Method and system for pulsing EAMR disk drives

An energy assisted magnetic recording (EAMR) disk drive comprising:

• a magnetic recording media;
• a pre-amplifier for providing a write current signal and a write gate signal for providing power;
• an EAMR head, the EAMR head including at least one write transducer and at least one laser, the at least one write transducer coupled with the pre-amplifier and including at least one writer coil, the write current signal driving the at least one writer coil;
• at least one clock recovery circuit coupled with the at least one laser, the at least one clock recovery circuit receiving the write current signal and the write gate signal and outputting at least one laser control signal that energizes the at least one laser such that the at least one laser is energized synchronously with the at least one writer coil, the at least one laser control signal having a first data rate and the write current signal having a second data rate substantially half of the first data rate;
• wherein the write current signal has a plurality of transitions and wherein the at least one laser control signal energizes the laser for each of the plurality of transitions.

An energy assisted magnetic recording (EAMR) disk drive comprising:

• a magnetic recording media;
• a pre-amplifier for providing a write current signal and a write gate signal for providing power;
• an EAMR head, the EAMR head including at least one write transducer and at least one laser, the at least one write transducer coupled with the pre-amplifier and including at least one writer coil, the write current signal driving the at least one writer coil;
• at least one clock recovery circuit coupled with the at least one laser, the at least one clock recovery circuit receiving the write current signal and the write gate signal and outputting at least one laser control signal that energizes the at least one laser such that the at least one laser is energized synchronously with the at least one writer coil;
• and
• wherein the at least one clock recovery circuitry resides on the EAMR head.

An energy assisted magnetic recording (EAMR) disk drive comprising:

• a magnetic recording media;
• a pre-amplifier for providing a write current signal and a write gate signal for providing power;
• an EAMR head, the EAMR head including at least one write transducer and at least one laser, the at least one write transducer coupled with the pre-amplifier and including at least one writer coil, the write current signal driving the at least one writer coil;
• at least one clock recovery circuit coupled with the at least one laser, the at least one clock recovery circuit receiving the write current signal and the write gate signal and outputting at least one laser control signal that energizes the at least one laser such that the at least one laser is energized synchronously with the at least one writer coil;
• and
• wherein the at least one laser is a laser diode and wherein at least one clock recovery circuitry resides in proximity to the laser diode.

An energy assisted magnetic recording (EAMR) disk drive comprising:

• a magnetic recording media;
• a pre-amplifier for providing a write current signal and a write gate signal for providing power;
• an EAMR head, the EAMR head including at least one write transducer and at least one laser, the at least one write transducer coupled with the pre-amplifier and including at least one writer coil, the write current signal driving the at least one writer coil;
• at least one clock recovery circuit coupled with the at least one laser, the at least one clock recovery circuit receiving the write current signal and the write gate signal and outputting at least one laser control signal that energizes the at least one laser such that the at least one laser is energized synchronously with the at least one writer coil;
• and
• wherein the at least one clock recovery circuitry resides in the preamplifier.

A method for writing data to a recording media in an energy assisted magnetic recording (EAMR) disk drive, the EAMR disk drive including at least one laser and at least one EAMR head coupled with the at least one laser, each of the at least one EAMR head including a write transducer including at least one writer coil and at least one write pole, the method comprising:

• providing a write current signal to the EAMR head using a pre-amplifier, the write signal for energizing the at least one writer coil;
• providing a write gate signal to the EAMR head using the pre-amplifier, the write gate signal providing power to the EAMR head;
• generating at least one laser control signal using at least one clock recovery circuit coupled with the laser, the at least one laser control signal being synchronized with the write current signal, the at least one laser control signal for energizing the at least one laser such that the at least one laser is energized synchronously with the at least one writer coil, the at least one laser control signal having a first data rate and the write current signal having a second data rate substantially half of the first data rate;
• wherein the write current signal has a plurality of transitions and wherein the at least one laser control signal energizes the at least one laser for each of the plurality of transitions.

A method for writing data to a recording media in an energy assisted magnetic recording (EAMR) disk drive, the EAMR disk drive including at least one laser and at least one EAMR head coupled with the at least one laser, each of the at least one EAMR head including a write transducer including at least one writer coil and at least one write pole, the method comprising:

• providing a write current signal to the EAMR head using a pre-amplifier, the write signal for energizing the at least one writer coil;
• providing a write gate signal to the EAMR head using the pre-amplifier, the write gate signal providing power to the EAMR head;
• generating at least one laser control signal using at least one clock recovery circuit coupled with the laser, the at least one laser control signal being synchronized with the write current signal, the at least one laser control signal for energizing the at least one laser such that the at least one laser is energized synchronously with the at least one writer coil;
• wherein the at least one clock recovery circuitry resides on the EAMR head.

A method for writing data to a recording media in an energy assisted magnetic recording (EAMR) disk drive, the EAMR disk drive including at least one laser and at least one EAMR head coupled with the at least one laser, each of the at least one EAMR head including a write transducer including at least one writer coil and at least one write pole, the method comprising:

• providing a write current signal to the EAMR head using a pre-amplifier, the write signal for energizing the at least one writer coil;
• providing a write gate signal to the EAMR head using the pre-amplifier, the write gate signal providing power to the EAMR head;
• generating at least one laser control signal using at least one clock recovery circuit coupled with the laser, the at least one laser control signal being synchronized with the write current signal, the at least one laser control signal for energizing the at least one laser such that the at least one laser is energized synchronously with the at least one writer coil;
• wherein the at least one laser is a laser diode and wherein at least one clock recovery circuitry resides in proximity to the laser diode.

A method for writing data to a recording media in an energy assisted magnetic recording (EAMR) disk drive, the EAMR disk drive including at least one laser and at least one EAMR head coupled with the at least one laser, each of the at least one EAMR head including a write transducer including at least one writer coil and at least one write pole, the method comprising:

• providing a write current signal to the EAMR head using a pre-amplifier, the write signal for energizing the at least one writer coil;
• providing a write gate signal to the EAMR head using the pre-amplifier, the write gate signal providing power to the EAMR head;
• generating at least one laser control signal using at least one clock recovery circuit coupled with the laser, the at least one laser control signal being synchronized with the write current signal, the at least one laser control signal for energizing the at least one laser such that the at least one laser is energized synchronously with the at least one writer coil;
• wherein the at least one clock recovery circuitry resides in the preamplifier.