High-coercivity ultralight transparent magnets
Gich García, Martí (Institut de Ciència de Materials de Barcelona)
Roig i Serra, Anna (Institut de Ciència de Materials de Barcelona)
American Physical Society

Data:	2003
Resum:	Magnetic silica-aerogel composites have been synthesized by dispersing hard magnetic Nd2Fe14B particles in a sol during a fast sol-gel process and subsequently supercritically drying the resulting gels. The composites are found to retain most of the outstanding properties of their constituents: the large coercivity and moderate remanence of the magnetic powders and the transparency and low density of silica aerogels. Moreover, aerogels synthesized in the presence of a magnetic field exhibit the alignment of the particles, forming needle-like structures along the direction of the applied magnetic field, which results in optical and magnetic anisotropies. Due to their unique combination of properties, these types of materials may be appealing for magneto-optics and magnetic actuator applications.
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Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Magnetic fields ; Materials properties ; Coercive force ; Gels ; Magnetic anisotropy ; Magnets ; Powders ; Remanence ; Silica ; Sol gel processing
Publicat a:	Applied physics letters, Vol. 82, Issue 24 (June 2003) , p. 4307-4309, ISSN 1077-3118

DOI: 10.1063/1.1578538

4 p, 399.7 KB

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