(001) oriented FePt–Ag composite nanogranular films on amorphous substrate

Kang, K.; Zhang, Z. G.; Papusoi, C.; Suzuki, T.
May 2003
Applied Physics Letters;5/12/2003, Vol. 82 Issue 19, p3284
Academic Journal
By annealing the multilayer film with a stack structure of MgO 10 nm/Ag 20 nm/[FePt x nm/Ag 5 nm][SUB5] at 550°C for 1 h, (001)-oriented L 1[SUB0] FePt nanograins with high perpendicular magnetic anisotropy are obtained on an amorphous substrate. The 20-nm Ag underlayer plays an important role in improving (001) texture of FePt and decreasing the fct FePt ordering temperature. The switching volume and uniaxial magnetic anisotropy constant K[SUBu] of FePt-Ag composite films with a controllable FePt grain size are obtained by fitting the coercivity dependence on magnetic field sweeping rate employing coherent rotation model, taking into account the easy axis distribution.


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