Thermal stability in magneto-optical recording media: Analysis of magnetization decay

R. Sbiaa*, M. Mochida, Y. Itoh, T. Suzuki

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


Thermal stability of amorphous TbFeCo monolayers and {TbFeCo/Pt} multilayers is studied by magnetic viscosity measurements M(t). Using, isothermal remanence measurements the relationship between the magnetization reversal process and its time dependence has been investigated. The non-linear evolution of magnetization with In(time) happens when the mechanism responsible for magnetization reversal process is mainly domain nucleation. On the other hand domain wall motion process induces a linear M(t) behavior. For multilayers with very small Pt thickness (samples with high square hysteresis loop), magnetization time decay can be described easily by a single energy barrier EB model. As Pt thickness increases, distribution of EB becomes wider leading to almost linear magnetization decay with In(time) as in longitudinal recording media. The activation volume is determined for these media and shows a strong correlation with reversing field, thus yielding variations of stability over a written bit.

Original languageEnglish
Pages (from-to)72-75
Number of pages4
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2001
Externally publishedYes
Event5th International Symposium on Optical Storage (ISOS 2000) - Shanghai, China
Duration: May 22 2000May 26 2000


  • Activation volume
  • Demagnetizing measurements
  • Energy barrier
  • Thermal stability
  • Viscosity measurements

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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