Effects of Carbon Content on Magnetic and Microwave Properties of Iron Gallium Carbon Thin Films

ORAL

Abstract

A systematic investigation of the soft magnetism, delta E effect, magnetostriction, and microwave properties has been carried out on iron gallium carbon (Fe-Ga-C) thin films over a wide carbon content range. The phase transformation of the Fe-Ga-C films from bcc polycrystalline to amorphous phase leads to excellent magnetic softness with a low coercivity of less than 1 Oe, high 4pMs, narrow ferromagnetic resonance (FMR) linewidth at 10 GHz of 20~30 Oe and ultra-low Gilbert damping constant of 0.0027. A record high piezomagnetic coefficient of 9.71 ppm/Oe, high saturation magnetostriction constant of 81.2 ppm, and large delta E effect of -120 GPa at 500 nm are also achieved. The soft magnetism, large delta E effect and piezomagnetic coefficient combined with ultra-low Gilbert damping constant make Fe-Ga-C thin film an attractive alloy for magnetoelectric and other voltage tunable RF/microwave device applications.

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Presenters

  • Xianfeng Liang

    Electrical and Computer Engineering, Northeastern University, College of Engineeing, Northeastern University, Northeastern University

Authors

  • Xianfeng Liang

    Electrical and Computer Engineering, Northeastern University, College of Engineeing, Northeastern University, Northeastern University

  • Cunzheng Dong

    Electrical and Computer Engineering, Northeastern University, Northeastern University

  • Nian Xiang Sun

    Electrical and Computer Engineering, Northeastern University, College of Engineeing, Northeastern University, Northeastern University, Electrical Engineering, Northeastern University, Department of Electrical and Computer Engineering, Northeastern University