Magnetic properties of acicular ultrafine iron particles

Varanda, L. C.; Goya, G. F.; Morales, M. P.; Marques, RFC; Godoi, RHM; Jafelicci, M.; Serna, C. J.

Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/31913

Title:

Magnetic properties of acicular ultrafine iron particles

Author(s):

Institution:

Universidade Estadual Paulista (UNESP)
Universidade de São Paulo (USP)
Inst Ciência Mat
Univ Antwerp

ISSN:

0018-9464

Abstract:

Magnetic 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.

Issue Date:

1-Sep-2002

Citation:

IEEE Transactions on Magnetics. New York: IEEE-Inst Electrical Electronics Engineers Inc., v. 38, n. 5, p. 1907-1909, 2002.

Time Duration:

1907-1909

Publisher:

Institute of Electrical and Electronics Engineers (IEEE)

Keywords:

coercivity
magnetic recording
magnetic variable measurements
metal ultrafine particles
passivation

Source:

http://dx.doi.org/10.1109/TMAG.2002.802816

URI:

Access Rights:

Acesso restrito

Type:

outro

Source:

http://repositorio.unesp.br/handle/11449/31913

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