Tapered magnetic main pole structure with variable peg gap for heat-assisted magnetic recording technology
Writer head products for heat-assisted magnetic recording devices and methods of making the same are disclosed. The writer heads include multiple layers including a waveguide blocking layer, a waveguide layer, a near-field transducer layer, a heat sink layer, and a peg layer. The peg layer may comprise a small triangular section that extends from an air-bearing surface into the optical component. The writer heads further include a main magnetic pole adjacent to the optical component.
1 . A writer head for a heat-assisted magnetic recording (HAMR) device, the writer head comprising:
an optical component including:
a triangular layer having a tapered edge;
a first cladding layer positioned adjacent to the triangular layer;
a waveguide (WG) layer positioned adjacent to the first cladding layer;
a second cladding layer positioned adjacent to the WG layer;
a near field transducer (NFT) layer positioned adjacent to the second cladding layer;
a heat sink layer positioned adjacent to the NFT layer; and
a triangular peg gap layer positioned adjacent to the heat sink layer and comprising a tapered angle of about 20 degrees to about 70 degrees; and
a magnetic main pole positioned adjacent to the triangular peg gap layer and the heat sink layer and having a saturation magnetization of about 24 kG or greater.
2 . The writer head of claim 1 , wherein a surface of the magnetic main pole includes a tapered angle equal to the tapered angle of the triangular peg gap layer.
3 . The writer head of claim 1 , wherein a surface of the magnetic main pole opposite the tapered peg gap layer includes a flat surface.
4 . The writer head of claim 1 , wherein a surface of the magnetic main pole opposite the tapered peg gap layer includes a taper comprising an angle equal and opposite to the angle of the triangular peg gap layer.
5 . The writer head of claim 1 , wherein a surface of the magnetic main pole opposite the tapered peg gap layer includes a slope with an angle of about −15 degrees to about −45 degrees.
6 . The writer head of claim 1 , wherein a surface of the magnetic main pole opposite the tapered peg gap layer includes a slope with an angle of about −15 degrees to about −45 degrees and wherein the surface of the heat sink layer contacting the magnetic main pole includes a taper with an angle of about −15 degrees to about −45 degrees.
7 . The writer head of claim 1 , wherein the magnetic main pole includes a first layer adjacent to the peg gap layer and a second layer adjacent to the first layer wherein the first layer includes a lower magnetic moment than the second layer.
8 . The writer head of claim 7 , wherein the first layer has a thickness of about 10 nm to about 50 nm.
9 . The writer head of claim 7 , wherein the first layer includes one or more of CoFe, NiFe, CoFeNi and a dopant comprising a transition metal.
10 . The writer head of claim 9 , wherein the dopant includes one or more of palladium or rhenium.
11 . The writer head of claim 1 , wherein the triangular layer includes a waveguide blocking layer comprising ruthenium.
12 . The writer head of claim 1 , wherein the triangular layer includes one or more of alumina or silica.
13 . The writer head of claim 1 , wherein the NFT layer includes a first NFT layer comprising a first metal and a second NFT layer comprising a transition metal,
wherein the first NFT layer includes one or more of gold, silver, copper, alloys thereof, graphene, and a metal oxide; and
wherein the second NFT layer includes one of Rh or Ir.
14 . The writer head of claim 1 , wherein the heat sink layer includes one or more of gold, ruthenium, aluminum nitride, or silicon carbide.
15 . The writer head of claim 1 , wherein the optical component further includes a laser diode configured to generate a beam of light.
16 . The writer head of claim 1 , further comprising:
a magnetic component that includes a first return pole operably connected to the main magnetic pole by a first connector and positioned on a side of the main magnetic pole opposite of the optical component.
17 . The writer head of claim 16 , wherein the magnetic component further includes a coil comprising between 0 and 6 loops, wherein the coil is positioned between the first return pole and the main magnetic pole.
18 . The writer head of claim 16 , wherein the distance between the first return pole and the main magnetic pole is about 50 nm to about 1,000 nm.
19 . The writer head of claim 16 , wherein the first return pole has a thickness of about 500 nm to about 1,500 nm.
20 . The writer head of claim 16 , wherein the first return pole includes a first pedestal with a thickness of about 1.5 μm to about 2.5 μm and a height of about 200 nm to about 1,000 nm.
21 . The writer head of claim 16 , wherein the first return pole further includes a first magnetic leading shield (MLS) having a thickness of about 100 nm to about 1,000 nm and a height of about 500 nm to about 2,000 nm.
22 . The writer head of claim 16 , wherein the magnetic component includes a first yoke positioned between the first connector and the main magnetic pole.
23 . The writer head of claim 16 , wherein the main magnetic pole includes a sloped back edge having an angle of about 15 degrees to about −75 degrees.
24 . The writer head of claim 16 , wherein the magnetic component includes a second return pole operably connected to the main magnetic pole by a second connector and positioned on a side of the main magnetic pole opposite of the first return pole.
25 . The writer head of claim 24 , wherein the distance between the second return pole and the main magnetic pole is about 100 nm to about 1,000 nm.
26 . The writer head of claim 24 , wherein the second return pole has a thickness of about 100 nm to about 1,500 nm.
27 . The writer head of claim 24 , wherein the second return pole includes a second pedestal with a thickness of about 1.5 μm to about 2.5 μm and a height of about 200 nm to about 1,000 nm.
28 . The writer head of claim 24 , wherein the second return pole further includes a second magnetic leading shield (MLS) having a thickness of about 100 nm to about 800 nm and a height of about 500 nm to about 1,000 nm.
29 . The writer head of claim 24 , wherein the magnetic component further includes a first coil and a second coil, wherein the first coil and the second coil combined comprise between 0 and 6 loops, wherein the first coil is positioned between the first return pole and the main magnetic pole, wherein the second coil is positioned between the second return pole and the main magnetic pole, and wherein the first coil and the second coil comprise the same number of loops.