte composition was chosen in order to control hydrogen evolution during the cyclic voltammetry: too low pH electrolyte would lead to hydrogen evolution before metal deposition [34].…”

Section: Determination Of Potentials Reduction and Oxidation Of The Cmentioning

confidence: 99%

“…The literature mentioned that pH around 4 was the best for Co electrodeposition onto metal substrate [31,35]. To maintain this pH value, boric acid was frequently used as a buffer agent [28,31,33,35,36].…”

Section: Determination Of Potentials Reduction and Oxidation Of The Cmentioning

confidence: 99%

A Cobalt Film Electrode for Nitrite Determination in Natural Water

2007

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In this study a cobalt film electrodeposited on a copper disk (˘¼ 3.1 mm) was tested as electrode to measure nitrite ions in raw water. This electrode was able to determine the nitrite ions concentration in nondeaerated synthetic media and in natural water. The electrode reached a detection limit of 0. , HCO 3 À and NH 4 þ was also tested. The electrode was used to determine the concentration of nitrite ions in a real sample.

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“…r Electrochemical deposition technique for multilayer in which the magnetic layer is a binary alloy has not been extensively used even if certain properties offered by this technique can be comparable to those of others techniques [1]. It has been previously shown that the magnetoresistance of electrodeposited Co/Cu multilayers is comparable to the sputtered and MBE grown Co/Cu samples and a small antiferromagnetic coupling between magnetic layers give rise to a relatively high magnetoresistance [2].The aim of this work was to produce electrodeposited (Co x Zn 1Àx /Cu) n multilayers not studied until now and to investigate the structural, the magnetic and the transport properties.The (Co x Zn 1Àx /Cu) multilayers have been grown using the electrodeposition technique by the dual bath. The magnetic Co x Zn 1Àx layer was deposited in the electrolyte bath containing CoCl 2 Á 6H 2 O; CoSO 4 Á 7H2O; ZnSO 4 Á 7H 2 O; (NH 4 ) 2 SO 4 and H 3 BO 3 .…”

mentioning

confidence: 99%

mentioning

confidence: 99%