Ferrite thin film, method of manufacturing the same and electromagnetic noise suppressor using the same
AssigneeNEC Tokin Corporation
InventorsKoichi Kondo, Okikuni Takahata, Tatsuya Chiba, Hiroshi Ono, Shigeyoshi Yoshida, Masanori Abe, Masahiro Yamaguchi
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Abstract
An electromagnetic noise suppressor including a ferrite film is formed by regularly arranging constituents such as magnetized grains or one analogous to that. In the ferrite film, the constituents have at least one of the uniaxial anisotropy and the multiaxial anisotropy. The ferrite film has the magnetic anisotropy or the magnetic isotropy. The ferrite film is formed by a plating method in the presence of a magnetic field.
Claims24
An electromagnetic noise suppressor, comprising a ferrite film in which magnetized grains are regularly arranged,
- wherein the ferrite film has magnetic anisotropy or is magnetically isotropic;
- has a ratio of peak in intensities corresponding to a (222) crystal lattice plane and a (311) crystal lattice plane in an X-ray diffraction pattern of a surface of the film, I222/I311, said ratio being larger than 0.05;
- is composed of at least one of Ni, Zn, Fe, and O and contains Co in a molar ratio of Co/(Fe+Ni+Zn+Co) of 0.01/3 to 0.3/3.
An electromagnetic noise suppressor, comprising a ferrite film consisting essentially of magnetized grains that are regularly arranged and wherein the ferrite film has magnetic anisotropy or is magnetically isotropic;
- has a ratio of peak in intensities corresponding to a (222) crystal lattice plane and a (311) crystal lattice plane in an X-ray diffraction pattern of a surface of the film, I222/I311, said ratio being larger than 0.05;
- and is composed of at least one of Ni, Zn, Fe and O.
Dependencies are inferred from the claim text.