Cooling periods used during the writing of bit boundaries to a magnetic recording media

An apparatus comprising:

• a controller capable of being coupled to a write coil of a recording head and a heat source that applies heat to a magnetic recording media via the recording head, the controller comprising:
• a preamplifier configured to apply a write signal with polarity transitions to the write coil, the polarity transitions corresponding to first bit boundaries written to the magnetic recording media;
• and
• a signal line configured to apply a heat signal to the heat source while bits are being written, the heat signal comprising negative pulses that de-energize the heat source during cooling periods corresponding to the writing of the first bit boundaries, the negative pulses offset from the polarity transitions by a predetermined time.

A system comprising:

• a recording head communicatively coupled to a magnetic recording media, the recording head comprising a write coil and coupled to a heat source;
• and
• a transition detector configured to produce negative pulses in response to polarity transitions of a write signal applied to the write coil, the polarity transitions corresponding to first bit boundaries written to the magnetic recording media;
• and
• a laser driver configure to apply a heat signal to the heat source while bits are being written;
• a delay element that offsets the negative pulses from the polarity transitions by a predetermined time;
• and
• a combinatorial circuit that applies the negative pulses to the heat signal to de-energize the heat source during cooling periods corresponding to the writing of the first bit boundaries.