Nanocavity Induced Light Concentration for Energy Efficient Heat Assisted Magnetic Recording Media
Abstract
Enhancing light absorption in the recording media layer can improve the energy efficiency and prolong the device lifetime in heat assisted magnetic recording (HAMR). In this work, we report the design and implementation of a resonant nanocavity structure to enhance the light-matter interaction within an ultrathin FePt layer. In a Ag/SiO2/FePt trilayer structure, the thickness of the dielectric SiO2 layer is systematically tuned to reach maximum light absorption at the wavelength of 830 nm. In the optimized structure, the light reflection is reduced by more than 50%. This results in effective laser heating of the FePt layer, as imaged by an infrared camera. The scheme is highly scalable for thinner FePt layers and shorter wavelengths to be used in future HAMR technologies.
Keywords
Cite
@article{arxiv.1806.04926,
title = {Nanocavity Induced Light Concentration for Energy Efficient Heat Assisted Magnetic Recording Media},
author = {Chenhua Denga and Haomin Song and James Parry and Yihao Liu and Shuli He and Xiaohong Xu and Qiaoqiang Gan and Hao Zeng},
journal= {arXiv preprint arXiv:1806.04926},
year = {2018}
}
Comments
15 pages, 6 figures