A study of the magnetic properties and high-frequency characteristics of Fe–Co/FeCoB-based bilayer films
A study of the magnetic properties and high-frequency characteristics of Fe–Co/FeCoB-based bilayer films
复制标题
DOI：
10.1088/0031-8949/2010/t139/014031
复制
发表时间：
2010-05
期刊：
影响因子：
2.9
通讯作者：
C. Hsieh;H. Chang;C. W. Chang;W. Chang;C. C. Yang-C.
中科院分区：
文献类型：
--
作者：
C. Hsieh;H. Chang;C. W. Chang;W. Chang;C. C. Yang-C.
The magnetic properties and high-frequency characteristics of sputtered Fe–Co/FeCoB-based bilayer films have been studied. For the Fe55 Co45 top layer sputtered on 180 nm (Fe0.55 Co0.45)90 B10 films, with increasing the thickness t of the top layer from 0 to 40 nm, the magnetic amisotropy field, (Hk) is improved from 330 to 367 Oe, whereas the saturation magnetization (4πMs) is increased from 17.2 to 17.9 kG. On the other hand, for films with Fe65 Co35 as the top layer, the 4πMs of the bilayer film is enhanced by 4.1% for t=40 nm, while Hk is increased to 349 Oe for t=10 nm at first and is decreased to 333 Oe for t=40 nm. Furthermore, the Hc of the bilayer films could be reduced by doping Ti and Nb in the (Fe0.55 Co0.45)90 B10 layer. In this study, the Fe65 Co35 (20 nm)/(Fe0.55 Co0.45)90 B6 Ti2 Nb2 (180 nm) bilayer film shows the optimum properties of 4πMs =16.4 kG, Hce =14.8 Oe, Hch =12.6 Oe, Hk =197 Oe, ρ=217 μΩ cm and fFRM, cal.=5.1 GHz. The permeability of the film is as large as 180 in the frequency range of 1–3 GHz.
