Co nanowires were produced by deposition in porous alumina templates using different electrolytic bath acidities, in order to study the effect on their magnetic properties. Room temperature FMR measurements and SQUID measurements as a function of temperature showed that the properties of the nanowires are dependent of the bath pH. The results show that the easy magnetization axes change with both temperature and bath acidity. (C) 2007 Elsevier B.V. All rights reserved.