Magnetic recording powder, method of manufacturing thereof and a

Details Magnetic recording powder, method of manufacturing thereof and a Magnetic recording powder, method of manufacturing thereof and a

1987-08-12

1989-06-06

Lesmes, George F.

Stock material or miscellaneous articles

Composite

Of inorganic material

252 6263, 423138, 423155, 428402, 428900, C01F 1146, C01G 4902, C04B 3526

Patent

active

048370924

ABSTRACT:
A magnetic recording powder comprising a hexagonal barium ferrite substituted with a coercive force control element. This magnetic powder is preliminarily treated with sulfate ion-containing water so as to convert any free barium ions in the magnetic powder to a water insoluble compound such as BaSO.sub.4 or BaS.sub.2 O.sub.7. There is also proposed a magnetic recording medium having a magnetic layer containing such a magnetic powder as mentioned above.

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patent: 4565726 (1986-01-01), Oguchi et al.
patent: 4699771 (1987-10-01), Yokoyama et al.

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