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Effect of nitrogen addition on morphology and magnetic properties of electrodeposited Co-Ni granular films

C. SÎRBU1,* , V. GEORGESCU1

Affiliation

  1. Faculty of Physics, “Alexandru Ioan Cuza” University, Iasi, 700506, Romania

Abstract

The granular films of magnetic alloys consisting of nanoscale ferromagnetic particles which exhibit a giant magnetoresistance (GMR) effect have been a subject of great interest in recent years. In this work, we report on experimental investigation of the influence of nitrogen addition on magnetic and transport properties of Co–Ni granular films with different nitrogen content, and on the surface morphology. The correlation between these properties and the electrodeposition conditions has been studied. The granular thin films were electrodeposited onto a disk-shaped aluminium substrate, from a basic bath containing: CoSO4.7 H2O, NiSO4.7 H2O, and NiCl2.6H2O with 20 gl-1 total metallic ion content. As additional substances were used NaCl, Na2SO4.10 H2O, H3BO3, sodium citrate, sodium laurylsulphate, sodium saccharine and NaNO3 as a source for nitrogen inclusion in the films. The concentration of NaNO3 in electrolytic bath was varied with the aim to control the films nitrogen content. Co-Ni-N granular films display GMR effect of about 60%; this could be explained mainly by the elastic spin dependent scattering of conduction electrons at the interface between magnetic (Co- Ni solid solution grains) and nonmagnetic regions (rich in N inter-granular frontiers and aluminium oxidized substrate)..

Keywords

Magnetic properties, Giant magnetoresistance, Thin films, Co-Ni Alloys, Electrodeposition.

Submitted at: Feb. 16, 2008
Accepted at: Aug. 28, 2008

Citation

C. SÎRBU, V. GEORGESCU, Effect of nitrogen addition on morphology and magnetic properties of electrodeposited Co-Ni granular films, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 9, pp. 2396-2401 (2008)