Dynamic DC field compensator for MAMR recording head
The present disclosure generally relates to a magnetic recording system comprising a magnetic recording head. The magnetic recording head comprises a main pole, a shield, and a spintronic device disposed between the main pole and the shield. The spintronic device comprises a field generation layer (FGL) spaced a distance of about 2 nm to about 3 nm from the main pole, a first spacer layer disposed on the FGL, a spin torque layer (STL) disposed on the first spacer layer, a second spacer layer disposed on the STL, and a negative polarization layer (NPL) disposed between the second spacer layer and the shield. The spintronic device has a length of about 17 nm to about 21. During operation, the STL has a magnetization precession of about 16 degrees to about 170 degrees, and the FGL has a magnetization precession of about 60 degrees to about 70 degrees.
1 . A magnetic recording head, comprising:
a main pole;
a shield disposed adjacent to the main pole; and
a spintronic device disposed between the main pole and the shield, the spintronic device comprising:
a first notch disposed on the main pole;
a negative polarization layer (NPL) disposed on the first notch, the NPL comprising FeCr;
a first spacer layer disposed on the NPL;
a spin torque layer (STL) disposed on the first spacer layer;
a second spacer layer disposed on the STL;
a field generation layer (FGL) disposed on the second spacer layer;
a third spacer layer disposed on the FGL; and
a second notch disposed between and in contact with the third spacer layer and the shield.
2 . The magnetic recording head of claim 1 , wherein the first spacer layer comprises a first sublayer and a second sublayer, the first and second sublayer each individually comprising Cu, Ru, or a combination of one or more of Cu, Ru, and Cr.
3 . The magnetic recording head of claim 1 , wherein the spintronic device has a length of about 17 nm to about 21 nm, and wherein the third spacer layer has a thickness of about 2 nm to about 3 nm.
4 . The magnetic recording head of claim 1 , wherein the first notch comprises a magnetic material and the second notch comprises CoFe.
5 . A magnetic recording system comprising the magnetic recording head of claim 1 .
6 . The magnetic recording system of claim 5 , wherein the magnetic recording system is configured to apply a current to the magnetic recording head such that electrons flow from the main pole, through the spintronic device, to the shield.
7 . The magnetic recording system of claim 5 , wherein the STL is configured to apply torque to the FGL and to provide a direct current assist to enhance a recording field during operation.
8 . A magnetic recording head, comprising:
a main pole;
a shield disposed adjacent to the main pole; and
a spintronic device disposed between the main pole and the shield, the spintronic device comprising:
a first notch disposed in contact with the main pole;
a negative polarization layer (NPL) disposed in contact with the first notch, the NPL comprising FeCr;
a first spacer layer disposed in contact with the NPL;
a spin torque layer (STL) disposed in contact with the first spacer layer;
a second spacer layer disposed in contact with the STL;
a field generation layer (FGL) disposed in contact with the second spacer layer;
a third spacer layer disposed in contact with the FGL; and
a second notch disposed between and in contact with the third spacer layer and the shield, the second notch comprising CoFe.
9 . The magnetic recording head of claim 8 , wherein the FGL is spaced a distance of about 2 nm to about 3 nm from the shield.
10 . The magnetic recording head of claim 8 , wherein the first notch comprises a magnetic material, and wherein the first, second, and third spacer layers each individually comprise a non-magnetic material.
11 . The magnetic recording head of claim 8 , wherein the first spacer layer comprises a first sublayer and a second sublayer, the first and second sublayer each individually comprising Cu, Ru, or a combination of one or more of Cu, Ru, and Cr.
12 . A magnetic recording system comprising the magnetic recording head of claim 8 .
13 . The magnetic recording system of claim 12 , wherein the magnetic recording system is configured to apply a current to the magnetic recording head such that electrons flow from the main pole, through the spintronic device, to the shield.
14 . The magnetic recording system of claim 12 , wherein the STL is configured to apply torque to the FGL and to provide a direct current assist to enhance a recording field during operation.
15 . A magnetic recording head, comprising:
a main pole;
a shield disposed adjacent to the main pole; and
a spintronic device disposed between the main pole and the shield, the spintronic device comprising:
a first notch disposed on the main pole;
a negative polarization layer (NPL) disposed on the first notch, the NPL comprising FeCr;
a first spacer layer disposed on the NPL;
a spin torque layer (STL) disposed on the first spacer layer;
a second spacer layer disposed on the STL;
a field generation layer (FGL) disposed on the second spacer layer, wherein the FGL is spaced a distance of about 2 nm to about 3 nm from the shield;
a third spacer layer disposed on the FGL; and
a second notch disposed between and in contact with the third spacer layer and the shield, wherein the spintronic device has a length of about 17 nm to about 21 nm.
16 . The magnetic recording head of claim 15 , wherein the first notch comprises a magnetic material and the second notch comprises CoFe, and wherein the first, second, and third spacer layers each individually comprise a non-magnetic material.
17 . The magnetic recording head of claim 15 , wherein the first spacer layer comprises a first sublayer and a second sublayer, the first and second sublayer each individually comprising Cu, Ru, or a combination of one or more of Cu, Ru, and Cr.
18 . The magnetic recording head of claim 15 , wherein the FGL has a thickness of about 5 nm to about 10 nm, and wherein the STL has a thickness of about 4 nm to about 6 nm.
19 . A magnetic recording system comprising the magnetic recording head of claim 15 .
20 . The magnetic recording system of claim 19 , wherein the magnetic recording system is configured to apply a current to the magnetic recording head such that electrons flow from the main pole, through the spintronic device, to the shield.
21 . The magnetic recording system of claim 19 , wherein the STL is configured to apply torque to the FGL and to provide a direct current assist to enhance a recording field during operation.