Magnetic and recording characteristics of perpendicular magnetic media with different anisotropy orientation dispersions

G. Choe; M. Zheng; E. N. Abarra; B. R. Acharya; K. J. Lee

doi:10.1063/1.1847911

Magnetic and recording characteristics of perpendicular magnetic media with different anisotropy orientation dispersions

G. Choe, M. Zheng, E. N. Abarra, B. R. Acharya, K. J. Lee

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

15 Citations (Scopus)

Abstract

A systematic investigation of the magnetic and recording characteristics of CoPtCrO media with different Co grain magnetic anisotropy orientation dispersion (AOD) is performed. AOD is characterized by Δ θ50 of the x-ray diffraction Co peak. AOD was systematically varied between 3.3°and 10.5°by varying the growth condition of Ru layer. With increasing AOD, more grain-boundary segregation occurs, resulting in reduced exchange coupling. Micromagnetic simulation and experimentally measured time dependence of coercivity indicate that magnetic switching of well-isolated Co particles is affected by exchange coupling strength as well as Co AOD. Higher coercivity, narrower switching field distribution, and good thermal stability are achieved with lower Co AOD. Reduced Co AOD leads to a substantial decrease of both transition jitter and dc noise.

Original language	English
Article number	10N503
Journal	Journal of Applied Physics
Volume	97
Issue number	10
DOIs	https://doi.org/10.1063/1.1847911
Publication status	Published - 2005 May 15
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1063/1.1847911

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title = "Magnetic and recording characteristics of perpendicular magnetic media with different anisotropy orientation dispersions",

abstract = "A systematic investigation of the magnetic and recording characteristics of CoPtCrO media with different Co grain magnetic anisotropy orientation dispersion (AOD) is performed. AOD is characterized by Δ θ50 of the x-ray diffraction Co peak. AOD was systematically varied between 3.3°and 10.5°by varying the growth condition of Ru layer. With increasing AOD, more grain-boundary segregation occurs, resulting in reduced exchange coupling. Micromagnetic simulation and experimentally measured time dependence of coercivity indicate that magnetic switching of well-isolated Co particles is affected by exchange coupling strength as well as Co AOD. Higher coercivity, narrower switching field distribution, and good thermal stability are achieved with lower Co AOD. Reduced Co AOD leads to a substantial decrease of both transition jitter and dc noise.",

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T1 - Magnetic and recording characteristics of perpendicular magnetic media with different anisotropy orientation dispersions

AU - Choe, G.

AU - Zheng, M.

AU - Abarra, E. N.

AU - Acharya, B. R.

AU - Lee, K. J.

PY - 2005/5/15

Y1 - 2005/5/15

N2 - A systematic investigation of the magnetic and recording characteristics of CoPtCrO media with different Co grain magnetic anisotropy orientation dispersion (AOD) is performed. AOD is characterized by Δ θ50 of the x-ray diffraction Co peak. AOD was systematically varied between 3.3°and 10.5°by varying the growth condition of Ru layer. With increasing AOD, more grain-boundary segregation occurs, resulting in reduced exchange coupling. Micromagnetic simulation and experimentally measured time dependence of coercivity indicate that magnetic switching of well-isolated Co particles is affected by exchange coupling strength as well as Co AOD. Higher coercivity, narrower switching field distribution, and good thermal stability are achieved with lower Co AOD. Reduced Co AOD leads to a substantial decrease of both transition jitter and dc noise.

AB - A systematic investigation of the magnetic and recording characteristics of CoPtCrO media with different Co grain magnetic anisotropy orientation dispersion (AOD) is performed. AOD is characterized by Δ θ50 of the x-ray diffraction Co peak. AOD was systematically varied between 3.3°and 10.5°by varying the growth condition of Ru layer. With increasing AOD, more grain-boundary segregation occurs, resulting in reduced exchange coupling. Micromagnetic simulation and experimentally measured time dependence of coercivity indicate that magnetic switching of well-isolated Co particles is affected by exchange coupling strength as well as Co AOD. Higher coercivity, narrower switching field distribution, and good thermal stability are achieved with lower Co AOD. Reduced Co AOD leads to a substantial decrease of both transition jitter and dc noise.

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Magnetic and recording characteristics of perpendicular magnetic media with different anisotropy orientation dispersions

Abstract

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