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Microstructure and magnetic properties of FePt and FePt–Al 2 O 3 thin films fabricated by in situ ordering process
Author(s) -
Cao J.,
Yang Z.,
Katayama N.,
Matsumoto M.,
Morisako A.,
Liu X.,
Takei S.
Publication year - 2005
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200420035
Subject(s) - microstructure , materials science , thin film , substrate (aquarium) , phase (matter) , grain size , in situ , crystallography , chemical engineering , nanotechnology , metallurgy , chemistry , oceanography , organic chemistry , geology , engineering
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)