Wrap-around antenna design for improved performance in thermally-assisted magnetic recording
View Patent ↗The presented embodiments generally relate to designing an antenna of an optical transducer (e.g., a near-field transducer or near-field optical source) that focuses the optical energy of a radiation source (e.g., a laser) onto a magnetic media, thereby heating the media. Specifically, the antenna is designed to wrap-around an aperture of the optical transducer such that at least a portion of the antenna is between a main pole of a write head and a surface of the aperture that faces the main pole. Moreover, the antenna may wrap-around the aperture such that it directly contacts the main pole.
1. A method of fabricating an optical transducer configured to heat a magnetic media proximate to a head of a disk drive, the method comprising:
depositing a first portion of an antenna of the optical transducer;
forming an aperture of the optical transducer, the aperture disposed between the first portion of the antenna and a main pole of the head; and
after depositing the first portion of the antenna and forming the aperture, depositing a second portion of the antenna, wherein the second portion of the antenna extends past, in a direction towards the main pole, a surface of the aperture that faces the main pole.
2. The method of claim 1 , wherein at least part of the second portion of the antenna is disposed between the surface of the aperture and the main pole.
3. The method of claim 1 , wherein the antenna comprises at least one of Ag, Au, Rh, and alloys thereof.
4. The method of claim 1 , further comprising:
depositing an adhesion material on the surface of the aperture, wherein the adhesion material contacts both the second portion of the antenna and the surface of the aperture.
5. The method of claim 4 , wherein the adhesion material does not separate the first portion of the antenna from the second portion of the antenna.
6. The method of claim 4 , wherein the adhesion material is between 0.01 nm and 4 nm thick and comprises at least one of: Cr, Ta, Ti, Pd, Si, and alloys thereof.
7. The method of claim 1 , further comprising forming a heat sink, wherein the second portion of the antenna is disposed between the aperture and the heat sink, and wherein a dimension of the first portion between the aperture and the heat sink is at least 30 nm.
8. The method of claim 1 , wherein a material in the aperture comprises an electrically insulative and optically transparent material.
9. The method of claim 1 , wherein a material of the second portion is different from a material of the first portion.
10. The method of claim 1 , further comprising depositing a diffusion prevention layer directly between the aperture and the main pole.
11. A method of fabricating an optical transducer configured to heat a magnetic media proximate to a head of a disk drive, the method comprising:
depositing a first portion of an antenna of the optical transducer;
forming an aperture of the optical transducer, the aperture disposed between the first portion of the antenna and a main pole of the head; and
after depositing the first portion of the antenna and forming the aperture, depositing a second portion of the antenna, wherein the second portion contacts the main pole.
12. A head of a disk drive, comprising:
an optical transducer configured to heat a magnetic media proximate to the head, the optical transducer comprising:
an antenna;
an aperture disposed between a first portion of the antenna and a main pole of the head, wherein a second portion of the antenna extends past, in a direction towards the main pole, a surface of the aperture that faces the main pole; and
an adhesion material disposed between the second portion of the antenna and the surface of the aperture, the adhesion material contacting both the second portion and the surface.
13. The head of claim 12 , wherein at least a part of the second portion of the antenna is disposed between the surface of the aperture and the main pole.
14. The head of claim 12 , wherein the antenna comprises at least one of Ag, Au, Rh, and alloys thereof.
15. The head of claim 12 , wherein the adhesion material is disposed between the first portion and the second portion such that both the first and second portions contact the adhesion material.
16. The head of claim 12 , wherein the adhesion material does not separate the first portion of the antenna from the second portion of the antenna.
17. The head of claim 12 , wherein the adhesion material is between 0.01 nm and 4 nm thick and comprises at least one of: Cr, Ta, Ti, Pd, Si, and alloys thereof.
18. The head of claim 12 , further comprising a heat sink, wherein the second portion of the antenna is disposed between the aperture and the heat sink, and wherein a dimension of the first portion between the aperture and the heat sink is at least 30 nm.
19. The head of claim 12 , wherein the aperture comprises an electrically insulative and optically transparent material.
20. The head of claim 12 , wherein a material of the second portion is different from a material of the first portion.