Structure and magnetic properties of FePt (001) graded films deposited on glass substrates
Resource
Journal of Applied Physics, 111(7), 07B715
Journal
Journal of Applied Physics
Pages
07B715
Date Issued
2012
Date
2012
Author(s)
Yuan, Fu-Te
Lin, Yi-Hung
Mei, J.K.
Hsu, Jen-Hwa
Kuo, P.C.
Abstract
This study examines L10 FePt (001) hard magnetic films that were coated with a layer having graded perpendicular magnetic constant (Ku) and with a disordered FePt soft layer on glass substrates. The 5 nm-thick hard layer exhibits a clear (001) texture, large perpendicular magnetic anisotropy (PMA), and an island-like morphology with particle size of 15–25 nm. The deposition of the graded or soft layer with a thickness of 5–15 nm does not change the particle size. The graded and hard/soft samples both exhibit reduced out-of-plane coercivity (Hc⊥) but their reversal behaviors differ. Strong exchange coupling appears between the hard and graded layers, maintaining high PMA. However, hard/soft films exhibit weak coupling such that the film becomes in-plane anisotropic when the thickness of the soft layer exceeds 5 nm. The investigations of magnetic domain structures further reveal different magnetic coupling configurations between different types of films. The results herein are consistent with theoretical predictions and are useful for future graded media design.
SDGs
Type
journal article
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