Produção Nacional
Magnetic properties of acicular ultrafine iron particles
2002; IEEE Magnetics Society; Volume: 38; Issue: 5 Linguagem: Inglês
10.1109/tmag.2002.802816
ISSN1941-0069
AutoresLaudemir C. Varanda, Gerardo F. Goya, M. P. Morales, Rodrigo Fernando Costa Marques, Ricardo H. M. Godoi, Miguel Jafelicci, Carlos J. Serna,
Tópico(s)Magnetic properties of thin films
ResumoMagnetic properties of acicular (/spl sim/60 and /spl sim/200 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 an /spl alpha/-Fe core and a thin surface layer of maghemite. Magnetization data indicated an improvement of /spl sim/28% in the saturation magnetization, coercive field, and squareness for particles with /spl sim/60 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.
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