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US 7,372,665 B1Granted
Magnetic recording head with resistive heating element located near the write coil
AssigneeWestern Digital (Fremont), LLC
InventorsKroum S. Stoev, Suping Song, Tao Pan
Life of this patent
Estimating the term…
Abstract
A magnetic head includes a slider body having a trailing surface meeting an air-bearing surface at a trailing edge, with a thin-film transducer disposed on the trailing surface of the slider body near the trailing edge. The thin-film transducer includes a coil embedded between first and second poles. A resistive heating element is disposed adjacent and electrically insulated from, the coil. Application of power to the resistive heating element causes expansion of at least the first and second poles.
Claims80
A magnetic head comprising:
- a slider body having a trailing surface meeting an air-bearing surface at a trailing edge;
- a thin-film transducer disposed on the trailing surface near the trailing edge, the thin-film transducer including a coil embedded between first and second poles, the coil having a first set of turns disposed in a first general plane and a second set of turns disposed in a second general plane;
- and
- a resistive heating element, at least a portion of the resistive heating element being disposed between, and electrically insulated from, the first set and second set of turns of the coil,
- wherein application of power to the resistive heating element causes expansion of at least the first and second poles and wherein the portion is disposed a distance within a range of 20 μm to 60 μm from the air-bearing surface.
2 more elements
A disc drive adapted to store information on at least one spinning magnetic disc, the disc drive comprising:
- a slider body having a trailing surface meeting an air-bearing surface at a trailing edge;
- a thin-film transducer disposed on the trailing surface near the trailing edge, the thin-film transducer comprising first and second poles and a coil having a first set of turns disposed in a first general plane and a second set of turns disposed in a second general plane, the coil including a first section disposed between the first and second poles nearest the air-bearing surface, and a second section disposed farthest from the air-bearing surface;
- an air bearing tending, during operation of the disc drive, to separate the first and second poles from a surface of the disc by an average flying height;
- a resistive heating element, at least a portion of the resistive heating element being disposed between, and electrically insulated from, the first set of turns and the second set of turns in the second section of the coil,
- wherein a temporary application of power to the resistive heating element causes a correspondingly temporary expansion of at least the first and second poles such that the flying height of the thin-film transducer is temporarily reduced and wherein the portion is disposed a distance within a range of 20 μm to 60 μm from the air-bearing surface.
2 more elements
A magnetic head comprising:
- a slider body having a trailing surface meeting an air-bearing surface at a trailing edge;
- a thin-film transducer disposed along the trailing surface near the trailing edge, the thin-film transducer including a coil embedded between first and second poles, the coil having a first set of turns disposed in a first general plane and a second set of turns disposed in a second general plane, the coil including a first section disposed between the first and second poles nearest the trailing edge, and a second section disposed farthest from the trailing edge;
- the magnetic head further comprising:
- a resistive heating element, at least a portion of the resistive heating element being disposed between, and electrically insulated from, the first set of turns and the second set of turns in the second section of the coil,
- wherein application of power to the resistive heating element causes expansion of at least the first and second poles and wherein the portion is disposed a distance within a range of 20 μm to 60 μm from the air-bearing surface.
2 more elements
A magnetic head comprising:
- a slider body having a trailing surface meeting an air-bearing surface at a trailing edge;
- a thin-film transducer disposed along the trailing surface near the trailing edge, the thin-film transducer including a coil that is electrically connected to a terminal bond pad via a coil connection trace located a distance away from the trailing edge;
- and
- a resistive heating element comprising an elongated strip of resistive material disposed substantially over the coil connection trace,
- wherein application of power to the resistive heating element causes expansion of at least a part of the thin-film transducer.
2 more elements
A magnetic head comprising:
- a slider body having a trailing surface meeting an air-bearing surface at a trailing edge;
- a thin-film transducer disposed along the trailing surface near the trailing edge, the thin-film transducer including a coil having at least partially embedded between first and second poles, the coil having a first set of turns disposed in a first general plane and a second set of turns disposed in a second general plane;
- a resistive heating element, at least a portion of the resistive heating element being disposed between, and electrically insulated from, the first set and second set of turns of the coil, the resistive heating element comprising a resistive material having a temperature coefficient of resistivity of about (1.5/° C.)×10−4 or less, a coefficient of thermal expansion of about (2.0/° C.)×10−5 or less, and a thermal conductivity of about 10 W/mK or greater;
- wherein application of power to the resistive heating element causes expansion of at least the first and second poles and wherein the portion is disposed a distance within a range of 20 μm to 60 μm from the air-bearing surface.
1 more element
A disc drive adapted to store information on at least one spinning magnetic disc, the disc drive comprising:
- a slider body having a trailing surface meeting an air-bearing surface at a trailing edge;
- a thin-film transducer disposed on the trailing surface near the trailing edge, the thin-film transducer including:
- a magnetoresistive (MR) element disposed within a gap material bounded by shield material;
- first and second poles, an air bearing tending, during operation of the disc drive, to separate the first and second poles from a surface of the disc by an average flying height;
- a coil at least partially disposed between the first and second poles, the coil including first and second sets of turns disposed in first and second general planes, respectively;
- the thin-film transducer further comprising:
- a resistive heating element, at least a portion of the resistive heating element being disposed between the first and second sets of turns of the coil, wherein a temporary application of power to the resistive heating element causes a correspondingly temporary expansion of at least the first and second poles such that the flying height of the thin-film transducer is temporarily reduced and wherein the portion is disposed a distance within a range of 20 μm to 60 μm from the air-bearing surface.
4 more elements
A magnetic head comprising:
- a slider body having a trailing surface meeting an air-bearing surface (ABS) at a trailing edge;
- a magnetic recording element disposed along the trailing surface near the trailing edge, the magnetic recording element including pole tips located at the ABS and a coil having first and second turn layers disposed in first and second general planes, respectively;
- a heating element, at least a portion of the heating element being disposed in a third general plane between the first and second turn layers of the coil;
- and
- wherein current flow through the heating element causes expansion of the pole tips and wherein the portion is disposed a distance within a range of 20 μm to 60 μm from the air-bearing surface.
2 more elements
A magnetic head comprising:
- a slider body having a trailing surface meeting an air-bearing surface (ABS) at a trailing edge;
- a magnetic reproducing element disposed along the trailing surface near the trailing edge
- a magnetic recording element disposed along the trailing surface near the trailing edge, the magnetic recording element including pole tips located at the ABS and a coil having first and second turn layers disposed in first and second general planes, respectively;
- a heating element, at least a portion of the heating element being disposed in a third general plane beneath the first and second turn layers of the coil, and above the magnetic reproducing element;
- and
- wherein current flow through the heating element causes expansion of the pole tips and wherein the portion is disposed a distance within a range of 20 μm to 60 μm from the air-bearing surface.
3 more elements
A magnetic head comprising:
- a slider body having a trailing surface meeting an air-bearing surface at a trailing edge;
- a thin-film transducer disposed on the trailing surface near the trailing edge, the thin-film transducer including a coil embedded between first and second poles, the coil having a first set of turns disposed in a first general plane and a second set of turns disposed in a second general plane, wherein the coil is electrically connected to a terminal bond pad via a coil connection trace located a distance away from the trailing edge;
- a first resistive heating element, at least a portion of the resistive heating element being disposed between, and electrically insulated from, the first set and second set of turns of the coil;
- and
- a second resistive heating element comprising an elongated strip of resistive material disposed substantially over the coil connection trace
- wherein application of power to the first resistive heating element causes expansion of at least the first and second poles and application of power to the second resistive heating element causes expansion of at least a part of the thin-film transducer.
3 more elements
A magnetic head comprising:
- a slider body having a trailing surface meeting an air-bearing surface at a trailing edge;
- a thin-film transducer disposed along the trailing surface near the trailing edge, the thin-film transducer including a coil that is electrically connected to a terminal bond pad via a coil connection trace located a distance away from the trailing edge;
- and
- a resistive heating element comprising an elongated strip of resistive material substantially beneath the coil connection trace,
- wherein application of power to the resistive heating element causes expansion of at least a part of the thin-film transducer.
2 more elements
Dependencies are inferred from the claim text.