학술논문
Preparation and magnetic properties of hollow nano-spheres of cobalt and cobalt oxide: Drastic cooling-field effects on remnant magnetization of antiferromagnet.
Document Type
Article
Author
Source
Subject
*COBALT
*OXIDES
*MAGNETIC properties
*MAGNETISM
*MAGNETIZATION
*ANTIFERROMAGNETISM
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Language
ISSN
0003-6951
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. [ABSTRACT FROM AUTHOR]