Varanda, L. C.Goya, G. F.Morales, M. P.Marques, RFCGodoi, RHMJafelicci, M.Serna, C. J.2014-05-202014-05-202002-09-01IEEE Transactions on Magnetics. New York: IEEE-Inst Electrical Electronics Engineers Inc., v. 38, n. 5, p. 1907-1909, 2002.0018-9464http://hdl.handle.net/11449/31913Magnetic properties of acicular (similar to60 and similar to200 nm) iron particles, obtained by reduction of alumina-coated goethite particles, are reported. X-ray diffraction and Mossbauer spectroscopy showed that the particles consist of a alpha-Fe core and a thin surface layer of maghemite. Magnetization data indicated an improvement of similar to28% in the saturation magnetization, coercive field, and squareness for particles with similar to60 nm. This magnetic property enhancement of the present particles, whose size is 40% smaller than those commercially available, could result in a similar decrease of the bit-size for higher density of magnetic media.1907-1909engcoercivitymagnetic recordingmagnetic variable measurementsmetal ultrafine particlespassivationArtigo10.1109/TMAG.2002.802816WOS:000178867200012Acesso restrito2115942621694174