Magnetic head, disk drive with the same and method of manufacturing magnetic head
According to one embodiment, a magnetic head includes an air bearing surface, a first surface on which contact pads connected to elements are provided, a pair of second surfaces provided respectively with a connection terminal connected to the contact pad, a main pole with a distal end portion extending to the air bearing surface, a write shield opposing the distal end portion of the main pole with a write gap therebetween, and a high-frequency oscillator provided between the main pole and the write shield within the write gap and electrically connected to the main pole and the write shield. The high-frequency oscillator includes a spin injection layer and an oscillation layer, and at least the oscillation layer is recessed in a direction away from the air bearing surface.
1. A magnetic head assembly comprising:
a slider comprising an air bearing surface, a first surface crossing the air bearing surface, and a second surface crossing the air bearing surface;
a main pole in the slider, configured to produce a magnetic field for recording and comprising a distal end portion extending to the air bearing surface;
a write shield in the slider, opposing the distal end portion of the main pole with a write gap therebetween;
a high-frequency oscillator provided between the main pole and the write shield within the write gap and electrically connected to the main pole and the write shield, the high-frequency oscillator comprising a spin injection layer and an oscillation layer stacked one on another, and at least the oscillation layer being recessed in a direction away from the air bearing surface with respect to the main pole and the write shield;
a contact pad provided on the first surface and electrically connected to the high-frequency oscillator; and
a connection terminal provided on the second surface and electrically connected to the high-frequency oscillator to supply electricity to the high-frequency oscillator,
wherein the write gap is formed to be 30 nm or less, and the oscillation layer is recessed by 1 nm or more; and
where a length of the write gap is represented by Lwg (nm) and a depth of recess of the oscillation layer from the air bearing surface is represented by rh (nm), the depth rh satisfies a relationship:
(−0.00407× Lwg 2+0.0934× Lwg+ 1.1)< rh< 9.
2. The magnetic head assembly of claim 1 , wherein the connection terminal is electrically connected to the high-frequency oscillator through the main pole and the write shield.
3. The magnetic head assembly of claim 1 , further comprising a heater configured to heat vicinities of the main pole and the write shield, and electrically connected to the connection terminal.
4. The magnetic head assembly of claim 1 , further comprising a coil around a magnetic core including the main pole and the write shield and electrically connected to the connection terminal.
5. A disk drive comprising:
a disk-shaped recording medium comprising a magnetic recording layer; and
a magnetic head assembly configured to record data on the recording medium, the magnetic head assembly comprising:
a slider comprising an air bearing surface, a first surface crossing the air bearing surface, and a second surface crossing the air bearing surface;
a main pole in the slider, configured to produce a magnetic field for recording and comprising a distal end portion extending to the air bearing surface;
a write shield in the slider, opposing the distal end portion of the main pole with a write gap therebetween;
a high-frequency oscillator provided between the main pole and the write shield within the write gap and electrically connected to the main pole and the write shield, the high-frequency oscillator comprising a spin injection layer and an oscillation layer stacked one on another, and at least the oscillation layer being recessed in a direction away from the air bearing surface with respect to the main pole and the write shield;
a contact pad provided on the first surface and electrically connected to the high-frequency oscillator; and
a connection terminal provided on the second surface and electrically connected to the high-frequency oscillator to supply electricity to the high-frequency oscillator;
wherein the write gap is formed to be 30 nm or less, and the oscillation layer is recessed by 1 nm or more; and
wherein a length of the write gap is represented by Lwg (nm) and a depth of recess of the oscillation layer from the air bearing surface is represented by rh (nm), the depth rh satisfies a relationship:
(−0.00407× Lwg 2+0.0934× Lwg+ 1.1)< rh< 9.
6. The disk drive of claim 5 , wherein the connection terminal is electrically connected to the high-frequency oscillator through the main pole and the write shield.