Thermal stability in perpendicular recording media

Takehito Shimatsu, Hiroyuki Uwazumi, Hiroaki Muraoka, Yoshihisa Nakamura

Research output: Contribution to journalConference articlepeer-review

28 Citations (Scopus)


Magnetic and structural properties of CoCrPt based perpendicular recording media required to achieve both high thermal stability and low-noise performance are discussed, based on experimental results obtained using a pulse magnetometer. Experimental and theoretical analysis reveal that for CoCrPt based media of 20nm thickness having the thermal stability factor KuV/(kT)≈80, the maximum achievable value of the ratio of remanence coercivity to anisotropy field of grains, Hr/Hk is ∼0.35. Furthermore, in order to realize a large squareness Mr/Ms of nearly 1.0, which is required to resist the thermal agitation effect at low recording density, we find that the value of perpendicular magnetocrystalline anisotropy, Ku needed to be more than three times larger than 2πMs2. X-ray diffraction patterns suggested that the suppression of structural imperfections in the HCP structure, particularly in the initial growth layer, is the key issue to induce larger Ku value in the CoCrPt based media.

Original languageEnglish
Pages (from-to)273-280
Number of pages8
JournalJournal of Magnetism and Magnetic Materials
Issue number1-3
Publication statusPublished - 2001 Oct
EventProceedings of the 5th Perpendicular Magnetic Recording Conference (PMRC 2000) - Sendai, Japan
Duration: 2000 Oct 232000 Oct 26


  • CoCr-based alloys
  • Magnetic anisotropy
  • Perpendicular recording media
  • Pulse magnetometer
  • Remanence coercivity
  • Thermal stability


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