Reduction of interference pickup in heads for magnetic recording by minimizing parasitic capacitance

A reduced capacitance magnetic head comprising:

• an electrical contact pad;
• a substrate on which the magnetic head is formed;
• a conducting layer formed over the substrate;
• a low dielectric material interposed between the pad and the substrate which is used as a platform for the electrical contact pad to increase the distance between the substrate and the electrical contact pad, the low dielectric material comprising hard bake photo resist and having a thickness of about 20 μm and a dielectric constant of about 3;
• and
• a conducting stud formed through the low dielectric material to make electrical connection between the electrical contact pad and the conducting layer.

A disk drive system, comprising:

• a reduced capacitance magnetic head comprising:
• an electrical contact pad;
• a substrate on which the magnetic head is formed;
• a material selected to have a low dielectric constant interposed between the pad and the substrate;
• and
• a magnetic recording disk;
• a spin-valve sensor for reading data recorded on the recording disk;
• and
• an actuator for moving the spin valve sensor across the magnetic recording disk in order for the spin-valve sensor to access different magnetically recorded data on the magnetic recording disk;
• and
• a detector electrically coupled to the spin-valve sensor and configured to detect changes in resistance of the sensor caused by rotation of the magnetization of the sensing layer relative to the fixed magnetizations of the pinned layer in response to changing magnetic fields induced by the magnetically recorded data.

A magnetic head comprising:

• a substrate on which the magnetic head is formed;
• an alumina undercoat layer comprising Al2O3 formed over the substrate;
• an electrical contact pad;
• and
• a layer of alumina interposed between the electrical contact pad and the alumina undercoat layer.

A magnetic head comprising:

• a substrate on which the magnetic head is formed;
• 3 an alumina undercoat layer comprising SiO2 formed over the substrate;
• an electrical contact pad;
• and
• a layer of alumina interposed between the electrical contact pad and the alumina undercoat layer.

A method of reducing capacitance in a magnetic head, comprising:

• providing a substrate;
• providing a read/write head;
• and
• isolating the read/write head from the substrate in order to reduce the capacitance coupling between the read head and the substrate.