Magnetic recording head with resistive heating element located near the write coil

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.

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.

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.

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.

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.

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.

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.