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AssigneeNEC Corporation
InventorsMikiko Saito, Nobuyuki Ishiwata, Tsutomu Ishi, Hiroaki Honjo, Tamaki Toba, Shinsaku Saito, Yoshihiro Nonaka
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A magnetic material includes a main component expressed by a general formula CoNiFeX, wherein X is at least one element selected from the group consisting of Cr, Ti, V, Ru, Rh, Pd, Os, Ir and Pt, and wherein weight percentages a, b, c and d of Co, Ni, Fe and X contents, respectively, in the main component are such that 40%≦a≦10%, 5%≦b≦20%, 10%≦c≦30%, and 0%<d≦10%.
A magnetic material comprising a main component thereof expressed by a general formula CoNiFeX, wherein X is at least one element selected from the group consisting of Cr, Ti, V, Ru, Rh, Pd, Os, Ir and Pt, and wherein weight percentages a, b, c and d of Co, Ni, Fe and X contents, respectively, in said main component are such that 40%≦a≦10%, 5%≦b≦20%, 10%≦c≦30%, and 0%<d≦10%.
A magnetic head comprising a recording head including first and second magnetic cores sandwiching therebetween a recording gap, and a writing coil for generating a magnetic flux in said first and second magnetic cores and a writing magnetic field in said recording gap, said second magnetic core including a first magnetic layer made of a first magnetic material and a second magnetic layer formed on said first magnetic layer, said first magnetic material including a main component thereof expressed by a general formula CoNiFeX, wherein X is at least one element selected from the group consisting of Cr, Ti, V, Ru, Rh, Pd, Os, Ir and Pt, and wherein weight percentages a, b, c and d of Co, Ni, Fe and X contents, respectively, in said main component are such that 40%≦a≦10%, 5%≦b≦20%, 10% ≦c≦30%, and 0%<d≦10%.
Dependencies are inferred from the claim text.
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Alloys containing less than 50% by weight of each constituent
Nanomagnetism
Using thin films: details
Thin magnetic films, e.g. of one-domain structure: ultrathin or granular films
Term end not estimated
(a) Field of the Invention
The present invention relates to a magnetic material having a high saturation magnetic flux density and a low coercive force and suited for use in a recording magnetic core, and a magnetic head having a magnetic core including the magnetic material.
(b) Description of a Related Art
FIG. 1 is a graph showing the crystal structure of the three-component plating CoNiFe film without addition of saccharin.
FIG. 2 is a graph showing the crystal structure of the three-component plating CoNiFe film with saccharin addition.
FIG. 3 is a sectional view of a magnetic head according to an embodiment of the present invention.
Now, the present invention is more specifically described with reference to preferred embodiments thereof.
A magnetic material according to a first embodiment of the present invention includes CoNiFeX as a main component thereof wherein X is at least one substance selected from the group consisting of Cr, Ti, V, Ru, Rh, Pd, Os, Ir and Pt, and wherein the weight percentages a, b, c and d of Co, Ni, Fe and X contents, respectively, are such that 40%≦a≦75%, 5%≦b≦20%, 10%≦c≦30%, and 0%<d≦10%.
In a sample of the magnetic material of the present embodiment, the crystal structure of CoNiFe was controlled by using an additive such as Cr added in a small-grain-size area, which resided in the mixed crystal area or in a fcc area in the vicinity of the mixed crystal area. The resultant crystal of CoNiFe exhibited a peak intensity ratio of fcc(200)/fcc(111) which is below 0.25 in an X-ray diffraction, and exhibited a low coercive force, a low magnetic distortion constant and a high saturation magnetic flux density of around 2 tesla in the area wherein the peak intensity of the bcc(110) is 0.1 to 1.0 times the peak intensity of the fcc(111).