Correlation between activation volume and intergranular magnetic interaction in longitudinal media

M. Mikami; D. D. Djayaprawira; T. K. Kong; S. Yoshimura; A. Horii; M. Takahashi

doi:10.1109/20.950878

Correlation between activation volume and intergranular magnetic interaction in longitudinal media

M. Mikami, D. D. Djayaprawira, T. K. Kong, S. Yoshimura, A. Horii, M. Takahashi

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

8 Citations (Scopus)

Abstract

We have investigated the correlation between activation grain diameter derived from activation volume and intergranular magnetic interaction, in CoCrPt-based thin film media fabricated by ultra clean sputtering process. As the results, we found that activation grain diameter depends on the physical grain diameter and intergranular exchange interaction, but is independent of intergranular magnetostatic interaction (4πM_s/H_k^grain). The activation grain diameter normalized by physical grain diameter, which corresponds with normalized coercivity (H_c/H_k^grain) and microstructure, well indicate the character of intergranular exchange interaction in the media with various compositions. It is also clarified that the media noise can be characterized by activation grain diameter together with intergranular magnetostatic interaction.

Original language	English
Pages (from-to)	1484-1487
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	37
Issue number	4 I
DOIs	https://doi.org/10.1109/20.950878
Publication status	Published - 2001 Jul
Externally published	Yes
Event	8th Joint Magnetism and Magnetic Materials -International Magnetic Conference- (MMM-Intermag) - San Antonio, TX, United States Duration: 2001 Jan 7 → 2001 Jan 11

Keywords

Activation volume
Exchange interaction
Longitudinal media
Thin film

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/20.950878

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title = "Correlation between activation volume and intergranular magnetic interaction in longitudinal media",

abstract = "We have investigated the correlation between activation grain diameter derived from activation volume and intergranular magnetic interaction, in CoCrPt-based thin film media fabricated by ultra clean sputtering process. As the results, we found that activation grain diameter depends on the physical grain diameter and intergranular exchange interaction, but is independent of intergranular magnetostatic interaction (4πMs/Hkgrain). The activation grain diameter normalized by physical grain diameter, which corresponds with normalized coercivity (Hc/Hkgrain) and microstructure, well indicate the character of intergranular exchange interaction in the media with various compositions. It is also clarified that the media noise can be characterized by activation grain diameter together with intergranular magnetostatic interaction.",

keywords = "Activation volume, Exchange interaction, Longitudinal media, Thin film",

author = "M. Mikami and Djayaprawira, {D. D.} and Kong, {T. K.} and S. Yoshimura and A. Horii and M. Takahashi",

note = "Funding Information: Manuscript received October 9, 2000. This work was supported in part by the Storage Research Consortium (SRC), the ASET program (NEDO), and the Regional Consortium Project (NEDO) of Japan. M. Mikami is with the Department of Electronic Engineering, Tohoku University, Sendai, 980-8579 Japan, on leave from the Asahi Komag Co. Ltd., Yonezawa, 992-1128 Japan (e-mail: migac36@ec.ecei. tohoku.ac.jp). T. K. Kong is now with the HOYA Co., Ltd., Akishima, 196-8510 Japan. Publisher Item Identifier S 0018-9464(01)06506-2.; 8th Joint Magnetism and Magnetic Materials -International Magnetic Conference- (MMM-Intermag) ; Conference date: 07-01-2001 Through 11-01-2001",

year = "2001",

month = jul,

doi = "10.1109/20.950878",

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T1 - Correlation between activation volume and intergranular magnetic interaction in longitudinal media

AU - Mikami, M.

AU - Djayaprawira, D. D.

AU - Kong, T. K.

AU - Yoshimura, S.

AU - Horii, A.

AU - Takahashi, M.

N1 - Funding Information: Manuscript received October 9, 2000. This work was supported in part by the Storage Research Consortium (SRC), the ASET program (NEDO), and the Regional Consortium Project (NEDO) of Japan. M. Mikami is with the Department of Electronic Engineering, Tohoku University, Sendai, 980-8579 Japan, on leave from the Asahi Komag Co. Ltd., Yonezawa, 992-1128 Japan (e-mail: migac36@ec.ecei. tohoku.ac.jp). T. K. Kong is now with the HOYA Co., Ltd., Akishima, 196-8510 Japan. Publisher Item Identifier S 0018-9464(01)06506-2.

PY - 2001/7

Y1 - 2001/7

N2 - We have investigated the correlation between activation grain diameter derived from activation volume and intergranular magnetic interaction, in CoCrPt-based thin film media fabricated by ultra clean sputtering process. As the results, we found that activation grain diameter depends on the physical grain diameter and intergranular exchange interaction, but is independent of intergranular magnetostatic interaction (4πMs/Hkgrain). The activation grain diameter normalized by physical grain diameter, which corresponds with normalized coercivity (Hc/Hkgrain) and microstructure, well indicate the character of intergranular exchange interaction in the media with various compositions. It is also clarified that the media noise can be characterized by activation grain diameter together with intergranular magnetostatic interaction.

AB - We have investigated the correlation between activation grain diameter derived from activation volume and intergranular magnetic interaction, in CoCrPt-based thin film media fabricated by ultra clean sputtering process. As the results, we found that activation grain diameter depends on the physical grain diameter and intergranular exchange interaction, but is independent of intergranular magnetostatic interaction (4πMs/Hkgrain). The activation grain diameter normalized by physical grain diameter, which corresponds with normalized coercivity (Hc/Hkgrain) and microstructure, well indicate the character of intergranular exchange interaction in the media with various compositions. It is also clarified that the media noise can be characterized by activation grain diameter together with intergranular magnetostatic interaction.

KW - Activation volume

KW - Exchange interaction

KW - Longitudinal media

KW - Thin film

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Correlation between activation volume and intergranular magnetic interaction in longitudinal media

Abstract

Keywords

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