Heat-assisted magnetic recording heads with additional magnetic material
Described are magnetic write heads for heat-assisted magnetic recording (HAMR) in which either or both of the heat sink disk or middle disk of the near field transducer are composed of magnetic materials. In addition, any diffusion barrier layers provided between the write pole and the heat sink or other components may include magnetic materials. Constructing write heads that include magnetic material containing components between the write pole and the near field transducer may result in increased areal density capability (ADC) due to lowering the magnetic field angle, decreasing the magnetic field rise time, and/or increasing the magnetic field strength.
1 . A write head for recording on magnetic media positioned proximate to a media facing surface of the write head, the write head comprising:
a write pole extending proximate to the media facing surface;
a near field transducer disposed adjacent to the write pole, the near field transducer comprising an emitter disk disposed between a middle disk and a sunken disk, a peg extending from the emitter disk toward the media facing surface, and a waveguide configured to deliver electromagnetic radiation to the sunken disk for coupling into the emitter disk; and
a heat sink disposed between the middle disk and the write pole,
wherein one or both of the heat sink and the middle disk is composed of a magnetic material.
2 . The write head of claim 1 , further comprising a diffusion barrier layer disposed between the write pole and the heat sink, the diffusion barrier layer configured to substantially prevent interdiffusion of materials between the write pole and the heat sink.
3 . The write head of claim 1 , further comprising a diffusion barrier layer disposed between the heat sink and the middle disk, the diffusion barrier layer configured to substantially prevent interdiffusion of materials between the heat sink and the middle disk.
4 . The write head of claim 3 , wherein the diffusion barrier is composed of a magnetic material.
5 . The write head of claim 4 , wherein the magnetic material of the diffusion barrier is FeCoX, where X is Ir, Pt, Pd, Rh, Ru, Re, or Os.
6 . The write head of claim 1 , wherein the magnetic material of one or both of the heat sink and the middle disk is an FeCoX alloy.
7 . The write head of claim 6 , wherein X is Ni.
8 . The write head of claim 6 , the FeCoX alloy further includes Cr, Cu, Ta, Nb, or Zr.
9 . The write head of claim 1 , wherein the middle disk is composed of FeCoIr.
10 . The write head of claim 1 , wherein the middle disk is integrated with the write pole.
11 . The write head of claim 1 , further comprising a diffusion barrier layer that extends between the write pole and the near field transducer.
12 . The write head of claim 11 , wherein the diffusion barrier is composed of a magnetic material.
13 . The write head of claim 12 , wherein the magnetic material of the diffusion barrier is FeCoX, where X is Ir, Pt, Pd, Rh, Ru, Re, or Os.
14 . The write head of claim 1 , wherein the write pole is a sloped write pole.
15 . The write head of claim 1 , wherein the write pole is a flat write pole.
16 . The write head of claim 1 , further comprising a peg coupler disposed on a tip of the write pole at the media facing surface.
17 . A hard disk drive comprising the write head of claim 1 .
18 . A write head for recording on magnetic media positioned proximate to a media facing surface of the write head, the write head comprising:
a write pole extending proximate to the media facing surface;
a near field transducer disposed adjacent to the write pole, the near field transducer comprising an emitter disk disposed between a middle disk and a sunken disk, a peg extending from the emitter disk toward the media facing surface, and a waveguide configured to deliver electromagnetic radiation to the sunken disk for coupling into the emitter disk, where the middle disk is composed of a magnetic material; and
a heat sink disposed between the middle disk and the write pole.
19 . The write head of claim 18 , wherein the middle disk is composed of an FeCoX alloy.
20 . The write head of claim 18 , further comprising a diffusion barrier layer disposed between the heat sink and the middle disk.