Magnetic head for hard disk drive having varied composition nickel-iron alloy magnetic poles
AssigneeInternational Business Machines Corporation
InventorsThomas Edward Dinan, Neil Leslie Robertson, Alan Jun-Yuan Tam
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Abstract
A magnetic head for a hard disk drive. The magnetic poles of the head are formed with a NiFe alloy having a graduated composition in which a higher Fe concentration is fabricated proximate the write gap layer between the magnetic poles. Each magnetic pole is fabricated in a single electroplating step in which the duty cycle of the electroplating current is altered during the electroplating operation. Where the duty cycle is greatest the Fe ion concentration is likewise greatest.
Claims19
A magnetic head including a write head, comprising:
- a first (P1) magnetic pole;
- a second (P2) magnetic pole;
- a write gap layer being disposed between said P1 magnetic pole and said P2 magnetic pole;
- at least one of said P1 magnetic pole and said P2 magnetic pole being composed of a NiFe ion composition, and wherein the ratio of Ni to Fe is graduated throughout portions of either of said P1 magnetic pole and said P2 magnetic pole.
A magnetic head including a write head, comprising:
- a first (P1) magnetic pole being composed of a NiFe composition, wherein the ratio of Ni to Fe is graduated throughout portions of said P1 magnetic pole;
- a second (P2) magnetic pole being composed of a NiFe composition, and wherein the ratio of Ni to Fe is graduated throughout portions of said P2 magnetic pole;
- a write gap layer being disposed between said P1 magnetic pole and said P2 magnetic pole.
A hard disk drive including a magnetic head that includes a write head, comprising:
- a first (P1) magnetic pole being composed of a NiFe composition, wherein the ratio of Ni to Fe is graduated throughout portions of said P1 magnetic pole;
- a second (P2) magnetic pole being composed of a NiFe composition, and wherein the ratio of Ni to Fe is graduated throughout portions of said P2 magnetic pole;
- a write gap layer being disposed between said P1 magnetic pole and said P2 magnetic pole.
A method for fabricating a write head portion of a magnetic head, comprising the steps of:
- fabricating a P1 magnetic pole by electroplating NiFe material, wherein the duty cycle of an electroplating current is varied during the electroplating process to form a P1 magnetic pole having a graduated NiFe composition;
- fabricating a write gap layer upon said P1 magnetic pole;
- fabricating a P2 magnetic pole upon said write gap layer by electroplating NiFe material, and wherein the duty cycle of the electroplating current that is utilized in said electroplating process is varied to form a P2 magnetic pole having a graduated NiFe concentration.
Dependencies are inferred from the claim text.