IEICE TRANSACTIONS on Electronics
Effects of Ta and Pt Addition on Magnetic Properties in CoCrTaPt Perpendicular Magnetic Recording Media
Summary :
With the rapid increase in recording density in recent years, the development of media with high coercivity and low noise has become an important issue in perpendicular as well as longitudinal recording. Compared with the CoCr binary system, the CoCrTa system is more effective in increasing coercivity. The increase in coercivity is due to not Ta segregation but to enhanced Cr segregation at column boundaries caused by Ta addition. When a Ti underlayer with uniform thickness was used, there was no improvement in c-axis alignment of the magnetic layers in CoCrTa and CoCrPt films, although the lattice mismatch of Co ternary alloys with Ti was much reduced compared with that of the CoCr film with Ti. This indicates that there may be no direct heteroepitaxial relationship between Ti underlayer and CoCr alloys at the Ti-Co alloy interface. In the case of the CoCrPt film, perpendicular coercivity increased linearly as Pt content increased up to 10at%. When Pt content was about 13at%, the shape of the M-H loop showed characteristics of domain wall motion reversal, which indicated strong exchange coupling among columns. When Ta content was increased to 4at% in the CoCrPt film, perpendicular coercivity increased and the shape of the M-H loop suggested that the domain wall motion reversal behavior was much reduced. This is thought to be associated with Cr segregation at column boundaries by Ta addition.
- Publication
- IEICE TRANSACTIONS on Electronics Vol.E80-C No.9 pp.1174-1179
- Publication Date
- 1997/09/25
- Publicized
- Online ISSN
- DOI
- Type of Manuscript
- Special Section PAPER (Special Issue on High Density Information Recording Technologies)
- Category
Authors
Keyword
Latest Issue
Copyrights notice of machine-translated contents
The copyright of the original papers published on this site belongs to IEICE. Unauthorized use of the original or translated papers is prohibited. See IEICE Provisions on Copyright for details.
Cite this
Copy
In Seon LEE, Jung Hyuk KOH, Taek Dong LEE, "Effects of Ta and Pt Addition on Magnetic Properties in CoCrTaPt Perpendicular Magnetic Recording Media" in IEICE TRANSACTIONS on Electronics,
vol. E80-C, no. 9, pp. 1174-1179, September 1997, doi: .
Abstract: With the rapid increase in recording density in recent years, the development of media with high coercivity and low noise has become an important issue in perpendicular as well as longitudinal recording. Compared with the CoCr binary system, the CoCrTa system is more effective in increasing coercivity. The increase in coercivity is due to not Ta segregation but to enhanced Cr segregation at column boundaries caused by Ta addition. When a Ti underlayer with uniform thickness was used, there was no improvement in c-axis alignment of the magnetic layers in CoCrTa and CoCrPt films, although the lattice mismatch of Co ternary alloys with Ti was much reduced compared with that of the CoCr film with Ti. This indicates that there may be no direct heteroepitaxial relationship between Ti underlayer and CoCr alloys at the Ti-Co alloy interface. In the case of the CoCrPt film, perpendicular coercivity increased linearly as Pt content increased up to 10at%. When Pt content was about 13at%, the shape of the M-H loop showed characteristics of domain wall motion reversal, which indicated strong exchange coupling among columns. When Ta content was increased to 4at% in the CoCrPt film, perpendicular coercivity increased and the shape of the M-H loop suggested that the domain wall motion reversal behavior was much reduced. This is thought to be associated with Cr segregation at column boundaries by Ta addition.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/e80-c_9_1174/_p
Copy
@ARTICLE{e80-c_9_1174,
author={In Seon LEE, Jung Hyuk KOH, Taek Dong LEE, },
journal={IEICE TRANSACTIONS on Electronics},
title={Effects of Ta and Pt Addition on Magnetic Properties in CoCrTaPt Perpendicular Magnetic Recording Media},
year={1997},
volume={E80-C},
number={9},
pages={1174-1179},
abstract={With the rapid increase in recording density in recent years, the development of media with high coercivity and low noise has become an important issue in perpendicular as well as longitudinal recording. Compared with the CoCr binary system, the CoCrTa system is more effective in increasing coercivity. The increase in coercivity is due to not Ta segregation but to enhanced Cr segregation at column boundaries caused by Ta addition. When a Ti underlayer with uniform thickness was used, there was no improvement in c-axis alignment of the magnetic layers in CoCrTa and CoCrPt films, although the lattice mismatch of Co ternary alloys with Ti was much reduced compared with that of the CoCr film with Ti. This indicates that there may be no direct heteroepitaxial relationship between Ti underlayer and CoCr alloys at the Ti-Co alloy interface. In the case of the CoCrPt film, perpendicular coercivity increased linearly as Pt content increased up to 10at%. When Pt content was about 13at%, the shape of the M-H loop showed characteristics of domain wall motion reversal, which indicated strong exchange coupling among columns. When Ta content was increased to 4at% in the CoCrPt film, perpendicular coercivity increased and the shape of the M-H loop suggested that the domain wall motion reversal behavior was much reduced. This is thought to be associated with Cr segregation at column boundaries by Ta addition.},
keywords={},
doi={},
ISSN={},
month={September},}
Copy
TY - JOUR
TI - Effects of Ta and Pt Addition on Magnetic Properties in CoCrTaPt Perpendicular Magnetic Recording Media
T2 - IEICE TRANSACTIONS on Electronics
SP - 1174
EP - 1179
AU - In Seon LEE
AU - Jung Hyuk KOH
AU - Taek Dong LEE
PY - 1997
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E80-C
IS - 9
JA - IEICE TRANSACTIONS on Electronics
Y1 - September 1997
AB - With the rapid increase in recording density in recent years, the development of media with high coercivity and low noise has become an important issue in perpendicular as well as longitudinal recording. Compared with the CoCr binary system, the CoCrTa system is more effective in increasing coercivity. The increase in coercivity is due to not Ta segregation but to enhanced Cr segregation at column boundaries caused by Ta addition. When a Ti underlayer with uniform thickness was used, there was no improvement in c-axis alignment of the magnetic layers in CoCrTa and CoCrPt films, although the lattice mismatch of Co ternary alloys with Ti was much reduced compared with that of the CoCr film with Ti. This indicates that there may be no direct heteroepitaxial relationship between Ti underlayer and CoCr alloys at the Ti-Co alloy interface. In the case of the CoCrPt film, perpendicular coercivity increased linearly as Pt content increased up to 10at%. When Pt content was about 13at%, the shape of the M-H loop showed characteristics of domain wall motion reversal, which indicated strong exchange coupling among columns. When Ta content was increased to 4at% in the CoCrPt film, perpendicular coercivity increased and the shape of the M-H loop suggested that the domain wall motion reversal behavior was much reduced. This is thought to be associated with Cr segregation at column boundaries by Ta addition.
ER -
English
