Magnetisches Aufzeichnungspulver mit niedriger Curie-Temperatur und hoher Sättigungsmagnetisierung

This invention relates to a magnetic recording powder having a low Curie temperature and a high saturation magnetization ( sigma s). The magnetic recording powder of this invention is of a composite oxide having a hexagonal ferrite type crystal structure comprises: (a) between 14 and 20 atomic % of...

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Bibliographische Detailangaben
Hauptverfasser:	TAKESHITA, TAKUO, KITAMOTO, SAITAMA, JP, OOKUBO, KIYOYUKI, KITAMOTO, SAITAMA, JP, IGARASHI, KAZUNORI, KITAMOTO, SAITAMA, JP, KOMADA, NORIKAZU, KITAMOTO, SAITAMA, JP, ISHIYAMA, KOUICHI, KITAMOTO, SAITAMA, JP
Format:	Patent
Sprache:	ger
Schlagworte:	ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F CORRECTING FLUIDS DYES FILLING PASTES INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER INKS INORGANIC CHEMISTRY METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PHYSICS POLISHES USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	This invention relates to a magnetic recording powder having a low Curie temperature and a high saturation magnetization ( sigma s). The magnetic recording powder of this invention is of a composite oxide having a hexagonal ferrite type crystal structure comprises: (a) between 14 and 20 atomic % of at least one of strontium oxide and barium oxide, (b) between 15 and 40 atomic % of chromium oxide, (c) between 2 and 15 atomic % of at least one member of the group consisting of zinc oxide, magnesium oxide and copper oxide, (d) between 2 and 15 atomic % of at least one member of the group consisting of titanium oxide, zirconium oxide and tin oxide, with substantial remainder being iron oxide and unavoidable impurities. Further, the magnetic recording powder of this invention is of a composite oxide having saturation magnetization ( sigma s) of 15 emu/g or higher, and a Curie temperature (Tc) of 155 DEG C. or lower.