The Thickness Dependence of Soft Magnetic Properties of (FeCo)-Al Alloy Thin Films

A systematic study of the film-thickness dependence of soft magnetic properties and magnetization dynamics of Fe 73 Co 25 Al 2 alloy thin films has been carried out. These films have columnar structures grown along the film normal, with the average width of the columns of about 30 nm. The saturation...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2017-11, Vol.53 (11), p.1-4
Main Authors: Ariake, Yusuke, Kanada, Isao, Mewes, Tim, Mankey, Gary, Tanaka, Yoshitomo, Shuang Wu, Mewes, Claudia, Suzuki, Takao
Format: Article
Language:English
Subjects:
Coercivity
Columns (structural)
Damping
FeCoAl thin films
Ferromagnetic resonance
Ferromagnetism
Film thickness
Fused silica
high saturation magnetization
Iron
low damping parameter
Magnetic properties
Magnetic resonance
Magnetic saturation
Magnetism
Magnetization
Silicon compounds
Silicon dioxide
soft magnetic thin films
Substrates
Thin films
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Summary:A systematic study of the film-thickness dependence of soft magnetic properties and magnetization dynamics of Fe 73 Co 25 Al 2 alloy thin films has been carried out. These films have columnar structures grown along the film normal, with the average width of the columns of about 30 nm. The saturation magnetization M s is about 1550 emu/cc, which remains nearly unchanged with film thickness over a range from 10 to 120 nm. The coercivity H c is found to increase with film thickness from 15 to 64 Oe over a range of 11 to about 50 nm, and then slightly decrease with further increase of thickness. The effective damping parameter α eff measured by ferromagnetic resonance over a frequency range from 12 to 66 GHz is found to decrease with film thickness, becoming 0.0004 and 0.0006, for the films deposited onto fused silica and MgO (100) substrate, respectively.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2017.2700320