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Giant Magnetoresistance and Magnetic Properties of CoFe/Cu Multilayer Films: Dependence of Electrolyte pH

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Abstract

The effect of NaOH with different concentrations on CoFe/Cu multilayer films was studied between pH=3.70 and pH=2.70. The effect of different electrolyte pH from 3.7 to 2.7, which was obtained at various NaOH concentrations, on CoFe/Cu multilayer films was studied. The structural studies by x-ray diffraction (XRD) revealed that the multilayers have face-centered cubic structure. The preferential orientation of the multilayer is in the (220), (111), (111), and (222) direction at pH=3.7,3.3,3.0 and 2.7, respectively. It was observed that at pH=3.0, the film composition, by energy dispersive x-ray spectroscopy (EDX), contains 3.22 at. Co % and 96.78 at. Cu %, and at low pH (2.7), 10.58 at. Co %, 4.18 at. Fe % and 85.24 at. Cu %. Magnetoresistance measurements made at room temperature showed that all films exhibited giant magnetoresistance (GMR), which was affected by the electrolyte pH. The observed GMR values are 4.0 %, 4.6 %, 4.2 %, and 12 % at the pH values of 3.7, 3.3, 3.0 and 2.7, respectively. Magnetic measurements of the films were made at ±20 kOe by using ADE EV 9 model a vibrating sample magnetometer. The magnetic measurements revealed that the coercivity of the films increased from 70 Oe to 93 Oe and stayed there, and the saturation magnetization monotonically increased form 7.40 emu/g to 17.05 emu/g with decreasing electrolyte pH from 3.7 to 2.7.

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Acknowledgements

This paper was financially supported by Balikesir University under Grant No. BAP 2010/34, under Grant No. BAP 2001/02 for MR system, by Uludag University under Grant No. UAP(F)-2010/56 for the electrodeposition system, and by State Planning Organization, Turkey under Grant No. 2005K120170 for VSM system. The authors are grateful to Dr. H. Guler for XRD measurement, Balikesir University, Turkey. Thanks also go to Bilkent University, Turkey—UNAM for EDX measurements and SEM micrographs.

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Authors and Affiliations

  1. Department of Physics, Science and Literature Faculty, Balikesir University, 10145, Balikesir, Turkey

    T. Sahin & H. Kockar

  2. Department of Physics, Science and Literature Faculty, Uludag University, 16059, Gorukle, Bursa, Turkey

    M. Alper

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  1. T. Sahin
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  2. H. Kockar
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Correspondence to T. Sahin.

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Sahin, T., Kockar, H. & Alper, M. Giant Magnetoresistance and Magnetic Properties of CoFe/Cu Multilayer Films: Dependence of Electrolyte pH. J Supercond Nov Magn 26, 825–829 (2013). https://doi.org/10.1007/s10948-012-1848-y

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  • DOI: https://doi.org/10.1007/s10948-012-1848-y

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