Open AccessOptical property study of FePt-C nanocomposite thin film for heat-assisted magnetic recording
Author(s) -
Z. H. Cen,
Baoxi Xu,
Jingtian Hu,
J. M. Li,
K. M. Cher,
Ying Xiu Toh,
K. D. Ye,
J. Zhang
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.009906
Subject(s) - materials science , thin film , refractive index , heat assisted magnetic recording , nanocomposite , molar absorptivity , substrate (aquarium) , sputtering , ellipsometry , optics , attenuation coefficient , absorption (acoustics) , wavelength , optical coating , optoelectronics , sputter deposition , composite material , transducer , nanotechnology , oceanography , physics , quantum mechanics , geology
Optical properties of the FePt-C nanocomposite thin film that was synthesized by sputtering with MgO/NiTa underlayer on glass substrate have been determined by an approach combining spectroscopic ellipsometry and transmission over the wavelength range of 380 - 1700 nm. It was observed that the refractive index is larger than the extinction coefficient, indicating that free electron absorption is not the dominant optical transition in the FePt-C thin film. Compared with FePt thin film, the FePt-C thin film has smaller optical constants, which lead to better optical performance including smaller optical spot on recording media and higher transducer efficiency for heat assisted magnetic recording.