Compositions – Magnetic – Iron-oxygen compound containing
Patent
1996-07-25
1998-12-08
Bonner, Melissa
Compositions
Magnetic
Iron-oxygen compound containing
252 6263, 252 6258, 252 6257, 423593, 428694GT, 428694T, H01R 110
Patent
active
058464492
ABSTRACT:
A magnet powder has a primary phase of hexagonal magnetoplumbite ferrite of the formula: A.sub.1-x R.sub.x (Fe.sub.12-y M.sub.y).sub.z O.sub.19 wherein A is Sr, Ba, Ca or Pb; R is Y, rare earth element or Bi (R essentially containing La); M is Zn or Cd; x, y, and z representative of a molar ratio are 0.04.ltoreq.x.ltoreq.0.45, 0.04.ltoreq.y.ltoreq.0.45, and 0.7.ltoreq.z.ltoreq.1.2. This ferrite is increased in saturation magnetization, offering a magnet having high remanence and maximum energy product. The magnet powder may be fired into a sintered magnet or bound into a bonded magnet. A magnetic recording medium comprising the magnet powder as a coating layer is provided as well as a magnetic recording medium comprising a thin film magnetic layer of the hexagonal magnetoplumbite ferrite.
REFERENCES:
patent: 4440713 (1984-04-01), Rigby
patent: 4855205 (1989-08-01), Saha et al.
patent: 5538657 (1996-07-01), Ogata et al.
Du et al, "Magnetic Properties and High Tempeature Composition of the La.sub.x Ba.sub.(1-x) Fe.sub.(12-x) Zn.sub.x O.sub.19 Ferrites", J. Magnetism and Magnetic Materials, vol. 31-34 (2), 1983, pp. 793-794. No month.
Japanese Journal of Applied Physics, vol. 24, No. 1, pp. 51-56, Jan. 1985, Hiroshi Kojima, et al., "Magnetic Properties of W-Type Hexaferrite Powders".
Seance, pp. 3069-3072, Jun. 17, 1957, Andre Deshamps, et al., "Sur La Substitution De Baryum Par Une Terre Rare Dans L'Hexaferrite BaO, 6Fe.sub.2 O.sub.3 ".
J. Phys. Chem. Solids, vol. 4, pp. 217-222, 1958, A.H. Mones, et al., "Cation Substitutions In BaFe.sub.12 O.sub.19 ". No month.
Indian Journal of Pure & Applied Physics, vol. 8, pp. 412-415, Jul. 1970, V.N. Mulay, et al., "Synthesis & Properties of Some New Ferrites of Formula La.sup.3+ Me.sup.2+ Fe.sup.3+ O.sub.19 ".
J. Phys. Chem. Solids, vol. 35, pp. 1633-1639, 1974, F.K. Lotgering, "Magnetic Anisotropy and Saturation of LaFe.sub.12 O.sub.19 and Some Related Compounds". No month.
J. Phys. Chem. Solids, vol. 35, pp. 1641-1643, 1974, A.M. Van Diepen, et al., "Moessbauer Effect In LaFe.sub.12 O.sub.19 ". No month.
J. Phys. Chem. Solids, vol. 2, pp. 312-317, 1957, R.N. Summergrad, et al., "New Hexagonal Ferrimagnetic Oxides". No month.
Suwa Kenichiro
Taguchi Hitoshi
Takeishi Taku
Bonner Melissa
TDK Corporation
LandOfFree
Magnet powder, sintered magnet, bonded magnet, and magnetic reco does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Magnet powder, sintered magnet, bonded magnet, and magnetic reco, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnet powder, sintered magnet, bonded magnet, and magnetic reco will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-173936