Title :
Magnetic and read/write performance of CoCrTaPt perpendicular media
Author :
Nagaoka, T. ; Baldwin, C. ; Payne, A.P.
Author_Institution :
Shibukawa Plant, Gumma, Japan
fDate :
11/1/1995 12:00:00 AM
Abstract :
Third element additions have been effectively employed in CoCrX alloys for longitudinal recording as a means of improving magnetic performance. In this work, we report on similar modifications to Perpendicular (⊥) magnetic storage media. Specifically, we show how solid solutions of ≈10 at.% Pt in 78Co-17Cr-5Ta ⊥ recording media result in a significant increase in ⊥ anisotropy, coercivity and remanent magnetization. The impact on recording performance is manifested by an increase in pulse amplitude and a decrease in pulse width, combining to yield ≈25% increase in linear storage density. X-ray diffraction measurements show the Pt to be in solid solution with the Co lattice, and it is suggested that the increased anisotropy results from the Pt altering the intrinsic crystalline anisotropy constant of the alloy
Keywords :
X-ray diffraction; chromium alloys; cobalt alloys; coercive force; ferromagnetic materials; magnetic thin films; perpendicular magnetic anisotropy; perpendicular magnetic recording; platinum alloys; remanence; solid solutions; tantalum alloys; CoCrTaPt; X-ray diffraction measurements; coercivity; intrinsic crystalline anisotropy constant; linear storage density; magnetic storage media; perpendicular media; pulse amplitude; pulse width; read/write performance; remanent magnetization; solid solutions; Anisotropic magnetoresistance; Coercive force; Magnetic anisotropy; Magnetic memory; Magnetization; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Solids; Space vector pulse width modulation; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
