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Magnetic properties and high-frequency characteristics of FeCoAlO gradient composition thin films

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8 Author(s)
Zheng, Fu ; Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China ; Luo, Feilong ; Lou, Yuanfu ; Wang, Ying
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5 × 25 mm 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 Hc of 4 – 8 Oe. The saturation magnetization 4πMs 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 and G (G and G are parallel and perpendicular to the direction of the Al-O composition gradient, respectively). In both of G & G directions, the sample 1 showed a resonance frequency (fr) of around 2.6 – 3.0 GHz, while, in G direction, it showed a high value of real permeability μ′. 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.

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Journal of Applied Physics  (Volume:111 ,  Issue: 7 )