Oxygen effect on the microstructure and magnetic properties of binary copt thin films for perpendicular recording

Takashi Hikosaka; Tomoko Komai; Yoichiro Tanaka

doi:10.1109/20.333978

Oxygen effect on the microstructure and magnetic properties of binary copt thin films for perpendicular recording

Takashi Hikosaka, Tomoko Komai, Yoichiro Tanaka

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

Abstract

This paper presents the effect of oxygen on the microstructure of Co - 18 at. % Pt perpendicular medium. Oxygen addition to the CoPt films during high Ar pressure (4 Pa) sputtering successfully increased the perpendicular coercivity. 188 kA/m coercivity and 1.2 tesla (T) saturation magnetization were obtained. The perpendicular anisotropy energy was at least 570 kJ/m3. AEM and EDX measurements revealed that the film was composed of crystal grains and amorphous boundaries and that oxygen segregated clearly inside the amorphous boundaries. A TEM image showed a 10 nm grain diameter independent of the oxygen partial pressure. For CoPt films deposited under a lower Ar pressure (2 Pa), oxygen has been found to exist uniformly within the grains and boundaries and showed no significant effect on coercivity.

Original language	English
Pages (from-to)	4026-4028
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	30
Issue number	6
DOIs	https://doi.org/10.1109/20.333978
Publication status	Published - 1994 Nov
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Access to Document

10.1109/20.333978

Fingerprint Dive into the research topics of 'Oxygen effect on the microstructure and magnetic properties of binary copt thin films for perpendicular recording'. Together they form a unique fingerprint.

Cite this

@article{0cc6824b315740bfaf7eb4665aecc3c8,

title = "Oxygen effect on the microstructure and magnetic properties of binary copt thin films for perpendicular recording",

abstract = "This paper presents the effect of oxygen on the microstructure of Co - 18 at. % Pt perpendicular medium. Oxygen addition to the CoPt films during high Ar pressure (4 Pa) sputtering successfully increased the perpendicular coercivity. 188 kA/m coercivity and 1.2 tesla (T) saturation magnetization were obtained. The perpendicular anisotropy energy was at least 570 kJ/m3. AEM and EDX measurements revealed that the film was composed of crystal grains and amorphous boundaries and that oxygen segregated clearly inside the amorphous boundaries. A TEM image showed a 10 nm grain diameter independent of the oxygen partial pressure. For CoPt films deposited under a lower Ar pressure (2 Pa), oxygen has been found to exist uniformly within the grains and boundaries and showed no significant effect on coercivity.",

author = "Takashi Hikosaka and Tomoko Komai and Yoichiro Tanaka",

year = "1994",

month = nov,

doi = "10.1109/20.333978",

language = "English",

volume = "30",

pages = "4026--4028",

journal = "IEEE Transactions on Magnetics",

issn = "0018-9464",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

number = "6",

}

TY - JOUR

T1 - Oxygen effect on the microstructure and magnetic properties of binary copt thin films for perpendicular recording

AU - Hikosaka, Takashi

AU - Komai, Tomoko

AU - Tanaka, Yoichiro

PY - 1994/11

Y1 - 1994/11

N2 - This paper presents the effect of oxygen on the microstructure of Co - 18 at. % Pt perpendicular medium. Oxygen addition to the CoPt films during high Ar pressure (4 Pa) sputtering successfully increased the perpendicular coercivity. 188 kA/m coercivity and 1.2 tesla (T) saturation magnetization were obtained. The perpendicular anisotropy energy was at least 570 kJ/m3. AEM and EDX measurements revealed that the film was composed of crystal grains and amorphous boundaries and that oxygen segregated clearly inside the amorphous boundaries. A TEM image showed a 10 nm grain diameter independent of the oxygen partial pressure. For CoPt films deposited under a lower Ar pressure (2 Pa), oxygen has been found to exist uniformly within the grains and boundaries and showed no significant effect on coercivity.

AB - This paper presents the effect of oxygen on the microstructure of Co - 18 at. % Pt perpendicular medium. Oxygen addition to the CoPt films during high Ar pressure (4 Pa) sputtering successfully increased the perpendicular coercivity. 188 kA/m coercivity and 1.2 tesla (T) saturation magnetization were obtained. The perpendicular anisotropy energy was at least 570 kJ/m3. AEM and EDX measurements revealed that the film was composed of crystal grains and amorphous boundaries and that oxygen segregated clearly inside the amorphous boundaries. A TEM image showed a 10 nm grain diameter independent of the oxygen partial pressure. For CoPt films deposited under a lower Ar pressure (2 Pa), oxygen has been found to exist uniformly within the grains and boundaries and showed no significant effect on coercivity.

UR - http://www.scopus.com/inward/record.url?scp=0028550869&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0028550869&partnerID=8YFLogxK

U2 - 10.1109/20.333978

DO - 10.1109/20.333978

M3 - Article

AN - SCOPUS:0028550869

VL - 30

SP - 4026

EP - 4028

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

SN - 0018-9464

IS - 6

ER -

Oxygen effect on the microstructure and magnetic properties of binary copt thin films for perpendicular recording

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Cite this