Microstructure and microwave permeability of FeCo thin films with Co underlayer |
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Authors: | YP Wu Gu-Chang Han |
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Institution: | a Temasek Laboratories, National University of Singapore, 5A Engineering Drive 1, #09-02, Singapore 117411 b Data Storage Institute, Agency for Science, Technology and Research (A?STAR), 5 Engineering Drive 1, Singapore 117608 |
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Abstract: | Microstructure, static magnetic properties and microwave permeability of sputtered FeCo films were examined. Fe60Co40 films (100 nm in thickness) deposited on glass substrates exhibited in-plane isotropy and a large coercivity of 161.1 Oe. When same thickness films were deposited on 2.5 nm Co underlayer, well-defined in-plane anisotropy was formed with an anisotropy field of 65 Oe. The sample had a static initial permeability of about 285, maximum imaginary permeability of 1255 and ferromagnetic resonance frequency of 2.71 GHz. Cross-sectional TEM image revealed that the Co underlayer had induced a columnar grain structure with grain diameter of 10 nm in the FeCo films. In comparison, FeCo films without Co underlayer showed larger grains of 70 nm in diameter with fewer distinct vertical grain boundaries. In addition, the Co underlayer changed the preferred orientation of the FeCo from (1 0 0) to (1 1 0). The improvement in soft magnetic properties and microwave behavior originates from the modification of the film microstructure, which can be well understood by the random anisotropy theory. |
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Keywords: | Ferromagnetic thin film High-frequency permeability FeCo film Co underlayer |
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