Magnetic head with spin oscillation device(s) and magnetic recording device
It is made possible to provide a magnetic head that generates a sufficient high-frequency magnetic field for assisting recording operations, and a magnetic recording device that includes the magnetic head. A magnetic head includes: a recording magnetic pole; a return yoke magnetically coupled to the recording magnetic pole; and at least two spin torque oscillators provided near the recording magnetic pole.
1. A magnetic head comprising:
a recording magnetic pole;
a return yoke magnetically coupled to the recording magnetic pole; and
at least two spin torque oscillators provided on a first plane parallel with a medium facing plane of the recording magnetic pole and arranged in parallel with each other, the spin torque oscillators being disposed between a face of the recording magnetic pole on one side of a gap and a face of the return yoke on another side of the gap, the gap being between the recording magnetic pole and the return yoke, and the spin torque oscillators being respectively disposed on opposite sides of a center line of the recording magnetic pole, the center line extending across the gap.
2. The head according to claim 1 , wherein the spin torque oscillators are disposed in positions substantially symmetrical about the center line of the recording magnetic pole.
3. The head according to claim 1 , further comprising
a write shield disposed between the recording magnetic pole and the return yoke, the gap being formed between the recording magnetic pole and the write shield.
4. The head according to claim 3 , further comprising
a side shield that is provided at either side portion of the recording magnetic pole.
5. The head according to claim 1 , wherein each of the spin torque oscillators has a pair of electrodes for energization, one of the electrodes being electrically connected to the recording magnetic pole.
6. The head according to claim 1 , wherein the spin torque oscillators are disposed in positions closer to the return yoke than to the recording magnetic pole.
7. The head according to claim 1 , wherein each of the spin torque oscillators is a stacked structure that includes a first magnetic layer, a second magnetic layer, an intermediate layer, and a third magnetic layer.
8. A magnetic recording device comprising the magnetic head according to claim 1 .
9. The device according to claim 8 , wherein the spin torque oscillators are disposed in positions substantially symmetrical about the center line of the recording magnetic pole.
10. The device according to claim 8 , further comprising
a write shield that is provided between the recording magnetic pole and the return yoke, the gap being formed between the recording magnetic pole and the write shield.
11. The device according to claim 10 , further comprising
a side shield that is provided at either side portion of the recording magnetic pole.
12. The device according to claim 8 , wherein each of the spin torque oscillators has a pair of electrodes for energization, one of the electrodes being electrically connected to the recording magnetic pole.
13. The device according to claim 8 , wherein the spin torque oscillators are placed in positions closer to the return yoke than to the recording magnetic pole.
14. The device according to claim 8 , wherein each of the spin torque oscillators is a stacked structure that includes a first magnetic layer, a second magnetic layer, an intermediate layer, and a third magnetic layer.
15. A magnetic head, comprising:
a recording magnetic pole;
a return yoke magnetically coupled to the recording magnetic pole; and
at least two spin torque oscillators provided on a first plane parallel with a medium facing plane of the recording magnetic pole and arranged in parallel with each other,
wherein the spin torque oscillators are respectively disposed in vicinities of two side faces of the recording magnetic pole, the two side faces not including a first face of the recording magnetic pole on one side of a gap between the recording magnetic pole and the return yoke, and the two side faces also not including a second face of the recording magnetic pole opposite from the magnetic gap.
16. A magnetic recording device comprising the magnetic head according to claim 15 .