TITLE

Preparation and magnetic properties of hollow nano-spheres of cobalt and cobalt oxide: Drastic cooling-field effects on remnant magnetization of antiferromagnet

AUTHOR(S)
Yoshikawa, Hirofumi; Hayashida, Kenta; Kozuka, Yasuharu; Horiguchi, Asami; Awaga, Kunio; Bandow, Shunji; Iijima, Sumio
PUB. DATE
November 2004
SOURCE
Applied Physics Letters;11/29/2004, Vol. 85 Issue 22, p5287
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We investigate the making of magnetic hollow spheres of Co3O4 (2) and fcc Co (3) with diameter 500 nm and thickness 40 nm, using polystyrene-bead templates. The spheres are characterized by scanning electron microscope, transmission electron microscope, electron diffraction, and x-ray diffraction. Magnetic measurements on 2 reveal a drastic enhancement of remnant magnetization below TN induced by cooling-field, while measurements on 3 indicate a soft ferromagnetism similar to that of bulk fcc Co.
ACCESSION #
15244143

 

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