Seedlayer and Preheating Effects on Crystallography and Recording Performance of CoCrPtB Perpendicular Media

Authors

Min Zheng, MMC Technology, Inc., San Jose, CA
Geon Choe, MMC Technology, Inc., San Jose, CA
Kenneth E. Johnson, MMC Technology, Inc., San Jose, CA
Lan Gao, University of Nebraska - Lincoln
Sy_Hwang Liou, University of Nebraska-LincolnFollow

Date of this Version

September 2002

Comments

Published in IEEE Transactions on Magnetics 38:5 (September 2002), pp. 1979-1981. Copyright 2002 IEEE. Used by permission.
IEEE Transactions on Magnetics homepage is at http://www.ieeemagnetics.org/Smag/ieeetrans.html

Abstract

The effects of seedlayer (SL) and preheating on the crystallographic, magnetic, and recording properties of CoCr₁₈Pt₁₆B₄ granular perpendicular magnetic media have been investigated. For the media with Ru as underlayer, although higher preheating improves both coercivity and squareness, the media is much noisier. With introducing Ta SL, Ru (0002)/Co (0002) crystallography is greatly enhanced. High coercivity, unity squareness, and negative nucleation field are achieved even at low preheating without degrading signal-to-noise ratio. In addition, the media is magnetically stable for a wide range of recording density.