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In-plane magnetic anisotropy induced in spin-sprayed Ni-Zn-Co ferrite films exhibiting strong magnetic loss at gigahertz range

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3 Author(s)
Matsushita, Nobuhiro ; Tokyo Inst. of Technol., Japan ; Nakamura, Tatsuro ; Abe, Masanori

Ni-Zn(-Co) ferrite films of 0.5-0.6 μm in thickness were deposited on glass substrates by the spin-sprayed ferrite plating at as low as 90°C applying external magnetic field of 50 Oe. Under no bias field, while the film without Co substitution (Ni0.21Zn0.27Fe2.52O4) exhibited a relatively high coercivity Hc of about 27 Oe, it decreased to 15 Oe for Co substituted film (Ni0.21Zn0.27Co0.04Fe2.48O4), and a slight uniaxial anisotropy was induced along the liquid flow direction of sprayed solutions. The decrease in Hc was attributed to the anisotropy compensation originated by Fe2+ and Co2+. Under bias field of 50 Oe, a definite in-plane magnetic anisotropy was induced in the Co substituted film. The imaginary permeability μ'' was greater than 20 over a wide frequency range from 300 MHz to 3 GHz. Since the product of μ''×f, which is proportional to the absorption of conducted noise, increased even in gigahertz range reaching the peak at 1.7 GHz, Ni-Zn-Co ferrite films with in-plane uniaxial anisotropy are applicable as shielding materials for suppressing electromagnetic interference in gigahertz range.

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Magnetics, IEEE Transactions on  (Volume:39 ,  Issue: 5 )