Magnetic head including a thermal asperity effect element sensor in a stepped-back position from an air bearing surface
View Patent ↗A magnetic head disposed in a slider arranged with an interval with respect to a magnetic disk includes a sensor that is positioned in a stepped-back position from an air bearing surface facing the magnetic disk, an insulating film that is positioned on the air bearing surface and that covers the sensor; a pair of lead films, the lead films being electrically connected to the sensor such that at least portions of the lead films are exposed on the air bearing surface, and being configured to transfer a temperature change of the air bearing surface to the sensor.
1. A magnetic head disposed in a slider arranged with an interval with respect to a magnetic disk, comprising:
a thermal asperity effect element sensor that is configured to measure an electrical resistance value of an inside of the sensor for detection of contact between the magnetic head and a surface of the magnetic disk, and that is positioned in a stepped-back position from an air bearing surface facing the magnetic disk;
an insulating film that is positioned on the air bearing surface and that covers the sensor;
a pair of lead films, the lead films being electrically connected to the sensor such that at least portions of the lead films are exposed on the air bearing surface, and being configured to transfer a temperature change of the air bearing surface to the sensor; and
a reproducing element part for reproducing information recorded on the magnetic disk, wherein
the reproducing element part is provided separately from the sensor.
2. The magnetic head according to claim 1 , further comprising:
a heater that is provided in the slider and that decreases a flying height of the magnetic head from the magnetic disk due to a heat expansion of the slider.
3. The magnetic head according to claim 1 , wherein
an electrical resistance value of the sensor varies corresponding to a temperature change of the air bearing surface as transferred through the lead films, and
the pair of the lead films respectively connect both edge parts of the sensor and apply a voltage to the sensor.
4. The magnetic head according to claim 1 , wherein
the stepped-back distance of the sensor from the air bearing surface is 10 nm or more.
5. The magnetic head according to claim 4 , wherein
the stepped-back distance of the sensor from the air bearing surface is 200 nm or less.
6. The magnetic head according to claim 1 , wherein
the pair of lead films include at least a material having a heat conductivity ratio of 70 W/(m·k) or more.