The paper presents a device for magnetic nanoparticles production. Such nan
oparticles may be used for the preparation of ferrofluids or magneto-rheolo
gical fluids. The device may operate in several regimes: transferred plasma
are, non-transferred are, TIG or MIG. Ferro- and ferrimagnetic particles w
ith diameters between 3 and 110 MI, as well as crystalline or amorphous gra
phite particles with a mean diameter of 6.4 nm were obtained. (C) 1999 Else
vier Science B.V. All rights reserved.