MAGNETIC RECORDING MEDIUM

PURPOSE:To embody an excellent high-pass characteristic, an excellent overwrite characteristic and good weather resistance by allowing the upper most layer of a specific thickness to contain hexagonal system plate-shaped powder and its adjacent layers to contain a high magnetic permeability material...

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Bibliographic Details
Main Authors KOYAMA NOBORU, TAKEDA KATSUYUKI, GOTO SHIGETO, SHIMIZU YUJI
Format Patent
LanguageEnglish
Published 27.08.1993
Subjects
ADHESIVES
CHEMICAL PAINT OR INK REMOVERS
CHEMISTRY
COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS
CORRECTING FLUIDS
DYES
FILLING PASTES
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
INKS
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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Summary:PURPOSE:To embody an excellent high-pass characteristic, an excellent overwrite characteristic and good weather resistance by allowing the upper most layer of a specific thickness to contain hexagonal system plate-shaped powder and its adjacent layers to contain a high magnetic permeability material. CONSTITUTION:Hexagonal system ferrite having an easy axis of magnetization in the vertical direction is provided on the uppermost layer while the thickness of the layer is specified to be 0.5mum and below. The lower layer is arranged to contain a high magnetic permeability material, thereby producing magnetic pass between inverse magnetization which magnetic flux adjoins and forming a horseshoe-shaped loop. As described above, each magnetization exists in a stabilized manner, which makes it possible to enhance the output. Even when a signal is overwritten, the lower layer, which contains the high magnetic permeability material does not affect this recording medium adversely. What is more, the hexagonal system ferrite powder is excellent in terms of weather resistance, which enhances the reliability.
Bibliography:Application Number: JP19920019190