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

doi:10.1109/20.908441

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

Electrical and Computer Engineering

Research output: Contribution to journal › Conference article › peer-review

13 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 language	English (US)
Pages (from-to)	2390-2392
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	36
Issue number	5 I
DOIs	https://doi.org/10.1109/20.908441
State	Published - Sep 2000
Event	2000 International Magnetics Conference (INTERMAG 2000) - Toronto, Ont, Canada Duration: Apr 9 2000 → Apr 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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10.1109/20.908441

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

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).",

keywords = "Co/Pt superlattices, Double-layer perpendicular magnetic recording media, NiFe underlayer, Ultra-thin amorphous Ta seed layer",

author = "Wenbin Peng and Oliver Keitel and Victora, {R. H.} and Erkan Koparal and Judy, {Jack H.}",

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.; 2000 International Magnetics Conference (INTERMAG 2000) ; Conference date: 09-04-2000 Through 12-04-2000",

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T1 - Co/Pt superlattices with ultra-thin Ta seed layer on NiFe underlayer for double-layer perpendicular magnetic recording media

AU - Peng, Wenbin

AU - Keitel, Oliver

AU - Victora, R. H.

AU - Koparal, Erkan

AU - Judy, Jack H.

N1 - 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.

PY - 2000/9

Y1 - 2000/9

N2 - 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).

AB - 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).

KW - Co/Pt superlattices

KW - Double-layer perpendicular magnetic recording media

KW - NiFe underlayer

KW - Ultra-thin amorphous Ta seed layer

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Y2 - 9 April 2000 through 12 April 2000

ER -

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

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