Servo pattern by microwave assisted magnetic recording, perpendicular magnetic recording medium, magnetic storage device and method for manufacturing the same

A servo track writer that records servo information including a servo sequence on a perpendicular magnetic recording medium, the servo sequence providing positioning information made up of a seamless pattern having recording footprint in size that can be substantially ignored and having a total amount of recording magnetization that is substantially zero, comprising:

• a plurality of magnetic heads where each magnetic head includes:
• a recording magnetic pole generating a recording magnetic field;
• a high-frequency oscillation element provided in a recording gap of the recording magnetic pole and generating a high-frequency magnetic field;
• a magnetic reproduction element that reads information from a perpendicular magnetic recording medium;
• and a TFC (Thermal Flying Height Controller) element that adjusts clearance between the high-frequency generation element and a perpendicular magnetic recording medium;
• a servo information recording/reproducing control unit that controls and processes a recording operation by the recording magnetic pole and the high-frequency oscillation element and a reproducing operation by the magnetic reproduction element for each magnetic head concurrently;
• a TFC controller that controls an operation of the TFC element for each magnetic head concurrently;
• and
• a mechanism that fills He in an environment enclosing the magnetic heads, the magnetic recording medium and a mechanical unit during servo information recording.

A perpendicular magnetic recording medium, comprising a servo area where a magnetization pattern including a servo sequence that provides positioning information is recorded, the servo area further including an alternating current (AC) demagnetization area, wherein

• the servo sequence includes a seamless pattern having recording footprint in size that can be substantially ignored,
• a total amount of recording magnetization of the servo sequence is substantially zero;
• and
• the magnetization pattern includes negative and positive magnetization patterns which directly abut each other in a track length direction, all of the magnetization patterns at the servo area are seamless in a track width direction, and the magnetization pattern extends substantially across the entire track width direction.

A magnetic storage device, comprising

• a perpendicular magnetic recording medium;
• a medium driving unit that drives the perpendicular magnetic recording medium;
• a magnetic head including:
• a recording head unit including a recording magnetic pole unit generating recording magnetic field, and a high-frequency oscillation element generating high-frequency magnetic field;
• and a reproducing head unit including a reproduction element, the magnetic head performing recording/reproducing operations with respect to the perpendicular magnetic recording medium;
• and
• a head driving unit that performs positioning of the magnetic head with reference to a track on the perpendicular magnetic recording medium, wherein
• the perpendicular magnetic recording medium includes a servo area where a magnetization pattern including a servo sequence that provides positioning information is recorded, the servo area further including an alternating current (AC) demagnetization area, the servo sequence including a seamless pattern having recording footprint in size that can be substantially ignored, and a total amount of recording magnetization of the servo sequence is substantially zero;
• and
• the magnetization pattern includes negative and positive magnetization patterns which directly abut each other in a track length direction, all of the magnetization patterns at the servo area are seamless in a track width direction, and the magnetization pattern extends substantially across the entire track width direction.