Magnetic viscosity of recording media(alumite) with perpendicular anisotropy

Phan Le Kim; Cock Lodder

doi:10.11485/itetr.23.15.0_81

Magnetic viscosity of recording media(alumite) with perpendicular anisotropy

Phan Le Kim, Cock Lodder

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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Abstract

In this paper, we will present a study on magnetic viscosity of alumite perpendicular media at different thicknesses. Viscosity as a function of applied field(viscosity curve) exhibits a short plateau at low field and then decreases monotonously with increasing field. After correcting for the demagnetizing field, the shape of the intrinsic viscosity curves changes to the well-known shape of viscosity curve of in-plane media, i.e. they have a peak near H_c. The intrinsic viscosity curves obtained from experiments were fitted to an analytical model of Chantrell et al. [1], from which, we found that the effective switching volumes obtained by fitting are much smaller than the column volumes, indicating that the reversal mechanism is incoherent.

Original language	English
Title of host publication	Third Asian Symposium on Information Storage Technology, ASIST-3
Place of Publication	Singapore
Publisher	Institute of Image Information and Television Engineers
Pages	81-88
Number of pages	8
DOIs	https://doi.org/10.11485/itetr.23.15.0_81
Publication status	Published - 25 Feb 1999
Event	3rd Asian Symposium on Information Storage Technology, ASIST 1999 - Singapore, Singapore Duration: 1 Feb 1999 → 2 Feb 1999 Conference number: 3

Publication series

Name	ITE Technical Report
Publisher	The Institute of Image Information and Television Engineers
Number	15
Volume	23
ISSN (Print)	1342-6893

Conference

Conference	3rd Asian Symposium on Information Storage Technology, ASIST 1999
Abbreviated title	ASIST
Country	Singapore
City	Singapore
Period	1/02/99 → 2/02/99

Keywords

Perpendicular media
Alumite
Time-dependence effects
Viscosity
Activation volume
Reversal mechanism

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10.11485/itetr.23.15.0_81

Kim1999magneticFinal published version, 777 KB

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title = "Magnetic viscosity of recording media(alumite) with perpendicular anisotropy",

abstract = "In this paper, we will present a study on magnetic viscosity of alumite perpendicular media at different thicknesses. Viscosity as a function of applied field(viscosity curve) exhibits a short plateau at low field and then decreases monotonously with increasing field. After correcting for the demagnetizing field, the shape of the intrinsic viscosity curves changes to the well-known shape of viscosity curve of in-plane media, i.e. they have a peak near H_c. The intrinsic viscosity curves obtained from experiments were fitted to an analytical model of Chantrell et al. [1], from which, we found that the effective switching volumes obtained by fitting are much smaller than the column volumes, indicating that the reversal mechanism is incoherent.",

keywords = "Perpendicular media, Alumite, Time-dependence effects, Viscosity, Activation volume, Reversal mechanism",

author = "{Le Kim}, Phan and Cock Lodder",

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note = "3rd Asian Symposium on Information Storage Technology, ASIST 1999, ASIST ; Conference date: 01-02-1999 Through 02-02-1999",

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Le Kim, P & Lodder, C 1999, Magnetic viscosity of recording media(alumite) with perpendicular anisotropy. in Third Asian Symposium on Information Storage Technology, ASIST-3. ITE Technical Report, no. 15, vol. 23, Institute of Image Information and Television Engineers, Singapore, pp. 81-88, 3rd Asian Symposium on Information Storage Technology, ASIST 1999, Singapore, Singapore, 1/02/99. https://doi.org/10.11485/itetr.23.15.0_81

Magnetic viscosity of recording media(alumite) with perpendicular anisotropy. / Le Kim, Phan; Lodder, Cock.

Third Asian Symposium on Information Storage Technology, ASIST-3. Singapore : Institute of Image Information and Television Engineers, 1999. p. 81-88 (ITE Technical Report; Vol. 23, No. 15).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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N2 - In this paper, we will present a study on magnetic viscosity of alumite perpendicular media at different thicknesses. Viscosity as a function of applied field(viscosity curve) exhibits a short plateau at low field and then decreases monotonously with increasing field. After correcting for the demagnetizing field, the shape of the intrinsic viscosity curves changes to the well-known shape of viscosity curve of in-plane media, i.e. they have a peak near H_c. The intrinsic viscosity curves obtained from experiments were fitted to an analytical model of Chantrell et al. [1], from which, we found that the effective switching volumes obtained by fitting are much smaller than the column volumes, indicating that the reversal mechanism is incoherent.

AB - In this paper, we will present a study on magnetic viscosity of alumite perpendicular media at different thicknesses. Viscosity as a function of applied field(viscosity curve) exhibits a short plateau at low field and then decreases monotonously with increasing field. After correcting for the demagnetizing field, the shape of the intrinsic viscosity curves changes to the well-known shape of viscosity curve of in-plane media, i.e. they have a peak near H_c. The intrinsic viscosity curves obtained from experiments were fitted to an analytical model of Chantrell et al. [1], from which, we found that the effective switching volumes obtained by fitting are much smaller than the column volumes, indicating that the reversal mechanism is incoherent.

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KW - Alumite

KW - Time-dependence effects

KW - Viscosity

KW - Activation volume

KW - Reversal mechanism

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