Apparatus and method for setting slider surface potential
An apparatus includes a slider body of a disk drive. The slider body is electrically coupled to a plurality of end bond pads. A voltage applied to one more of the end bond pads sets a surface potential of the slider body.
1. An apparatus, comprising:
a slider body comprising a plurality of end bond pads and a conductive portion;
a sensor having a temperature coefficient of resistance coupled to a first end bond pad and a second end bond pad, the sensor configured for sensing in response to a differential voltage across the first and second end bond pads, and the sensor configured to set a surface potential of the conductive portion of the slider body in response to a common mode voltage applied to the first and second end bond pads, wherein the sensor comprises a first end coupled to the first end bond pad and a second end coupled to the second end bond pad;
a first resistor coupled between the first end of the sensor and the conductive portion of the slider body; and
a second resistor coupled between the second end of the sensor and the conductive portion of the slider body.
2. The apparatus of claim 1 , wherein the sensor comprises a dual-ended temperature coefficient of resistance (DETCR) sensor.
3. The apparatus of claim 2 , wherein the DETCR sensor is connected to ground.
4. The apparatus of claim 1 , wherein the sensor comprises a laser power monitor.
5. The apparatus of claim 1 , further comprising:
a third resistor having a first end coupled to ground and a second end coupled to the conductive portion of the slider body;
wherein the first and second resistors are coupled to the second end of the third resistor.
6. The apparatus of claim 1 , wherein the slider body is configured for heat-assisted magnetic recording.
7. An apparatus, comprising:
a slider body comprising a plurality of end bond pads and a conductive portion;
a sensor having a temperature coefficient of resistance coupled to a first end bond pad and a second end bond pad, the sensor configured for sensing in a first mode and to set a surface potential of the conductive portion of the slider body in a second mode, wherein the sensor comprises a first end coupled to the first end bond pad and a second end coupled to the second end bond pad;
a first resistor coupled between the first end of the sensor and the conductive portion of the slider body; and
a second resistor coupled between the second end of the sensor and the conductive portion of the slider body,
wherein the first mode is activated in response to a first voltage state of the first and second end bond pads, and the second mode is activated in response to a second voltage state of the first and second end bond pads.
8. The apparatus of claim 7 , wherein the first voltage state is a differential voltage state, and the second voltage state is a common mode voltage state.
9. The apparatus of claim 7 , wherein the sensor comprises a dual-ended temperature coefficient of resistance (DETCR) sensor.
10. The apparatus of claim 9 , wherein the DETCR sensor is connected to ground.
11. The apparatus of claim 7 , wherein the sensor comprises a laser power monitor.
12. The apparatus of claim 7 , further comprising:
a third resistor having a first end coupled to ground and a second end coupled to the conductive portion of the slider body;
wherein the first and second resistors are coupled to the second end of the third resistor.
13. The apparatus of claim 7 , wherein the slider body is configured for heat-assisted magnetic recording.