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Title: Nanocrystalline M-type hexaferrite powders: preparation, geometric and magnetic propertiess
Author: Gornert, P.
Pfeiffer, H.
Sinn, E.
Muller, Rainer
Schuppel, W.
Rosler, M.
Batlle Gelabert, Xavier
García del Muro y Solans, Montserrat
Tejada Palacios, Javier
Galí Medina, Salvador, 1949-
Keywords: Materials nanoestructurats
Propietats magnètiques
Materials magnètics
Substàncies amorfes
Nanostructured materials
Magnetic properties
Magnetic materials
Amorphous substances
Issue Date: 1994
Publisher: IEEE
Abstract: Co-Ti-Sn-Ge substituted M-type bariumhexaferrite powders with mean grain sizes between about 10 nm and about 1 ¿m and a narrow size distribution were prepared reproducibly by means of a modified glass crystallization method. At annealing temperatures between 560 and 580°C of the amorphous flakes nanocrystalline particles grow. They behave superparamagnetically at room temperature and change into stable magnetic single domains at lower temperatures. The magnetic volume of the powders is considerably less than the geometric one. However, the effective anisotropy fields are larger by a Factor of two to three.
Note: Reproducció del document publicat a
It is part of: IEEE Transactions on Magnetics, 1994, vol. 30, núm. 2 (Part 1-2), p. 714-716.
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ISSN: 0018-9464
Appears in Collections:Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)
Articles publicats en revistes (Física de la Matèria Condensada)

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