A data storage device is disclosed comprising a first head actuated over a first disk surface, the first head comprising a plurality of elements including a first element. During a first write operation of the first head, a first bias signal having a first polarity is applied to the first element, and a write interval of the first write operation is measured. During a non-write mode of the first head, a second bias signal having a second polarity opposite the first polarity is applied to the first element during a reverse bias interval that is based on the write interval of the first write operation.

A perpendicular magnetic recording write head includes a heater on one side of the pole tip of the main pole and a heat sink on the opposite side of the pole tip. The heater is formed of high resistivity material and is connected to a power source. During writing, power is applied to the heater, which causes a relatively large temperature gradient across the pole tip from the heater to the heat sink. The temperature gradient increases the damping of the ferromagnetic material of the main pole during writing, which increases the switching speed of the main pole.

A perpendicular magnetic recording write head includes a heater on one side of the pole tip of the main pole and a heat sink on the opposite side of the pole tip. The heater is formed of high resistivity material and is connected to a power source. During writing, power is applied to the heater, which causes a relatively large temperature gradient across the pole tip from the heater to the heat sink. The temperature gradient increases the damping of the ferromagnetic material of the main pole during writing, which increases the switching speed of the main pole.

A disk drive head assembly includes a spin torque oscillator (STO) situated between a main pole and a trailing shield. A head-disk interference (HDI) sensor is placed between the main pole and a read sensor shield. A trace is connected between a preamplifier and the head assembly for providing a first biasing voltage level to the spin torque oscillator (STO) and to the head-disk interference (HDI) sensor for determining resistance changes in the head-disk interference (HDI) sensor. Further, the preamplifier is configured for determining a resistance change in the head-disk interference (HDI) sensor based on a change in current through the head-disk interference (HDI) sensor. The spin torque oscillator (STO) and the head-disk interference (HDI) sensor are connected in parallel to two connectors from the two contacting pads on the preamplifier.

A disk drive head assembly includes a spin torque oscillator (STO) situated between a main pole and a trailing shield. A head-disk interference (HDI) sensor is placed between the main pole and a read sensor shield. A trace is connected between a preamplifier and the head assembly for providing a first biasing voltage level to the spin torque oscillator (STO) and to the head-disk interference (HDI) sensor for determining resistance changes in the head-disk interference (HDI) sensor. Further, the preamplifier is configured for determining a resistance change in the head-disk interference (HDI) sensor based on a change in current through the head-disk interference (HDI) sensor. The spin torque oscillator (STO) and the head-disk interference (HDI) sensor are connected in parallel to two connectors from the two contacting pads on the preamplifier.

A method of operating a HDD having a read/write head configured for Perpendicular Magnetic Recording (PMR) and configured for use in Thermally Assisted Magnetic Recording (TAMR). By using selected settings of a power ratio (PR) value to ensure that accurate fly height (FH) measurements of head-disk interference (HDI) can be taken during write touchdowns (TDs), head damage can be eliminated during HDI events. Under normal operating conditions the PMR head develops a sharp protrusion due to heating from the TAMR apparatus as well as the write current and read and write heaters. The sharp protrusion is prone to striking the disk surface, instead of the shields doing so. The shields would be more capable of absorbing the HDI, which would allow the HDI sensors (HDIs) to provide a more sensitive reading of the HDI which would prevent head wear caused by the sharp protrusion. By adjusting the power ratio (PR) to be at least the turning point (TP) value, the write shield will approach the disk surface before the sharp protrusion.

According to one embodiment, a magnetic recording and reading apparatus has a magnetic head and a system controlling a flying height of the magnetic head. The system includes a main control unit, a resistance measurement unit which measures a resistance value of a magnetic flux control layer, a calculation unit which obtains a resistance value change rate with respect to an initial resistance value, a determination unit which determines a flying height for recording corresponding to the resistance value change rate, and a flying height control unit which controls a flying height of the magnetic head.

According to one embodiment, a magnetic recording and reading apparatus has a magnetic head and a system controlling a flying height of the magnetic head. The system includes a main control unit, a resistance measurement unit which measures a resistance value of a magnetic flux control layer, a calculation unit which obtains a resistance value change rate with respect to an initial resistance value, a determination unit which determines a flying height for recording corresponding to the resistance value change rate, and a flying height control unit which controls a flying height of the magnetic head.

A data storage device is disclosed comprising a first head actuated over a first disk surface, the first head comprising a plurality of elements including a first element. During a first write operation of the first head, a first bias signal having a first polarity is applied to the first element, and a write interval of the first write operation is measured. During a non-write mode of the first head, a second bias signal having a second polarity opposite the first polarity is applied to the first element during a reverse bias interval that is based on the write interval of the first write operation.

A PMR read/write head configured for thermally assisted recording (TAMR) includes thermally active bumper pads formed to each side of a write element to provide enhanced touchdown (TD) protection to the write head element where it emerges adjacent to the plasmon near-field spot produced by the TAMR apparatus. The bumper pads are disposed about the write head and absorb heat energy generated by active heating elements, the write current and the energy generated by the TAMR apparatus. Absorption of this energy causes the bumper pads to expand and protrude outward from the slider ABS to protect the read/write head from both intentional and unanticipated touchdown events. The PMR read/write head is then mounted on a slider and the assembly is incorporated into a hard disk drive (HDD).