Read/write head with reduced pole tip protrusion
AssigneeWestern Digital (Fremont), LLC
InventorArshad A. Alfoqaha
Life of this patent
Estimating the term…
Abstract
A write element for use in a read/write head having an air bearing surface, so as to reduce pole tip protrusion. The write element includes a pole tip region; an insulation layer formed adjacent to the pole tip region; a coil embedded in the insulation layer which contributes to a protrusion force that generates a pole tip protrusion; and a layer of thermally expansive material formed over the insulation layer, and recessed from the air bearing surface, that expands in response to heat absorption, causing a rotational moment of force that counteracts the protrusion force thus reducing the pole tip protrusion.
Claims20
A read/write head for use in a data storage device to reduce pole tip protrusion, comprising:
- an air bearing surface;
- a pole tip region;
- an insulation layer formed adjacent to the pole tip region;
- a coil embedded in the insulation layer contributing to a protrusion force that generates a pole tip protrusion;
- and
- a layer of thermally expansive material formed over the insulation layer, and recessed from the air bearing surface, that expands in response to heat absorption, causing a rotational moment of force that counteracts the protrusion force thus reducing the pole tip protrusion.
A write element for use in a read/write head having an air bearing surface to reduce pole tip protrusion, comprising:
- a pole tip region;
- an insulation layer formed adjacent to the pole tip region;
- a coil embedded in the insulation layer contributing to a protrusion force that generates a pole tip protrusion;
- and
- a layer of thermally expansive material formed over the insulation layer, and recessed from the air bearing surface, that expands in response to heat absorption, causing a rotational moment of force that counteracts the protrusion force thus reducing the pole tip protrusion.
A disk drive comprising:
- a base;
- a spindle motor attached to the base;
- a disk positioned on the spindle motor;
- a head stack assembly coupled to the base and comprising:
- an actuator body;
- an actuator arm cantilevered from the actuator body;
- and
- a read/write head coupled to the actuator arm, and including:
- an air bearing surface;
- a pole tip region;
- an insulation layer formed adjacent to the pole tip region;
- a coil embedded in the insulation layer contributing to a protrusion force that generates a pole tip protrusion;
- and
- a layer of thermally expansive material formed over the insulation layer, and recessed from the air bearing surface, that expands in response to heat absorption, causing a rotational moment of force that counteracts the protrusion force thus reducing the pole tip protrusion.
Dependencies are inferred from the claim text.