Magnetic properties of acicular ultrafine iron particles

Artículos de revistas

Date

2002-09-01

Registration in:

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

0018-9464

http://hdl.handle.net/11449/31913

10.1109/TMAG.2002.802816

WOS:000178867200012

2115942621694174

Author

Universidade Estadual Paulista (Unesp)

Universidade de São Paulo (USP)

Inst Ciência Mat

Univ Antwerp

Institutions

Universidade Estadual Paulista (Brasil)

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.

Subjects

coercivity

magnetic recording

magnetic variable measurements

metal ultrafine particles

passivation

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