Thermal agitation of magnetization in CoCrPt perpendicular recording media

T. Shimatsu, H. Uwazumi, Y. Sakai, A. Otsuki, I. Watanabe, H. Muraoka, Y. Nakamura

Research output: Contribution to journalConference articlepeer-review

13 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 20 nm 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, if the strictest condition of demagnetizing factor, 4π, for perpendicular media is assumed, in order to realize a large squareness Mr/Ms of nearly 1.0, which is required to resist the thermal agitation effect, we find that the value of perpendicular magnetocrystalline anisotropy, Ku, has to be more than 3 times larger than 2πM82.

Original languageEnglish
Pages (from-to)1567-1569
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number4 I
Publication statusPublished - 2001 Jul
Event8th Joint Magnetism and Magnetic Materials -International Magnetic Conference- (MMM-Intermag) - San Antonio, TX, United States
Duration: 2001 Jan 72001 Jan 11


  • Intergranular exchange coupling
  • Low media noise
  • Perpendicular recording media
  • Pulse magnetometer
  • Remanence coercivity
  • Thermal agitation


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