Perpendicular recording magnetic head
View Patent ↗Embodiments of the present invention provide a perpendicular recording magnetic head having a narrow track width, high recording magnetic field intensity, and a good recording magnetic field distribution. According to one embodiment, a perpendicular recording magnetic head includes a read section and a write section. The write section includes a main magnetic pole layer, a lower sub magnetic pole layer, an upper sub magnetic pole layer, a pedestal magnetic layer, and a coil conductor generating a magnetic flux in the main magnetic pole layer. The write section further includes lower and upper auxiliary magnetic pole layers disposed on a leading side and a trailing side, respectively, relative to a medium moving direction, adjacent to the main magnetic pole layer. The lower and upper auxiliary magnetic pole layers are retracted from an air bearing surface. The upper auxiliary magnetic pole layer is retracted from the air bearing surface less than the lower auxiliary magnetic pole layer.
1. A perpendicular recording magnetic head, comprising:
a write section including:
a main magnetic pole layer having a leading end portion and a flare portion;
a first soft magnetic layer having a leading end retracted from an air bearing surface and disposed adjacent to a leading side of the main magnetic pole layer;
a second soft magnetic layer having a leading end retracted from the air bearing surface closer than the leading end of the first soft magnetic layer and disposed adjacent to a trailing side of the main magnetic pole layer;
a first sub magnetic pole layer disposed on the leading side of the main magnetic pole layer with a gap from the main magnetic pole layer at a side of the air bearing surface;
a pedestal magnetic layer disposed by way of a non-magnetic layer on the trailing side of the main magnetic pole layer at the side of the air bearing surface;
a second sub magnetic pole layer disposed on the trailing side of the main magnetic pole layer, the second sub magnetic pole layer being magnetically coupled to the pedestal magnetic layer at the side of the air bearing surface; and
a coil conductor generating a magnetic flux in the main magnetic pole layer; and
a read section disposed adjacent to the write section, the read section including a read element disposed between upper and lower magnetic shield layers,
wherein the first soft magnetic layer and the second soft magnetic layer are tapered, facing the air bearing surface, to follow along an opening angle of the flare portion of the main magnetic pole layer.
2. The perpendicular recording magnetic head according to claim 1 ,
wherein an amount of retraction of the first soft magnetic layer and the second soft magnetic layer ranges between 0.1 μm and 2.5 μm.
3. The perpendicular recording magnetic head according to claim 1 , wherein the first soft magnetic layer and the second soft magnetic layer are tapered through changes in a film thickness toward the air bearing surface.
4. The perpendicular recording magnetic head according to claim 1 , further comprising:
a pedestal magnetic pole layer disposed on a trailing side of the first sub magnetic pole layer at the side of the air bearing surface.
5. The perpendicular recording magnetic head according to claim 1 ,
wherein the first sub magnetic pole layer has a rear end magnetically coupled to the first magnetic layer;
wherein the second sub magnetic pole layer has a rear end magnetically coupled to the second magnetic layer; and
wherein the coil conductor is disposed so as to go around the main magnetic pole layer and the first and second soft magnetic layers.
6. The perpendicular recording magnetic head according to claim 1 ,
wherein the second sub magnetic pole layer has a rear end magnetically coupled to the second magnetic layer; and
wherein the coil conductor is disposed so as to go around the main magnetic pole layer and the first and second soft magnetic layers.
7. The perpendicular recording magnetic head according to claim 1 ,
wherein the first sub magnetic pole layer has a rear end magnetically coupled to the first magnetic layer;
wherein the second sub magnetic pole layer has a rear end magnetically coupled to the second magnetic layer; and
wherein the coil conductor includes a first coil interlinking a magnetic circuit including the first sub magnetic pole layer and the first magnetic layer and a second coil conductor interlinking a magnetic circuit including the second sub magnetic pole layer and the second magnetic layer.
8. The perpendicular recording magnetic head according to claim 1 , further comprising:
side shields disposed on both sides of the main magnetic pole layer by way of non-magnetic layers.
9. A perpendicular recording magnetic head, comprising:
a write section including:
a main magnetic pole layer having a leading end portion and a flare portion;
a first soft magnetic layer having a leading end retracted from an air bearing surface and disposed adjacent to a leading side of the main magnetic pole layer;
a second soft magnetic layer having a leading end retracted from the air bearing surface closer than the leading end of the first soft magnetic layer and disposed adjacent to a trailing side of the main magnetic pole layer;
a sub magnetic pole layer disposed with a gap from the main magnetic pole layer at a side of the air bearing surface;
a pedestal magnetic layer disposed by way of a non-magnetic layer on the trailing side of the main magnetic pole layer at the side of the air bearing surface; and
a coil conductor generating a magnetic flux in the main magnetic pole layer; and
a read section disposed adjacent to the write section, the read section including a read element disposed between upper and lower magnetic shield layers,
wherein the first soft magnetic layer and the second soft magnetic layer are tapered, facing the air bearing surface, to follow along an opening angle of the flare portion of the main magnetic pole layer.
10. The perpendicular recording magnetic head according to claim 9 ,
wherein the sub magnetic pole layer is disposed on the trailing side of the main magnetic pole layer and has a rear end magnetically coupled to the second soft magnetic layer;
wherein the coil conductor is disposed so as to interlink a magnetic circuit including the sub magnetic pole layer and the second soft magnetic layer; and
wherein a third soft magnetic layer is disposed between the read section and the first soft magnetic layer.
11. The perpendicular recording magnetic head according to claim 9 ,
wherein the sub magnetic pole layer is disposed on a leading side of the main magnetic pole layer and has a rear end magnetically coupled to the first soft magnetic layer;
wherein the coil conductor is disposed so as to interlink a magnetic circuit including the sub magnetic pole layer and the first soft magnetic layer; and
wherein a pedestal magnetic pole layer is disposed on a trailing side of the sub magnetic pole layer at the side of the air bearing surface.
12. The perpendicular recording magnetic head according to claim 9 ,
wherein an amount of retraction of the first soft magnetic layer and the second soft magnetic layer ranges between 0.1 μm and 2.5 μm.
13. The perpendicular recording magnetic head according to claim 9 , wherein the first soft magnetic layer and the second soft magnetic layer are tapered through changes in a film thickness toward the air bearing surface.