MAGNETIC AND READ WRITE PERFORMANCE OF COCRTAPT PERPENDICULAR MEDIA

Third element additions have been effectively employed in CoCrX alloys for longitudinal recording as a means of improving magnetic performan ce. In this work, we report on similar modifications to perpendicular (perpendicular to) magnetic storage media. Specifically, we show how s olid solutions of approximate to 10 at.% Pt in 78Co-17Cr-5Ta perpendic ular to recording media result in a significant increase in perpendicu lar to anisotropy, coercivity and remanent magnetization. The impact o n recording performance is manifested by an increase in pulse amplitud e and a decrease in pulse width, combining to yield approximate to 25% increase in linear storage density. X-ray diffraction measurements sh ow the Pt to be in solid solution with the Co lattice, and it is sugge sted that the increased anisotropy results from the Pt altering the in trinsic crystalline anisotropy constant of the alloy.