MAMR head with synthetic antiferromagnetic (SAF) coupled notch
Embodiments of the present disclosure generally relate to a write head for a magnetic recording device. The write head includes a spin torque oscillator (STO) that has a seed layer formed on a write pole, a spin polarization layer (SPL) formed on the seed layer, a first spacer layer formed on the SPL, a field generation layer (FGL) formed on the first spacer layer, a second spacer layer formed on the FGL, and a notch formed on the second spacer layer. The FGL and the notch are antiferromagnetically coupled through the second spacer layer and thus increases the FGL angle and improves the write capabilities of the write head.
1. A write head, comprising:
a main pole;
a first spacer layer disposed adjacent the main pole;
a field generation layer (FGL) coupled to the first spacer layer;
a second spacer layer coupled to the FGL;
a notch coupled to the second spacer layer; and
a trailing shield coupled to the notch.
2. The write head of claim 1 , further comprising:
a seed layer coupled to the main pole; and
a spin polarization layer (SPL) coupled to the seed layer, wherein the first spacer layer is disposed on the SPL.
3. The write head of claim 2 , wherein the SPL comprises a multilayer structure.
4. The write head of claim 3 , wherein the multilayer structure comprises a first layer comprising CoMnGe and a second layer comprising CoFe.
5. The write head of claim 1 , wherein the second spacer layer comprises Ru, Rh, Pd, or combinations thereof.
6. The write head of claim 1 , wherein the first spacer layer comprises copper.
7. The write head of claim 1 , wherein the notch comprises CoFe.
8. The write head of claim 1 , wherein the notch is a perpendicular notch.
9. The write head of claim 8 , wherein the second spacer layer comprises a material used for synthetic antiferromagnetic structures.
10. A magnetic recording medium comprising the write head of claim 1 .
11. A write head, comprising:
a main pole;
a trailing shield;
a Fe layer disposed between the main pole and the trailing shield;
a Co layer disposed between the Fe layer and the trailing shield;
a Ru layer disposed between the Co layer and the trailing shield; and
a CoFe layer disposed between the Ru layer and the trailing shield, the CoFe layer being in contact with the trailing shield.
12. The write head of claim 11 , wherein the Co layer and the CoFe layer are antiferromagnetically coupled together.
13. The write head of claim 11 , further comprising a Cu layer disposed between the main pole and the Fe layer.
14. The write head of claim 11 , further comprising a seed layer disposed between the main pole and the Fe layer.
15. The write head of claim 14 , wherein the seed layer comprises ruthenium, copper, tantalum, or combinations thereof.
16. The write head of claim 11 , further comprising a spacer layer disposed between the main pole and the Fe layer.
17. The write head of claim 16 , wherein the spacer layer comprises Au, Ag, Al, Cu, AgSn, NiAl, or combinations thereof.
18. A magnetic recording medium comprising the write head of claim 11 .
19. A write head, comprising:
a main pole;
a trailing shield;
a field generation layer (FGL) disposed between the main pole and the trailing shield;
a notch disposed between the FGL and the trailing shield; and
means to antiferromagnetically couple the FGL to the notch.
20. A magnetic recording medium comprising the write head of claim 19 .
21. The write head of claim 11 , wherein the CoFe layer is directly in contact with the trailing shield.