Abstract
FeCo films with various Fe/Co atomic ratios were deposited by electro-plating method. Microstructure, static magnetic properties and microwave permeability of as-deposited films were examined. FeCo films deposited from solution with an Fe <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> /Co <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> mole ratio of 0.7:1 exhibited almost in-plane isotropy and a large coercivity Hc of about 100 Oe. With the increase in Fe <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> /Co <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> ratio and ions concentration in plating solution, the deposited films showed lower coercivity and well-defined in-plane anisotropy. For the film deposited from solution with an Fe <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> /Co <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> mole ratio of 3:1 and total depositing ion ( Fe <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> and Co <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> ) concentration of 480 mmol/l, the ferromagnetic resonance frequency (f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">r</sub> ) corresponding to the maximum imaginary permeability (μ" <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">max</sub> ) is around 1 GHz, and the static initial permeability (μ' <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> ) is about 265. The formation of in-plane anisotropy and reduction of coercivity originates from the modification of the film microstructure and composition, which can be well understood by the random anisotropy theory. These soft FeCo films with in-plane anisotropy are promising for high-frequency applications in gigahertz due to their excellent microwave properties.
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