Presentation Information
[15p-PA1-10]Time-Domain Analysis of Electromagnetic Energy Flow around Near Field Transducer in Heat Assisted Magnetic Recording (HAMR)
〇Ryo Osamura1, Akira Kikitsu1, Yosuke Isowaki1, Shu Yanao2, Seiya Kishimoto2, Shinichiro Ohnuki2 (1.Toshiba Corp., 2.Nihon Univ.)
Keywords:
Hard Disk Dirve,Heat Assisted Magnetic Recording,Surface Plasmon Resonance
Heat Assisted Magnetic Recording (HAMR) is a next-generation technology for high-density data storage. It uses a laser to locally heat the recording medium, enabling precise magnetic writing. In this study, we analyzed how energy is transferred via the near field transducer (NFT) using the ADE-FDTD method. We compared two NFT materials: gold (Au) and aluminum (Al). The results showed that their behaviors are different. Notably, Au exhibited periodic energy exchange between the inside and outside of the NFT, which is caused by surface plasmon resonance (SPR). We also found that the dielectric constant of the gap material between the NFT and the recording medium has a strong impact on the efficiency of energy transfer. These findings help guide the design of HAMR heads and can contribute to improving recording performance.