FERRITE PARTICLE FOR MAGNETIC RECORDING MEDIUM

PROBLEM TO BE SOLVED: To provide a new ferrite particle suitable for high-density magnetic recording. SOLUTION: The ferrite particle for a magnetic recording medium has an M type ferrite structure, a rare earth element R containing Ca, La essentially, and Sr, Fe and Co as essential elements and has...

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Hauptverfasser:	IWASAKI HIROSHI, TAKAMI TAKASHI
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS CHEMISTRY COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F ELECTRICITY INDUCTANCES INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER INORGANIC CHEMISTRY MAGNETS METALLURGY PHYSICS SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES TRANSFORMERS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a new ferrite particle suitable for high-density magnetic recording. SOLUTION: The ferrite particle for a magnetic recording medium has an M type ferrite structure, a rare earth element R containing Ca, La essentially, and Sr, Fe and Co as essential elements and has the composition shown by the formula: Ca1-x-yRxSryFe2n-zCoz(wherein (1-x-y) is the content of Ca and 0.3≤(1-x-y)≤0.65; x is the content of the rare earth element R and 0.2≤x≤0.65; y is the content of Sr and 0.001≤y≤0.2; z is the content of Co and 0.03≤z≤0.65; n is a molar ratio and 4≤n≤7; (1-x-y)>y, (1-x-y)>z>y, x>z>y are satisfied). COPYRIGHT: (C)2010,JPO&INPIT