Light Delivery System for Heat-Assisted Magnetic Recording

Abstract

Heat-assisted magnetic recording (HAMR) technology needs a light delivery system with an incorporated near-field transducer (NFT) as a minute heat generator. A novel system for light delivery with a triangular spot size converter (SSC) and an optical fiber is proposed. The advantages of using a triangular SSC are optical efficiency and integration tolerance between the optical fiber and the NFT. It also has good affinity to conventional head fabrication process. The optical fiber enables flexible laser location. It was confirmed that fabricated triangular SSC can propagate light and reduce beam spot. Computer simulations and experiments demonstrated possibility of integration of light delivery system between NFT, SSC, and optical fiber. Flyability of a pico slider with an optical fiber was also demonstrated. It shows that the optical fiber does not have a big impact on flyability below 10 nm flying height and off-track vibration.Index Terms-Heat-assisted magnetic recording (HAMR), light delivery, near-field transducer, spot size converter.

Design and Modeling of the Photonic Crystal Waveguide Structure for Heat‐Assisted Magnetic Recording

“…Specifically, CT, CB, and CO increase from 88.6% to 97.2%, 59.8% to 72.2%, and 53.8% to 60.8%, respectively. Note that the obtained overall transmission efficiency from the MOD#5 case is better than those reported previously [24][25][26]. To further improve the transmission efficiency, a systematic approach should be implemented.…”

“…e capability of the PC to manipulate light as described above suggests the use of the PC structure as a potential candidate for light delivery in the heat-assisted magnetic recording (HAMR) system [24]. Several HAMR light delivery systems have been proposed, for example, the structure consisting of grating, slab waveguide, and near-field transducer (NFT) [24], the fiber optic connected with a spot-size converter (SSC) [25], and the butt-grating structure associated with multilayer core and cladding [26]. ese proposed light deliveries, however, suffer from power losses at different locations and produce less than 50% transmission efficiency.…”

Plasmonic near-field transducer for heat-assisted magnetic recording

“…The dimensions of both the resonator and the sharp feature need to be optimized to achieve the best energy coupling efficiency. Common designs include triangle antenna [28,29] and triangle aperture [30,31], C aperture [32][33][34][35][36], bowtie antenna [37][38][39][40] and bowtie aperture [15,23,[41][42][43][44].…”

Study of Flying Stability of a Thermally Assisted Magnetic Recording System with Laser Diode Mount Light Delivery

“…TAMR efficiency and the areal density of the TAMR system depend on laser spot size. 11,[14][15][16][17] Given a certain energy from the LD, when the light is focused to a small spot size, the energy of the laser becomes concentrated in this small area. Thus, the temperature of the medium increases in this area.…”