TY - JOUR
T1 - Cole-Cole Impedance Analysis on Spin Sprayed Ni-Zn-Co Ferrite Films Exhibiting Strong Magnetic Loss in Gigahertz Range
AU - Kondo, Koichi
AU - Chiba, Tatsuya
AU - Ando, Shinsuke
AU - Yoshida, Shigeyoshi
AU - Shimada, Yutaka
AU - Nakamura, Tatsuro
AU - Matsushita, Nobuhiro
AU - Abe, Masanori
N1 - Funding Information:
Manuscript received January 6, 2003. This work was supported in part by Grant-in-Aid for Development of Innovative Technology (GADIT) under Grant 13501, from Ministry of Education, Culture, Sports, Science, and Technology, Japan.
PY - 2003/9
Y1 - 2003/9
N2 - As the material for realizing gigahertz conducted noise suppressors, Ni-Zn-Co ferrite films (Ni0.15-0.21 Zn0.20-0.36Co xFe2.39-2.56O4 x = 0-0.10) were deposited from an aqueous solution by spin spray ferrite plating at 90 °C. We applied 1.3-kOe bias field parallel to the centrifugal direction of liquid flow on the substrate. The bias field and the Co addition induced an in-plane uniaxial anisotropy with easy axis parallel to the liquid flow (or bias field) direction. The effect was strongest at x = 0.03; the complex permeability (μ = μ′ - jμ″) along the hard axis exhibited a high-natural ferromagnetic resonance of fr = 1.4 GHz and a strong magnetic loss of μ″ > 30 in a wide range between 300 MHz and 3 GHz. Measured along the easy axis, however, μ′ and μ″ were negligibly small, indicating that the high permeability with strong loss was ascribed to magnetization rotation, with no contribution from domain motion. Cole-Cole impedance (0.1 Hz-1 MHz) plots for each Ni-Zn-Co ferrite film were fitted by a depressed semicircle, whose relaxation angle became largest at x = 0.03. This means that the relaxation time in conduction process is most widely dispersed at the same Co content where, as mentioned above, the magnetic loss became strong in a wide frequency range.
AB - As the material for realizing gigahertz conducted noise suppressors, Ni-Zn-Co ferrite films (Ni0.15-0.21 Zn0.20-0.36Co xFe2.39-2.56O4 x = 0-0.10) were deposited from an aqueous solution by spin spray ferrite plating at 90 °C. We applied 1.3-kOe bias field parallel to the centrifugal direction of liquid flow on the substrate. The bias field and the Co addition induced an in-plane uniaxial anisotropy with easy axis parallel to the liquid flow (or bias field) direction. The effect was strongest at x = 0.03; the complex permeability (μ = μ′ - jμ″) along the hard axis exhibited a high-natural ferromagnetic resonance of fr = 1.4 GHz and a strong magnetic loss of μ″ > 30 in a wide range between 300 MHz and 3 GHz. Measured along the easy axis, however, μ′ and μ″ were negligibly small, indicating that the high permeability with strong loss was ascribed to magnetization rotation, with no contribution from domain motion. Cole-Cole impedance (0.1 Hz-1 MHz) plots for each Ni-Zn-Co ferrite film were fitted by a depressed semicircle, whose relaxation angle became largest at x = 0.03. This means that the relaxation time in conduction process is most widely dispersed at the same Co content where, as mentioned above, the magnetic loss became strong in a wide frequency range.
KW - Cole-Cole impedance analysis
KW - Complex permeability
KW - Ferrite plating
KW - Ni-Zn-Co ferrite film
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U2 - 10.1109/TMAG.2003.816028
DO - 10.1109/TMAG.2003.816028
M3 - Article
AN - SCOPUS:0141952980
SN - 0018-9464
VL - 39
SP - 3130
EP - 3132
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
IS - 5 II
ER -