Magnetic film composed of a first alloy film including iron and platinum or iron and palladium
AssigneeFujitsu Limited
InventorKenji Noma
Life of this patent
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Abstract
In the magnetic film, projection of a magnetic pole, which is caused when a magnetic head is heated, can be restrained. The magnetic film can be applied to a magnetic head of a hard disk drive unit capable of recording data with high recording density. The magnetic film comprises: a first alloy film made of an alloy of iron (Fe) and platinum (Pt), or an alloy of iron (Fe), platinum (Pt) and other metal or metals; and a second alloy film directly layered on the first alloy film, the second alloy film made of an alloy of at least two metals selected from a group including iron (Fe), nickel (Ni) and cobalt (Co). Molar content of iron (Fe) in the first alloy film is 63-74%.
Claims11
A single magnetic pole of a magnetic head comprising a magnetic film,
- the magnetic film comprising:
- a first alloy film being made of an alloy of iron (Fe) and platinum (Pt), or an alloy of iron (Fe), platinum (Pt) and other metal or metals;
- and
- a second alloy film being made of an alloy of at least two metals selected from a group including iron (Fe), nickel (Ni) and cobalt (Co),
- wherein molar content of iron (Fe) in said first alloy film is 63-74%, the saturation magnetization of said second alloy film is 2.0 T or more, and
- the coefficient of linear thermal expansion (ΔL/L) of the first alloy film is approximately 0.
A single magnetic pole of a magnetic head comprising a magnetic film, the magnetic film comprising:
- a first alloy film being made of an alloy of iron (Fe) and palladium (Pd), or an alloy of iron (Fe), palladium (Pd) and other metal or metals;
- and
- a second alloy film made of an alloy of at least two metals selected from a group including iron (Fe), nickel (Ni) and cobalt (Co),
- wherein molar content of iron (Fe) in said first alloy film is 62-70%, the saturation magnetization of said second alloy film is 2.0 T or more, and
- the coefficient of linear thermal expansion (ΔL/L) of the first alloy film is approximately 0.
Dependencies are inferred from the claim text.