MAGNETIC MATERIALS AND METHOD OF MAKING SAME

MAGNETIC MATERIALS AND METHOD OF MAKING SAME

This invention relates to a magnetic material having particle cores of arbitrary configuration, the surface of which is coated with a layer of a ferromagnetic metal or alloy such as of Co or Ni or the like, having high coercive force and high magnetic flux density. When the particle cores are spicul...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: ISHIKAWA T,JA, IMAOKA Y,JA, UEHORI T,JA, TADA T,JA
Format: Patent
Sprache:eng
Schlagworte:
BASIC ELECTRIC ELEMENTS
ELECTRICITY
INDUCTANCES
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
MAGNETS
PHYSICS
SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
TRANSFORMERS
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Beschreibung
Zusammenfassung:This invention relates to a magnetic material having particle cores of arbitrary configuration, the surface of which is coated with a layer of a ferromagnetic metal or alloy such as of Co or Ni or the like, having high coercive force and high magnetic flux density. When the particle cores are spicular, the spicular shape is maintained after the deposition of the ferromagnetic metals. The properties of the ferromagnetic material thus obtained are improved by heat treatment and are excellently usable as a magnetic recording medium and permanent magnets. The method of preparing the material comprises dispersing the particles in a solution containing metallic ions, heating the solution in a H2 atmosphere at high pressures and heat-treating the resultant precipitate.