IP Library › Granted Patent US 8,144,426
Granted Patent B2
US 8,144,426 · App. 12/028,025 · Granted Mar 27, 2012

Perpendicular magnetic recording head having front and back poles of different specific resistances

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Quick Facts
Patent No.
US 8,144,426
App. No.
12/028,025
Granted
Mar 27, 2012
Kind
B2
Abstract

A perpendicular magnetic recording head and a method of manufacturing said perpendicular magnetic recording head are provided. The perpendicular magnetic recording head has a main pole, a coil, which applies a magnetic field to the main pole, and a return pole constituting a magnetic circuit together with the main pole. The main pole has a back pole around which the coil is wound and a front pole contacting the back pole. The back pole and the front pole are formed on the same plane.

Claims (18)

1. A perpendicular magnetic recording head comprising:

a main pole;

a coil, which applies a magnetic field to the main pole; and

a return pole constituting a magnetic circuit together with the main pole, wherein the main pole comprises a back pole around which the coil is wound and a front pole contacting the back pole, and

wherein the back pole and the front pole are formed on the same plane, and a specific resistance of the front pole is smaller than a specific resistance of the back pole.

2. The perpendicular magnetic recording head of claim 1 , wherein the front pole has a width, which increases towards a portion of the front pole, which contacts the back pole.

3. The perpendicular magnetic recording head of claim 1 , wherein a saturation magnetization of the front pole is larger than a saturation magnetization of the back pole.

4. The perpendicular magnetic recording head of claim 3 , wherein a saturation magnetization of the back pole is in a range of 1.0 to 2.0 Tesla.

5. The perpendicular magnetic recording head of claim 1 , wherein a specific resistance of the front pole is in a range of 10 to 30 μΩ·cm.

6. The perpendicular magnetic recording head of claim 1 , wherein the front pole is straight, and the back pole contacts an upper surface and a side surface of one end of the front pole.

7. The perpendicular magnetic recording head of claim 6 , wherein the side surface of the front pole, which contacts the back pole, faces the return pole.

8. The perpendicular magnetic recording head of claim 6 , wherein the side surface of the front pole, which contacts the back pole, is a first surface opposite a second surface of the front pole, and further wherein the second surface faces the return pole.

9. The perpendicular magnetic recording head of claim 8 , wherein the back pole comprises a first back pole, which contacts the upper surface of the front pole, and a second back pole, which contacts the side surface of the front pole.

10. The perpendicular magnetic recording head of claim 1 , wherein a first end of the front pole contacts the back pole and, further wherein a second end of the front pole is separated from the back pole by a distance in a range of 0.5 to 2.0 μm.

11. The perpendicular magnetic recording head of claim 1 , wherein an overlap length, by which the front pole and the back pole overlap each other, is in a range of 0.5 to 4.0 μm.

12. The perpendicular magnetic recording head of claim 1 , wherein the front pole has a thickness in a range of 0.2 to 0.4 μm.

13. The perpendicular magnetic recording head of claim 1 , wherein the back pole has a thickness in a range of 2 to 5 μm.

14. The perpendicular magnetic recording head of claim 1 , wherein the front pole and the return pole are separated by a distance in a range of 0.1 to 0.3 μm.