MAGNETIC ALLOY FOR MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING APPARATUS USING THE MAGNETIC ALLOY
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United States of America Patent
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app pub date -
Apr 30, 2008
filing date -
Jul 29, 2002
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Abstract
A magnetic alloy for a magnetic recording medium contains 40 to 60 at % of Pt and 60 to 40 at % of at least three species selected from the group consisting of Fe, Co, Mn and Cr as 3d transition metal elements. The magnetic alloy has a Co content of 10 to 0 at %, has an average of valence electron numbers in the 3d transition metal elements of 7.5 to 8.0 based on compositional proportions and has an order parameter S of 0.5 to 1 that is calculated from: S=[{F(002).sup.2/F(001).sup.2}.times.{L(002)/L(001)}.times.{(A(002)/A(001-)}.times.{I(001)/I(002)}].sup.1/2, in which F (plane direction), L (plane direction), A (plane direction) and I (plane direction) represent structure factor, Lorentz factor, sorption factor and integrated intensity as measured through X-ray diffraction (.theta./2.theta.) of the magnetic alloy in a corresponding plane direction, respectively.
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