Abstract
Heat-Assisted Magnetic Recording (HAMR) technology relies on localized laser heating to temporarily reduce the coercivity of magnetic media, allowing data to be written at higher densities compared to older technologies. However, the resolution of heating in HAMR is constrained by the laser spot size and optical diffraction limits, leading to larger-than-desired thermal footprints. This invention leverages laser interference to achieve sub-spot-size localization of heating, inspired by multi-photon photopolymerization techniques. By carefully designing interfering laser beams, a much smaller effective heating area can be achieved, allowing for increased track density and improved data storage capacity.
This approach minimizes unwanted thermal influence between adjacent tracks, enabling higher density without increased energy consumption. Additionally, reduced unnecessary thermal exposure prolongs the longevity of the storage media. This technique offers a scalable solution for next-generation HAMR devices, facilitating further miniaturization of magnetic bits.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Tan, Lisa; Wee, Zi Jian; and Lim, Hock Soon, "Multi-Photon-Assisted Laser Interference Heating for Precision Thermal Control", Technical Disclosure Commons, (April 21, 2025)
https://www.tdcommons.org/dpubs_series/8024