Automatic Design Optimization of Plasmon Antenna for Thermally Assisted Magnetic Recording

• Published in: IEEE transactions on magnetics Vol. 45; no. 10; pp. 3604 - 3607
• Main Authors: Takano, K., Jin, E., Schreck, E., Smyth, J., Dovek, M.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.10.2009; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antennas; Computational modeling; Cross-disciplinary physics: materials science; rheology; Design engineering; Design optimization; Differential equations; Dispersion; Exact sciences and technology; Finite difference method; Finite difference methods; Finite-difference time domain (FDTD); Focusing; Heat-assisted magnetic recording; Magnetic recording; Magnetism; Materials science; Mathematical analysis; Optical recording; Other topics in materials science; Physics; plasmon antenna; Plasmons; Shape; thermally assisted magnetic recording (TAMR); Time domain analysis; waveguide; Design; thermally assisted magnetic recording (TAMR); Finite-difference time domain (FDTD); Waveguides; plasmon antenna; Magnetic recording; Magnetic properties; waveguide
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2009.2023920

We developed auxiliary differential equation finite-difference time-domain (ADE-FDTD) method for dispersive Drude medium, and simulated the optical part of the plasmon antenna (PA) and waveguide (WG) system for thermally assisted magnetic recording (TAMR) heads. To achieve higher efficiency without sacrificing the small spot size, our newly developed automatic computational shape optimization program was carried out for the PA designs with a variety of configurations: no recording media, with-media, with magnetic write pole, and only-PA models. The optimized designs for these cases show an enhancement of the electrical field at the PA tip compared to the initial configuration. In addition, both the PA body as well as the tip affects the performance of the guiding and focusing of the plasmon. However, the optimized detail shape and the sensitivity of the dimension are dependent upon the configuration.