A Simple And Effective Semi-Circle Resonator System For Bit-Patterned Hamr

The light delivery system with a light spot is the key component of heat-assisted magnetic recording (HAMR). We proposed a semi-circle resonator system as the light delivery system for HAMR. It consists of only a semi-circle resonator, a reflecting mirror, and a near-field transducer (NFT). The resonator can provide a stable enhanced optical field to excite the localized surface plasmon of NFT without complex focusing lenses or external controls. Numerical results show that the size of light spots can be 20-40 nm with a good field enhancement. Combined with bit-patterned media, the performance can be improved several times than the thin-film structure. The thermal profile of the light spot shows that the areal density of HAMR can further improve beyond the limit size of light spots, and the recording bit can be reduced to 12 x 12 nm(2) corresponding to the areal density of about 4 Tb/in(2). (C) 2020 Elsevier B.V. All rights reserved.