Laser-ignited reactive HAMR bonding
View Patent ↗The present disclosure generally relates to a HAMR head and a method for fabrication thereof. The HAMR head has a write head with a waveguide extending therethrough. A laser diode is coupled to a submount that is bonded to the write head using an adhesion layer, a solder structure, and a self-propagating multilayer alloying stack.
1. A magnetic recording head, comprising:
a slider body;
a write head coupled to the slider body, the write head having an air bearing surface and a second surface opposite the air bearing surface, the write head including:
a near field transducer disposed at the air bearing surface; and
a waveguide extending from the second surface to the near field transducer;
a submount coupled to the slider body;
a laser diode coupled to the submount and aligned with the waveguide such that light emitted from the laser diode is directed to the waveguide;
a solder structure coupled between the submount and the slider body;
an adhesion layer coupled between the slider body and the solder structure; and
a self-propagating, multilayer alloying stack disposed between one of the following:
the adhesion layer and the solder structure; or
the solder structure and the submount.
2. The magnetic recording head of claim 1 , wherein the self-propagating, multilayer alloying stack comprises alternating layers of nickel and aluminum.
3. The magnetic recording head of claim 2 , wherein the solder structure comprises alternating layers of gold and tin.
4. The magnetic recording head of claim 3 , wherein the self-propagating, multilayer alloying stack has a thickness of between about ⅛ to about ⅙ a thickness of the solder structure.
5. The magnetic recording head of claim 4 , wherein the adhesion layer comprises gold.
6. The magnetic recording head of claim 5 , wherein a first layer of the self-propagating, multilayer alloying stack that is in contact with the adhesion layer comprises nickel.
7. The magnetic recording head of claim 6 , wherein a topmost layer of the self-propagating, multilayer alloying stack that is in contact with the solder structure comprises aluminum.
8. The magnetic recording head of claim 1 , wherein the self-propagating, multilayer alloying stack comprises an even number of layers with a total number of layers being greater than 2 and wherein each layer has a thickness of between about 40 nm and about 55 nm.
9. A hard disk drive, comprising:
a disk drive body having an enclosure;
a magnetic recording medium disposed within the enclosure;
a magnetic recording head disposed within the enclosure, the head comprising:
a slider body;
a write head coupled to the slider body, the write head having an air bearing surface and a second surface opposite the air bearing surface, the write head including:
a near field transducer disposed at the air bearing surface; and
a waveguide extending from the second surface to the near field transducer;
a submount coupled to the slider body;
a laser diode coupled to the submount and aligned with the waveguide such that light emitted from the laser diode is directed to the waveguide;
a solder structure coupled between the submount and the slider body;
an adhesion layer coupled between the slider body and the solder structure; and
a self-propagating, multilayer alloying stack disposed between one of the following:
the adhesion layer and the solder structure; or
the solder structure and the submount.
10. The hard disk drive of claim 9 , wherein the self-propagating, multilayer alloying stack comprises alternating layers of nickel and aluminum.
11. The hard disk drive of claim 10 , wherein the solder structure comprises alternating layer of gold and tin.
12. The hard disk drive of claim 11 , wherein the self-propagating, multilayer alloying stack has a thickness of between about ⅛ to about ⅙ a thickness of the solder structure.
13. The hard disk drive of claim 12 , wherein the adhesion layer comprises gold.
14. The hard disk drive of claim 13 , wherein a first layer of the self-propagating, multilayer alloying stack that is in contact with the adhesion layer comprises nickel.
15. The hard disk drive of claim 14 , wherein a topmost layer of the self-propagating, multilayer alloying stack that is in contact with the solder structure comprises aluminum.
16. The hard disk drive of claim 9 , wherein the self-propagating, multilayer alloying stack comprises an even number of layers with a total number of layers being greater than 2 and wherein each layer has a thickness of between about 40 nm and about 55 nm.
17. A method of making a magnetic recording head, comprising:
depositing an adhesion layer over a slider having a write head coupled thereto, the write head having a waveguide extending therethrough;
depositing a self-propagating, multilayer alloying stack over the slider;
depositing a solder structure over the adhesion layer;
disposing a submount on the solder structure, the submount having a laser diode coupled thereto;
directing the laser towards the waveguide; and
igniting the self-propagating, multilayer alloying stack to bond the submount to the slider, wherein the self-propagating, multilayer alloying stack is disposed in one of the following locations:
between the adhesion layer and the solder structure; or
between the solder structure and the submount.
18. The method of claim 17 , wherein directing the laser at the waveguide comprises:
directing the laser at the waveguide for a first period of time at a first power level to align the laser relative to the waveguide; and
directing the laser at the waveguide for a second period of time that is less than the first period of time and at a second power level that is greater than the first power level.
19. The method of claim 18 , wherein the self-propagating, multilayer alloying stack comprises alternating layer of nickel and aluminum.
20. The method of claim 19 , wherein the self-propagating, multilayer alloying stack has a thickness of between about ⅛ to about ⅙ a thickness of the solder structure.