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- W1942521627 abstract "Fabrication of a Fe-Co thin film with both high magnetic resonant frequency and large permeability for high-frequency device applications is a challenge despite Fe-Co's high magnetization. Limitations are usually due to relatively high coercivity or low anisotropy. Here, we demonstrate a method for fabrication of Fe-Co films with both ultrahigh resonant frequency and large permeability, obtained by slightly tuning their nanostructures and reducing their crystal defects during electrodeposition. With a change from a single direct current density to two well-controlled alternating current densities during deposition, the as-synthesized films (200-600 nm in thickness) have significantly lower coercivity (down to 8 Oe) and improved anisotropy (up to 96 Oe) and magnetic polarization (up to 2.4 T), which lead to an ultrahigh resonant frequency up to 5.1 GHz. Further reduction of the crystal defects and improvement in Fe-Co atom-filling density through the optimization of the plating solution at lower temperatures and higher concentrations result in resonant frequency and relative permeability improvements up to 6.1 GHz and 325 (real part), respectively. Further, Fe-Co films with only large relative permeability (up to 715) can also be attained through optimization. These nanofilms thus have the potential to be used in gigahertz microwave devices." @default.
- W1942521627 created "2016-06-24" @default.
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- W1942521627 date "2015-01-01" @default.
- W1942521627 modified "2023-09-25" @default.
- W1942521627 title "Growth Method to Improve the Resonant Frequency and Magnetic Permeability of FeCo Thin Films" @default.
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- W1942521627 doi "https://doi.org/10.1109/lmag.2015.2480385" @default.
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