Magnetic recording powder having low curie temperature and high

Details Magnetic recording powder having low curie temperature and high Magnetic recording powder having low curie temperature and high

1994-12-01

1996-08-06

Bonner, Melissa

Compositions

Magnetic

Iron-oxygen compound containing

252 6263, 252 6264, 252 626, 252 6262, 423594, C04B 3526

Patent

active

055430708

ABSTRACT:
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.degree. C. or lower.

REFERENCES:
patent: 5062983 (1991-11-01), Yamamoto et al.

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