Multilayered ferromagnetic film and magnetic head employing the same
AssigneeInternational Business Machines Corporation
InventorsRichard T. Campbell, Jyh-Shuey J. Lo
Life of this patent
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Abstract
A soft magnetic film includes a laminated structure having an alternating plurality of first magnetic and second magnetic film. The first magnetic films is of a predetermined thickness range and is made of a magnetic alloy of nickel, iron and nitrogen with the nitrogen present from greater than zero to 20 atomic percent. The second magnetic film is of a predetermined thickness range and is made of a magnetic alloy of iron and nitrogen with the nitrogen present from greater than zero to about 20 atomic percent. The films can be annealed in an applied magnetic field. The multilayer films have application as pole pieces and shields in magnetic heads. The magnetic heads are for use in dynamic storage systems including disk and tape media.
Claims32
A multilayered soft magnetic film structure comprising:
- a first magnetic film of a predetermined thickness, said first magnetic film being made of a magnetic alloy comprising nickel, iron and nitrogen;
- and
- a second magnetic film of a predetermined thickness, said second magnetic film being made of a magnetic material including iron and nitrogen;
- said first and second magnetic films being laminated to provide the multilayered film structure having an alternating plurality of said first magnetic films and said second magnetic films.
A magnetic head comprising:
- a substrate;
- a first magnetic pole piece deposited on said substrate;
- a magnetic insulating layer covering said first pole piece and forming a magnetic gap;
- a second magnetic pole piece deposited to create a magnetic circuit with said first pole piece;
- and
- conductor coils formed between said first and second magnetic pole pieces to activate said magnetic pole pieces;
- said first and second magnetic pole pieces each including multilayered soft magnetic films having alternating first and second film layers;
- said first magnetic film layer being of a predetermined thickness, and made of a magnetic alloy comprising nickel, iron and nitrogen;
- said second magnetic film layer being of a predetermined thickness, and made of a magnetic material including iron and nitrogen;
- and
- said first and second magnetic film layers being alternately laminated to provide a multilayered film structure.
A magnetic head comprising:
- a substrate;
- a first magnetic pole piece deposited on said substrate;
- a magnetic insulating layer covering said first pole piece and forming a magnetic gap;
- a second magnetic pole piece deposited to create a magnetic circuit with said first pole piece;
- and
- conductor coils formed between said first and second magnetic pole pieces to activate and sense said magnetic pole pieces;
- either said first or said second magnetic pole pieces including multilayered soft magnetic films having alternating first and second film layers;
- said first magnetic film layer being of a predetermined thickness, and made of a magnetic alloy comprising nickel, iron and nitrogen;
- said second magnetic film layer being of a predetermined thickness, and made of a magnetic material including iron and nitrogen;
- and
- said first and second magnetic film layers being alternately laminated to provide a multilayered film structure.
A magnetic head including at least one magnetoresistive (MR) element and at least one shield for the at least one MR element, wherein said shield includes a multilayered soft magnetic film comprising:
- a first magnetic film of a predetermined thickness, said first magnetic film being made of a magnetic alloy comprising nickel, iron and nitrogen;
- a second magnetic film of a predetermined thickness, said second magnetic film being made of a magnetic material including iron and nitrogen;
- and
- said first and second magnetic films being laminated to provide the multilayered film structure having an alternating plurality of said first magnetic films and said second magnetic films.
A magnetic head comprising:
- a substrate;
- a first magnetic pole piece deposited on said substrate;
- a magnetic insulating layer covering said first pole piece and forming a magnetic gap;
- a second magnetic pole piece deposited to create a magnetic circuit with said first pole piece;
- and
- conductor coils formed between said first and second magnetic pole pieces to activate said magnetic pole pieces;
- either said first or said second magnetic pole pieces including multilayered soft magnetic films having alternating first and second film layers;
- said second magnetic film layer being of a predetermined thickness, and made of a magnetic alloy comprising nickel, iron and nitrogen;
- said first magnetic film layer being of a predetermined thickness, and made of a magnetic material including iron and nitrogen;
- and
- said first and second magnetic film layers being alternately laminated to provide a multilayered film structure.
A method for making a multilayered soft magnetic film comprising:
- depositing a first magnetic film of a predetermined thickness in a magnetic field of greater than 10 Oersted, said first magnetic film being made of a magnetic alloy comprising nickel, iron and nitrogen;
- depositing a second magnetic film of a predetermined thickness in a magnetic field of greater than 10 Oersted, said second magnetic film being made of a magnetic material including iron and nitrogen;
- forming a film structure of said first and second magnetic films, said film structure including a laminated magnetic structure having alternating layers of a plurality of said first magnetic films and a plurality of said second magnetic films;
- and
- annealing said laminated magnetic structure in a magnetic field of greater than 10 Oersted at a temperature of from 100 to 300 degrees centigrade.
A thin film inductive transducer for recording magnetic transitions on a magnetic recording medium, said transducer being of the type comprising two layers of a magnetic material forming a yoke structure that is activated by a conductor coil, all deposited on a slider substrate and supported over the media, characterized in that at least one layer comprises a laminate of a plurality of first magnetic films of a predetermined thickness and made of a magnetic alloy of nickel, iron and nitrogen where nitrogen is present substantially within the range of from greater than 0 to 20 atomic percent, alternating with a plurality of second magnetic films of a predetermined thickness and made of an alloy of iron and nitrogen where nitrogen is present substantially within the range of from greater than 0 to 20 atomic percent.
A storage device comprising:
- a magnetic media;
- at least one transducer;
- means for supporting each of said at least one transducer in sensing position relative to said media;
- means for providing relative motion between said media and said transducer;
- said transducer operable to at least form magnetic transitions on said media;
- said transducer being of a type having two layers of a magnetic material forming a yoke structure that is activated by a conductor coil, all deposited on a substrate attached to said supporting means and characterized in that at least one layer includes a multilayered ferromagnetic film of a plurality of first magnetic films of a predetermined thickness and made of a magnetic alloy of nickel, iron and nitrogen where nitrogen is present substantially within the range of from greater than 0 to 20 atomic percent, alternating with a plurality of second magnetic films of a predetermined thickness and made of an alloy of iron and nitrogen where nitrogen is present substantially within the range of from greater than 0 to 20 atomic percent.
A storage device comprising:
- a magnetic media;
- at least one transducer;
- means for supporting each of said at least one transducer in sensing position relative to said media;
- means for providing relative motion between said media and said transducer;
- said transducer operable to at least read magnetic transitions from said media;
- said transducer being of a type having a magnetoresistive element deposited on a substrate attached to said supporting means and characterized in that at least one layer of said transducer includes a multilayered ferromagnetic film of a plurality of first magnetic films of a predetermined thickness and made of a magnetic alloy of nickel, iron and nitrogen where nitrogen is present substantially within the range of from greater than 0 to 20 atomic percent, alternating with a plurality of second magnetic films of a predetermined thickness and made of an alloy of iron and nitrogen where nitrogen is present substantially within the range of from greater than 0 to 20 atomic percent.
Dependencies are inferred from the claim text.