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Microwave Frequency Performance and High Magnetic Anisotropy of {\rm Fe}_{70}{\rm Co}_{30}-{\rm B} Films Prepared by a Modified Composition Gradient Sputtering

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11 Author(s)
Shandong Li ; Coll. of Phys. Sci., Qingdao Univ., Qingdao, China ; Lili Wang ; Jie Xu ; Zeng Wang
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A composition gradient sputtering (CGS) method, in which the doping elements have a gradient distribution from one side to another of the sample, was proposed in our previous work [Li SD, Appl. Phys. Lett., 92 (2008) 092501]. An ultra high magnetic anisotropy field over 500 Oe and ferromagnetic frequency over 7 GHz were obtained in as-deposited FeCoHf films by CGS method due to the stress-induced uniaxial magnetic anisotropy. However, the magnetic properties of the CGS samples are non-uniform, showing a location dependence. In this paper, a modified CGS (MCGS) method was proposed to improve the original CGS method. It is revealed that the MCGS method dramatically improves the uniformity of the high-frequency soft magnetic properties of the as-deposited Fe70Co30-B films. A narrow ferromagnetic resonance frequency (fFMR) range around 5.5 GHz (5.2-5.7 GHz) with a deviation less than 10% and high uniaxial magnetic anisotropy field up to 330 Oe were obtained for as-deposited films with 75 mm in length. As Comparison, the fFMR of the CGS samples is very inhomogeneous and distribute in a broad range from 3.1 to 6.7 GHz with a large deviation as high as 116%. The evident advantages of MCGS samples, such as high UMA and relatively uniform high-frequency characteristics, suggest that the MCGS Fe70Co30-B films are particularly in favor of the integration between magnetic films and RF/microwave components.

Published in:

Magnetics, IEEE Transactions on  (Volume:48 ,  Issue: 11 )

Date of Publication:

Nov. 2012

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