The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 08, 1998
Filed:
Jul. 25, 1996
TDK Corporation, Tokyo, JP;
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.