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Efficient Approach to Measure Crystallization Temperature in Amorphous Thin Film by Infrared Reflectivity

  • Wang, Wenxiu (Department of Electronic Engineering, Graduate School of Engineering, Tohoku University) ;
  • Saito, Shin (Department of Electronic Engineering, Graduate School of Engineering, Tohoku University) ;
  • Yakabe, Hidetaka (Metallurgical Research Laboratory, Hitachi Metals, Ltd.) ;
  • Takahashi, Migaku (New Industry Creation Hatchery Center, Tohoku University)
  • Received : 2012.10.18
  • Accepted : 2013.05.09
  • Published : 2013.06.30

Abstract

This paper shows a new effective approach to measure crystallization temperature of soft magnetic underlayer (SUL) for next generation of heat assisted perpendicular recording media. This approach uses temperature dependent reflectivity, which shows a clear jump when samples are crystallized. To achieve this measurement, an optical system is set up using hot plate and infrared laser. Reflectivity of SUL $(Co_{70}Fe_{30})_{92}Ta_3Zr_5$ shows a clear jump at its amorphous-crystalline transition temperature. Experiment results show this effect is clear in infrared region, and is weak for visible light.

Keywords

Amorphous thin film;Soft magnetic thin film;Optical property;Perpendicular recording media

References

  1. Migaku Takahashi and Shin Saito, J. Magn. Magn. Mater. 320, 2868 (2008). https://doi.org/10.1016/j.jmmm.2008.07.039
  2. M. Kevin Mior and Timothy J. Klemmer, J. Appl. Phys. 93, 6465 (2003). https://doi.org/10.1063/1.1557346
  3. Stanford R. Ovshisky, Phys. Rev. Lett. 21, 1450 (1968). https://doi.org/10.1103/PhysRevLett.21.1450
  4. J. Siegel, A. Schropp, J. Solis, C. N. Afonso, and M. Wuttig, Appl. Phys. Lett. 84, 2250 (2004). https://doi.org/10.1063/1.1689756
  5. P. Haussler, F. Baumann, J. Krieg, G. Indlekofer, P. Oelhafen, and H.-J. Guntherodt, Phys. Rev. Lett. 51, 714 (1983). https://doi.org/10.1103/PhysRevLett.51.714
  6. S. S. Jaswal and J. Hafner, Phys. Rev. B 38, 7311 (1988). https://doi.org/10.1103/PhysRevB.38.7311