A head includes a substrate, an undercoat material, a read structure, and a write structure. The undercoat material at least partially provides electrical insulation between the read structure and the substrate. The read structure allows for reading magnetic fields from a recording medium. The write structure allows for providing particular magnetic fields to the recording medium to write data to the recording medium. The read structure is located at least partially between a portion of the undercoat material and a portion of the write structure. The head further includes at least one of (i) a heating element located at least partially in the undercoat material for providing heat and (ii) a pedestal for at least partially providing thermal conduction between the read structure and the substrate. Also, a thickness of the undercoat material may be set for improving flying height adjustment efficiency.