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abstract ACo 38 Fe 61 Rh 1 alloy with high saturation magnetic flux density, Bs, of 2.4T was produced by electrodepo-sition from a solution containing RhCl 3 ,NH 4 Cl, H 3 BO 3 , CoSO 4 , FeSO 4 , saccharin, NaLS (Na-lauryl sulfate)at pH 2.0. This alloy showed excellent corrosion resistance, which was comparable to sputtered 2.4TCo 40 Fe 60 alloy. It has been demonstrated that CoFeRh films with Bs=2.3–2.4T can be obtained at lowercurrent density and lower concentration of RhCl 3 in the plating solution. The increase of current den-sity and RhCl 3 concentration brings about increase of Rh-content in CoFeRh films with higher corrosionresistance, but lower Bs value. The co-electrodeposition of Co and Fe at the controlled potential occursat more positive potentials (−0.6 to −0.8V vs. SCE) in the presence of RhCl 3 in the plating solution. Thisphenomenon is possibly driven by the negative enthalpy of CoFeRh formation and/or through inducedco-deposition of CoFeRh from a mixed-metal complex as an electroactive intermediate. It is also demon-strated that the decrease of the Bs value of CoFeRh alloys from 2.4 to 1.2T is linked to the increase ofnonmagnetic elements, i.e. Rh, O, H, S, C, N, and Cl, in the CoFeRh deposit.© 2008 Published by Elsevier Ltd.