Single-pole recording head having trapezoidal main pole and bevel angle promotion layer and methods of fabricating the same
View Patent ↗A single-pole perpendicular magnetic recording head contains a bevel angle promotion layer that facilitates the fabrication of the bevel angle in a trapezoidal main pole. The bevel angle promotion layer is made of a non-magnetic material that is softer than the material (e.g., Al 2 O 3 ) that normally underlies the main pole. In one embodiment, the bevel angle promotion layer is formed between an end of the yoke and the air bearing surface (ABS), with the top surface of the bevel angle promotion layer being substantially coplanar with the top surface of the yoke. In other embodiment the bevel angle promotion layer is integrated with a leading edge taper material, which is formed of a magnetic material, to broaden the magnetic flux path between the yoke and the main pole.
1. A magnetic recording head comprising an auxiliary pole, a back gap, a yoke, and a main pole, each formed of a magnetic material and all connected in a magnetic flux path, said auxiliary and main poles terminating at an air bearing surface, wherein:
said yoke is located on a nonmagnetic layer made of a first material, said nonmagnetic layer being located between said yoke and said auxiliary pole;
said main pole is located on a bevel angle promotion layer made of a second material, said second material being softer than said first material; and
said main pole has a trapezoidal shape in a cross section parallel to said air bearing surface.
2. The magnetic recording head of claim 1 wherein a top surface of said bevel angle promotion layer is coplanar with a top surface of said yoke.
3. The magnetic recording head of claim 1 wherein said bevel angle promotion layer is located between an end of said yoke and said air bearing surface.
4. The magnetic recording head of claim 1 wherein said second material is selected from the group consisting of NiP, Rh, Ta, NiCr and Cd.
5. The magnetic recording head of claim 4 wherein said first material is Al 2 O 3 .
6. The magnetic recording head of claim 1 wherein said magnetic flux path further comprises a leading edge taper layer formed of a magnetic material, said leading edge taper layer being sandwiched in said magnetic flux path between said yoke and said main pole, said yoke having an end facing said air bearing surface, an end of said leading edge taper layer being located closer to said air bearing surface than said end of said yoke.
7. The magnetic recording head of claim 6 wherein said bevel angle promotion layer is located between said leading edge taper layer and said air bearing surface.
8. The magnetic recording head of claim 7 wherein a first end of said bevel angle promotion layer abuts an end of said leading edge taper layer.
9. The magnetic recording head of claim 8 wherein an interface between said bevel angle promotion layer and said leading edge taper layer is at an oblique angle with respect to said air bearing surface.
10. The magnetic recording head of claim 8 wherein a second end of said bevel angle promotion layer is located at said air bearing surface.
11. The magnetic recording head of claim 6 wherein said main pole abuts said bevel angle promotion layer and said leading edge taper layer.