Effect of grain size distribution on thermal decay in perpendicular recording with double layered media and single pole head by micromagnetic modeling

S. C. Lee, Y. W. Tahk, Kyoung Jin Lee, T. D. Lee

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Summary form only given. In this work, micromagnetic simulations of the read/write process for perpendicular systems have been performed. In higher recording densities, grain size distribution is more important due to the dependency of thermal decay and SNR on grain size distribution. Therefore the magnetic layer was simulated by a Voronoi cell with different standard deviation of grain sizes. The effect of a soft under layer (SUL) on read/write was calculated by using a cubic cell. For a realistic writing head field, we used the single pole head field calculated by micromagnetics. Width and thickness of the write pole was 60 nm and 160 nm, respectively. Head sweep velocity during the writing process was taken to be 40 m/s. SNR and thermal decay at a linear density of 1058 kfci were calculated as a function of the different standard deviations of grain sizes. Thermal decay over a long time scale was investigated by the Langevin equation and the time-temperature scaling method. SNR is calculated by the reciprocity principle in a shielded magnetoresistive head.

Original languageEnglish
Title of host publicationJoint NAPMRC 2003 - Digest of Technical Papers [Perpendicular Magnetic Recording Conference]
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages34
Number of pages1
ISBN (Print)078037746X, 9780780377462
DOIs
Publication statusPublished - 2003
Externally publishedYes
EventJoint 2nd North American Perpendicular Magnetic Recording Conference, NAPMRC 2003 and 6th Perpendicular Magnetic Recording Conference - Monterey, United States
Duration: 2003 Jan 62003 Jan 8

Other

OtherJoint 2nd North American Perpendicular Magnetic Recording Conference, NAPMRC 2003 and 6th Perpendicular Magnetic Recording Conference
CountryUnited States
CityMonterey
Period03/1/603/1/8

Keywords

  • Anisotropic magnetoresistance
  • Grain size
  • Magnetic anisotropy
  • Magnetic domains
  • Magnetic heads
  • Micromagnetics
  • Nonhomogeneous media
  • Perpendicular magnetic anisotropy
  • Perpendicular magnetic recording
  • Writing

ASJC Scopus subject areas

  • Engineering(all)

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