Magnetic recording head with resistive heating element located near the write coil
View Patent ↗A magnetic head includes a slider body having a trailing surface meeting an air-bearing surface at a trailing edge and a thin-film transducer that includes a magnetic reproducing element with a magnetoresistive (MR) element disposed near the trailing edge within a gap material bounded by upper and lower shield layers. The thin-film transducer also includes a lower pole layer of a magnetic recording element disposed in a first general plane. The magnetic recording element further includes a coil having first and second turn layers disposed in second and third general planes, respectively. The magnetic head also includes resistive heating element with at least a portion of the heating element being disposed in a fourth general plane beneath both the lower pole layer and the coil but above the upper shield layer. Current flow through the heating element causes expansion of the magnetic reproducing and recording elements at the ABS.
1. A magnetic head comprising:
a slider body having a trailing surface meeting an air-bearing surface at a trailing edge; and
a thin-film transducer disposed on the trailing surface near the trailing edge, the thin-film transducer including:
a magnetoresistive (MR) element disposed near the trailing edge between upper and lower shield layers;
upper and lower pole layers disposed near the trailing edge;
a coil having first and second turn layers, each of the first and second turn layers being disposed between the upper and lower pole layers; and
a resistive heating element, at least a portion of the heating element being disposed beneath both the lower pole layer and the coil, but above the upper shield layer;
wherein current flow through the heating element causes expansion of the magnetic reproducing and recording elements at the ABS; and
wherein the resistive heating element comprises a resistive material having a temperature coefficient of resistivity of about (1.5/° C.)×10 −4 or less.
2. The magnetic head of claim 1 wherein the coil comprises a first set of turns disposed nearest the ABS and a second set of turns disposed farthest from the ABS, and wherein the resistive heating element is disposed directly beneath the first set of turns.
3. The magnetic head of claim 2 wherein the portion is disposed a distance within a range of 2 μm to 20 μm from the ABS.
4. The magnetic head of claim 1 wherein the coil comprises a first set of turns disposed nearest the ABS and a second set of turns disposed farthest from the ABS, and wherein the resistive heating element is disposed directly beneath the second set of turns.
5. The magnetic head of claim 4 wherein the portion is disposed a distance within a range of 20 μm to 60 μm from the ABS.
6. 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 magnetoresistive (MR) element disposed near the trailing edge between upper and lower shield layers;
upper and lower pole layers disposed near the trailing edge;
a coil having first and second turn layers, each of the first and second turn layers being disposed between the upper and lower pole layers;
a resistive heating element, at least a portion of the heating element being disposed beneath both the lower pole layer and the coil, but above the upper shield layer;
wherein current flow through the heating element causes expansion of the magnetic reproducing and recording elements at the ABS; and
wherein the resistive heating element comprises a resistive material having a coefficient of thermal expansion of about (2.0/° C.)×10 −5 or less.
7. 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 magnetoresistive (MR) element disposed near the trailing edge between upper and lower shield layers;
upper and lower pole layers disposed near the trailing edge;
a coil having first and second turn layers, each of the first and second turn layers being disposed between the upper and lower pole layers;
a resistive heating element, at least a portion of the heating element being disposed beneath both the lower pole layer and the coil, but above the upper shield layer;
wherein current flow through the heating element causes expansion of the magnetic reproducing and recording elements at the ABS; and
wherein the resistive heating element comprises a resistive material having a thermal conductivity of about 10W/mK or greater.
8. 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 magnetoresistive (MR) element disposed near the trailing edge between upper and lower shield layers;
upper and lower pole layers disposed near the trailing edge;
a coil having first and second turn layers, each of the first and second turn layers being disposed between the upper and lower pole layers;
a resistive heating element, at least a portion of the heating element being disposed beneath both the lower pole layer and the coil, but above the upper shield layer;
wherein current flow through the heating element causes expansion of the magnetic reproducing and recording elements at the ABS; and
wherein the resistive heating element comprises a resistive material consisting essentially of NiCr, CuMnNi, or CuNi.
9. A magnetic head comprising:
a substrate;
upper and lower magnetic shield layers;
a magnetoresistive (MR) element embedded in a first nonmagnetic layer bounded by the upper and lower magnetic shield layers;
upper and lower pole layers, the lower pole layer being separated from the upper magnetic shield layer by a second layer of nonmagnetic material;
a coil between the upper and lower pole layers; and
a resistive heating element, at least a portion of the resistive heating element being embedded within the second layer of nonmagnetic material and disposed beneath the coil;
wherein the resistive heating element comprises a resistive material consisting essentially of NiCr, CuMnNi, or CuNi.
10. A magnetic head comprising:
a substrate;
upper and lower magnetic shield layers;
a magnetoresistive (MR) element embedded in a first nonmagnetic layer bounded by the upper and lower magnetic shield layers;
upper and lower pole layers, the lower pole layer being separated from the upper magnetic shield layer by a second layer of nonmagnetic material;
a coil between the upper and lower pole layers; and
a resistive heating element, at least a portion of the resistive heating element being embedded within the second layer of nonmagnetic material and disposed beneath the coil;
wherein the resistive heating element comprises a strip of material having a resistance in a range of 30Ω to 200Ω, a thickness in a range of 0.01 μm to 0.5 μm, and a width in a range of 5 μm to 25 μm.
11. A magnetic head comprising:
a substrate;
upper and lower magnetic shield layers;
a magnetoresistive (MR) element embedded in a first nonmagnetic layer bounded by the upper and lower magnetic shield layers;
upper and lower pole layers, the lower pole layer being separated from the upper magnetic shield layer by a second layer of nonmagnetic material;
a coil between the upper and lower pole layers; and
a resistive heating element, at least a portion of the resistive heating element being embedded within the second layer of nonmagnetic material and disposed beneath the coil;
wherein the resistive heating element comprises a resistive material having a temperature coefficient of resistivity of about (1.5/° C.)×10 −4 or less.
12. A magnetic head comprising:
a substrate;
upper and lower magnetic shield layers;
a magnetoresistive (MR) element embedded in a first nonmagnetic layer bounded by the upper and lower magnetic shield layers;
upper and lower pole layers, the lower pole layer being separated from the upper magnetic shield layer by a second layer of nonmagnetic material;
a coil between the upper and lower pole layers; and
a resistive heating element, at least a portion of the resistive heating element being embedded within the second layer of nonmagnetic material and disposed beneath the coil;
wherein the resistive heating element comprises a resistive material having a coefficient of thermal expansion of about (2.0/° C.)×10 −5 or less.