FeCo/Cu and FeCo/Ru Laminated Structures by Electrodeposition

Huang, Qiang; Bonhote, C.; Lam, J.; Romankiw, L. T.

doi:10.1149/1.2753249

Cited by 5 publications

(3 citation statements)

References 12 publications

(14 reference statements)

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“…Whereas there is an abundant literature [8] on the GMR of electrodeposited (ED) Co/Cu, Ni/Cu, Ni-Co/Cu multilayers, reports on the GMR of ED multilayers with Fe in the magnetic layers are much less frequent. Specifically, there have been only two studies on the GMR of ED Fe-Co/Cu multilayers [9,10] and two more papers have only been found for ED Fe-Co/Cu multilayers [11,12]. However, in none of these works the electrochemically optimized Cu-deposition potential was used, which is crucial to eliminate both the codeposition of the magnetic material with Cu and the dissolution of the previously deposited magnetic atoms during the Cu deposition pulse.…”

Section: Introductionmentioning

confidence: 99%

Preparation, Structure and Giant Magnetoresistance of Electrodeposited Fe-Co/Cu Multilayers

Tóth

Péter

Pogány

et al. 2014

J. Electrochem. Soc.

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No systematic studies have been carried out on the giant magnetoresistance (GMR) of electrodeposited (ED) Fe-Co/Cu multilayers since the elaboration of a method for the optimization of the Cu layer deposition potential. In this paper, we present results on the electrochemical optimization of the Cu layer deposition potential which was found to depend on the relative iron concentration in the bath. An X-ray diffraction study of ED Fe 5 Co 95 (1.5 nm)/Cu(d Cu ) multilayers with d Cu ranging from 0.8 nm to 10 nm revealed an fcc structure. For most of the multilayers, weak superlattice satellite reflections could be identified. The room-temperature magnetoresistance was studied in detail as a function of the individual layer thicknesses. Multilayers with Cu layer thicknesses above about 1.5 nm were found to exhibit a GMR behavior with a maximum GMR of about 5% and a typical saturation field of 1 kOe. The GMR magnitude decreased with increasing Fe-content in the magnetic layer. The spacer layer thickness evolution of the MR data was established in detail after separating the ferromagnetic and superparamagnetic GMR contributions and no oscillatory GMR was found. A comparison with literature data on both physically deposited and ED Fe-Co/Cu multilayers is also made. Since bulk Fe-Co alloys have good soft magnetic properties, 1 multilayers with this kind of alloy as the magnetic layer can have favorably low coercivity. A detailed giant magnetoresistance study (GMR) study of sputtered TM/Cu multilayers by using binary and ternary alloys of Fe, Co and Ni as magnetic layers has been carried out by Miyazaki et al.2 who also mapped out the anisotropic magnetoresistance (AMR) of bulk alloys of the Fe-Co-Ni system. As to the GMR of physically deposited Fe-Co/Cu multilayers, it was shown that they can, indeed, have a significant room-temperature GMR (Refs. 2 and 3) with fairly low saturation fields. 3Inomata and Saito 3 investigated sputtered Fe-Co/Cu multilayers with Fe-concentrations of 10, 20 and 50%. In their study, the Cu layer thickness was varied between 0.9 and 3.8 nm and three oscillatory GMR peaks were found as a function of the spacer layer thickness. Rafaja et al. 4 found about 25% GMR on sputtered [Fe 10 Co 90 (1.1 nm)/Cu(2.2 nm)]x20 multilayers but a detailed study on the influence of the individual layer thicknesses was not carried out. Gangopadhyay et al.5 also studied sputtered Fe 10 Co 90 /Cu multilayers. The Cu layer thickness was varied between 0.5 and 3.1 nm and an oscillatory GMR was found, but contrary to the typical result on sputtered multilayers, the second peak was found to be the larger.There are contradictory experimental data in the literature on physically deposited FM/Cu multilayers, whether a pure Co magnetic layer or a Fe-Co alloy shows larger GMR value. Kataoka et al. 6 and Inomata and Saito 3 present data according to which for [Fe 20 Co 80 (1.0 nm)/Cu(1.0 nm)]x15 multilayers the GMR is higher than for multilayers with pure Co as magnetic layer, while the work of Miyazaki et al. 7 shows that...

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Section: Introductionmentioning

confidence: 99%

Preparation, Structure and Giant Magnetoresistance of Electrodeposited Fe-Co/Cu Multilayers

Tóth

Péter

Pogány

et al. 2014

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…Therefore, the coupling between adjacent layers has to be lower to obtain GMR in the lower magnetic field such as multilayers and spin valves. For the CoFe/Cu multilayers produced by the electrodeposition, there are some reports on the dependence of their GMR and its sensitivity on ferromagnetic or non-magnetic layers thicknesses [8,[14][15][16][17][18][19][20][21]. Non-magnetic layer dependence of deposition potential were studied by Toth et al [8].…”

Section: Introductionmentioning

confidence: 99%

“…da Silva et al [14] and Kakuno et al [16] studied on the heterogeneous (Co 0.87 Fe 0.13 ) x /Cu 1 À x granular alloys from a single sulphate solution under potentiostatic conditions. Huang et al was investigated the laminated structures FeCo/Cu and FeCo/ Ru prepared by two-bath plating, one-bath plating and platingsputtering hybrid method [17]. Our previous study [18] was about the effect of the Fe concentration in electrolyte on CoFe/Cu multilayers.…”

Section: Introductionmentioning

confidence: 99%