Granted Patent B2

US 12,456,488 · App. 18/922,977 · Granted Oct 28, 2025

Inventors: Takao Furuhashi (Kawasaki Kanagawa, JP); Kaori Kimura (Yokohama Kanagawa, JP)

Assignees: Kabushiki Kaisha Toshiba; Toshiba Electronic Devices & Storage Corporation

G11B5/59627G11B2005/0021

Abstract

Claims (24)

1 . A method of adjusting a heat assisted magnetic recording and reproducing device incorporating a heat assisted magnetic recording head which comprises a main pole, a near-field transducer generating near-field light, a waveguide transmitting light to the near-field transducer, and a light source supplying light to the waveguide, and a heat assisted magnetic recording medium which comprises a lubricant layer on a recording surface facing the heat assisted magnetic recording head, the method comprising:

maintaining the heat assisted magnetic recording head in an on-track state; and

maintaining a recording current for data recording below a threshold value, for the heat assisted magnetic recording head, applying a light source drive current for emitting light to the light source, and generating a lubricant-cured material at a distal end of the near-field transducer.

2 . The method of claim 1 , wherein

the threshold value is greater than 0 and less than or equal to 17 mA.

3 . The method of claim 1 , wherein

the recording current is 0.

4 . The method of claim 1 , further comprising:

forming the lubricant-cured material and then forming a concentric or spiral reference servo pattern for servo writes on the recording surface.

5 . The method of claim 1 , further comprising:

adjusting the heat assisted magnetic recording and reproducing device in a user environment.

6 . The method of claim 1 , wherein

the maintaining the heat assisted magnetic recording head in the on-track state includes moving the heat assisted magnetic recording head to a defect registration spot or an SMR band position.

7 . The heat assisted magnetic recording and reproducing device comprising:

a heat assisted magnetic recording head which comprises a main pole, a near-field transducer generating near-field light, a waveguide transmitting light to the near-field transducer, and a light source supplying light to the waveguide;

a heat assisted magnetic recording medium which comprises a lubricant layer on a recording surface facing the heat assisted magnetic recording head;

a head position controller maintaining the heat assisted magnetic recording head in an on-track state;

a data recording current controller controlling a data recording current to be applied to the heat assisted magnetic recording head;

a light source drive current controller controlling a light source drive current to be applied to the light source; and

a lubricant-cured material generation processor performing a process of applying the light source drive current to the light source and generating a lubricant-cured material at a distal portion of the near-field transducer while controlling the data recording current below a threshold value.

8 . The heat assisted magnetic recording and reproducing device of claim 7 , wherein

the threshold value is in a range from 0 to 17 mA.

9 . The heat assisted magnetic recording and reproducing device of claim 7 , wherein

the threshold value is 0.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (11)