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

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 5–8nm for substrate temperatures up to 300°C. Measured values of coercivity were consistently below 4Oe for films having a saturation magnetization, as 4πMS, of ∼16kG with in-plane uniaxial anisotropy fields of 25to30Oe. The ferromagnetic resonance peak-to-peak derivative linewidth was measured to be 34Oe at a frequency of 9.61GHz. The zero magnetic field ferromagnetic resonance occurred at ∼2GHz. These films exhibit soft magnetic properties, high saturation induction, low microwave loss, and the structural stability desirable for thin film inductor applications.

[1]  S. Yoon,et al.  Pulsed laser ablation deposition of nanocrystalline exchange-coupled Ni11Co11Fe67−xZr7B4Cux (x=0,1) films for planar inductor applications , 2007 .

[2]  S. Yoon,et al.  Structure and magnetism of nanocrystalline exchange-coupled (Ni0.67Co0.25Fe0.08)89−xZr7B4Cux (x=0,1) films , 2006 .

[3]  R. Stroud,et al.  (Ni,Fe,Co)-based nanocrystalline soft magnets with near zero magnetostriction , 2002 .

[4]  V. Harris,et al.  Ferromagnetic resonance in nanocrystalline Fe73.5CuNb3Si13.5B9 (Finemet) , 2001 .

[5]  J. Cadogan,et al.  The effect of coherent uniaxial anisotropies on the grain-size dependence of coercivity in nanocrystalline soft magnetic alloys , 1998 .

[6]  C. Vittoria,et al.  Ferromagnetic resonance of micrometer-sized samples , 1997 .

[7]  J. Cadogan,et al.  Time‐temperature‐transformation study of a nanocrystalline Fe91Zr7B2 soft magnetic alloy , 1996 .

[8]  H. Hoffmann,et al.  The wall coercivity of soft magnetic films , 1993 .

[9]  G. Herzer,et al.  Grain size dependence of coercivity and permeability in nanocrystalline ferromagnets , 1990, International Conference on Magnetics.

[10]  Y. Yoshizawa,et al.  New Fe-based soft magnetic alloys composed of ultrafine grain structure , 1988 .

[11]  R. O'handley,et al.  Ferromagnetic properties of some new metallic glasses , 1976 .

[12]  E. Schlömann,et al.  Ferromagnetic Resonance in Polycrystalline Nickel Ferrite Aluminate , 1958 .

[13]  B. Cullity,et al.  Elements of X-ray diffraction , 1957 .