R&D: Simple and Effective Semi-Circle Resonator System for bit-Patterned HAMR

Physics Letters A has published an article written by Wei Chen, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China, Jincai Chen, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China, Key Laboratory of Information Storage System, Engineering Research Center of Data Storage Systems and Technology, Ministry of Education of China, Wuhan 430074, China, and School of Computer Science & Technology, Huazhong University of Science & Technology, Wuhan 430074, China, Zongsong Gan, Yaxiong Ma, Ke Luo, Zhenxing Huang, Yang He, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China, and PingLu, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China, Key Laboratory of Information Storage System, Engineering Research Center of Data Storage Systems and Technology, Ministry of Education of China, Wuhan 430074, China, and School of Computer Science & Technology, Huazhong University of Science & Technology, Wuhan 430074, China.

Abstract: “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 nm² corresponding to the areal density of about 4Tb/in²^.“