Magnetic head for perpendicular magnetic recording, head gimbal assembly, head arm assembly and magnetic disk drive

A pole layer incorporate a track width defining and a wide portion. A material forming the pole layer is an alloy whose major elements are iron and nickel. In the alloy, where the proportions of iron and nickel with respect to the total of iron and nickel are indicated as (100-M) weight % and M weig...

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Bibliographic Details
Main Authors NOGUCHI KIYOSHI, HIRATA KEI, YAMAGUCHI ATSUSHI, ROPPONGI TETSUYA
Format Patent
LanguageEnglish
Published 11.05.2006
Subjects
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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Summary:A pole layer incorporate a track width defining and a wide portion. A material forming the pole layer is an alloy whose major elements are iron and nickel. In the alloy, where the proportions of iron and nickel with respect to the total of iron and nickel are indicated as (100-M) weight % and M weight %, respectively, M is greater than 0 and smaller than or equal to 10. The internal stress of the pole layer is a tensile stress. The magnetostriction constant of the material forming the pole layer is positive. Where the anisotropy field of the pole layer is Hk (A/m), the magnetostriction constant of the material forming the pole layer is lambda(x10-6), and the internal stress of the pole layer is sigma (MPa), the value of Hk/(lambdaxsigma) is greater than 0.01 and smaller than 0.2.
Bibliography:Application Number: US20050266289