科研之友
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摘要
5 x 25mm FeCoAlO gradient composition thin film was prepared with composite target by using RF magnetron sputtering. The Al-O composition gradient along the length direction of the film was introduced by Al2O3 chips asymmetrically arrayed on a Fe70Co30 target disk. The film was divided into five equal segments. All samples showed a low coercive force H-c of 4 - 8 Oe. The saturation magnetization 4 pi M-s increased continuously from 17.3 kGs for sample 1 (has more Al-O content) to 19.7 kGs for sample 5 and it was consistent with the increasing of Fe-Co composition. Meanwhile, these samples showed different anisotropy behaviors relating with Al-O composition. The sample 1 exhibited the same magnetization curve along the directions of G(parallel to) and G(perpendicular to) (G(parallel to) and G(perpendicular to) are parallel and perpendicular to the direction of the Al-O composition gradient, respectively). In both of G(parallel to) & G(perpendicular to) directions, the sample 1 showed a resonance frequency (f(r)) of around 2.6 - 3.0 GHz, while, in G(parallel to) direction, it showed a high value of real permeability mu'. The sample 5 exhibited a distinct in-plane uniaxial anisotropy and a good high-frequency response of 3.0 GHz resonance frequency. So these films having gradient composition exhibit are suggested for the use in integrated magnetic devices working in the GHz frequency range.
