Recording head with junctions between poles and disk drive with the same

A disk drive comprising:

• a recording medium comprising a magnetic recording layer having a magnetic anisotropy in a direction perpendicular to a surface of the medium;
• a drive unit configured to rotate the recording medium;
• and
• a magnetic head comprising a magnetic recording head and configured to record data on or read data from the recording medium,
• the magnetic recording head comprising:
• a disk-facing surface configured to face the recording medium;
• a main pole configured to produce a recording magnetic field in a direction perpendicular to a recording layer of the recording medium;
• a trailing shield which is located on the trailing side of the main pole with a write gap therebetween and forms a first magnetic core in cooperation with the main pole;
• a first junction of a nonmagnetic material which connects the trailing shield and the main pole in a position off the disk-facing surface;
• a second junction which comprises a nonmagnetic conductive layer comprising a high-frequency oscillator and connects the trailing shield and an end portion of the main pole on side of the disk-facing surface;
• a first coil wound around the first magnetic core;
• a leading shield which is located on the leading side of the main pole, comprises a distal end portion opposed to the end portion of the main pole on side of the disk-facing surface with a nonmagnetic material therebetween and a junction connected to the main pole in a position off the disk-facing surface with a third junction of a magnetic material therebetween and forms a second magnetic core in cooperation with the main pole;
• a second coil wound around the second magnetic core;
• and
• a connecting terminal configured to pass a current in series through the main pole, the nonmagnetic conductive layer and the trailing shield, wherein
• a thickness of the third junction in a direction parallel to the disk-facing surface is smaller than that of the first junction in the same direction.