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Microwave, magnetic, and structural properties of nanocrystalline exchange-coupled Ni11Co11Fe66Zr7B4Cu1 films for high frequency applications

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10 Author(s)
Yoon, S.D. ; Center for Microwave Magnetic Materials and Integrated Circuits, Northeastern University, Boston, Massachusetts 02115, USA ; Baraskar, A.K. ; Geiler, A. ; Yang, A.
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Nanocrystalline structured films of the alloy Ni11Co11Fe66Zr7B4Cu1 were deposited by pulsed laser ablation deposition onto fused quartz substrates. A substrate temperature of 300 °C was found to produce films consisting of body-centered-cubic (bcc) metallic grains suspended in an amorphous matrix. The bcc grain size ranged from 5–8 nm for substrate temperatures up to 300 °C. Measured values of coercivity were consistently below 4 Oe for films having a saturation magnetization, as 4πMS, of ∼16 kG with in-plane uniaxial anisotropy fields of 25 to 30 Oe. The ferromagnetic resonance peak-to-peak derivative linewidth was measured to be 34 Oe at a frequency of 9.61 GHz. The zero magnetic field ferromagnetic resonance occurred at ∼2 GHz. These films exhibit soft magnetic properties, high saturation induction, low microwave loss, and the structural stability desirable for thin film inductor applications.

Published in:

Journal of Applied Physics  (Volume:103 ,  Issue: 6 )