Microstructure and magnetic properties of FePt and FePt-Al2O3thin films fabricated by in situ ordering process

✍ Scribed by Cao, J. ;Yang, Z. ;Katayama, N. ;Matsumoto, M. ;Morisako, A. ;Liu, X. ;Takei, S.

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 350 KB
• Volume: 202
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200420035

✦ Synopsis

Abstract

The microstructure and magnetic properties of L1~0~ ordered Fe~55~Pt~45~ and (Fe~55~Pt~45~)~1–x~–(Al~2~O~3~)~x~ thin films fabricated by in situ ordering process were studied. For Fe~55~Pt~45~ thin films, preheating substrate above 250 °C induces a transformation from a disordered fcc structure to ordered L1~0~ phase and the films become magnetically hard. The addition of Al~2~O~3~ made fcc‐fct transformation temperature rise from 250 °C to 400 °C and the average grain size of thin films reduce from 20 nm to 6nm or less. The reason why the fcc‐fct phase transformation starts at lower substrate temperature can be well understood by the discussion of relationship between phase transformation and kinetic energy of sputtered atoms. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)