Co/Pt superlattices with ultra-thin Ta seed layer on NiFe underlayer for double-layer perpendicular magnetic recording media

Wenbin Peng, Oliver Keitel, R. H. Victora, Erkan Koparal, Jack H. Judy

Research output: Contribution to journalConference articlepeer-review

11 Scopus citations

Abstract

Co/Pt superlattices with an ultra-thin amorphous Ta seed layer on a Ni45Fe55 underlayer were fabricated for double-layer perpendicular magnetic recording media using a special hard disk sputtering system with a triple-target DC magnetron cathode (Triatron). A 2.5 nm thick Ta seed layer was found to improve the crystalline structure and increase the coercivity of the Co/Pt superlattices from 1.13 to 2.17 kOe. A 2.5 nm Ta layer on a 200 nm thick magnetically soft NiFe underlayer was found to further increase the coercivity from 2.25 to 5 kOe. In addition, the sheared slope of the sides of hysteresis loop of Co/Pt superlattices was significantly improved from about 5 Gauss/Oe (with only a 2.5 nm Ta seed layer) to about 1.1 Gauss/Oe (with both a 2.5 nm Ta seed layer and a 200 nm NiFe underlayer).

Original languageEnglish (US)
Pages (from-to)2390-2392
Number of pages3
JournalIEEE Transactions on Magnetics
Volume36
Issue number5 I
DOIs
StatePublished - Sep 2000
Event2000 International Magnetics Conference (INTERMAG 2000) - Toronto, Ont, Canada
Duration: Apr 9 2000Apr 12 2000

Bibliographical note

Funding Information:
Manuscript received February 15, 2000; revised May 15, 2000. The work of W. Peng, R. H. Victora, and J. H. Judy was supported by the National Storage Industrial Consortium EHDR Program (partly supported by NSF, Award EEC-9732369), and the Seagate Corporation.

Keywords

  • Co/Pt superlattices
  • Double-layer perpendicular magnetic recording media
  • NiFe underlayer
  • Ultra-thin amorphous Ta seed layer

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