Preparation and characterisation of magnetic nanostructures using filtration membranes

To achieve ferromagnetic metal contents higher than those usually obtained in alumite layers, other templates with similar channel-like pores were fil led with ferromagnetic cobalt by means of electrodeposition. Anodisc and tr ack-etch polycarbonate membranes having cylindrical pores of a diameter of 100-300 nm served as such templates. The electrochemical and magnetic prope rties of electrodeposits obtained from a variety of cobalt electrolytes wit h different properties are described. The magnetic behaviour of the electro deposits depends on the shape anisotropy and the crystal anisotropy. Compar ed with the situation in alumite layers, marked. perpendicular magnetic ani sotropy was only found for alloys deposited from hypophosphite and maleic a cid based electrolytes. (C) 2000 Elsevier Science Ltd. All rights reserved.