The Effect of Chaotic Laser beam on near field transducers for Heat assisted magnetic recording

摘要

The purpose of this paper is to demonstrate the effects of chaos generated in semiconductor laser with external cavity feedback. Chaotic states of a semiconductor laser with external cavity feedback mirror are generated by varying external feedback strength between 0-3ns-1, which is a function of reflectivity of mirror. To study chaos, Bifurcation, Temporal waveform, and Attractor are used. The results of chaotic states affect near-field. We showed comparisons with stable, periodic, and chaotic states that change the electrical field around 50x50 nm of C-shaped near-field transducer (NFT) by using a semiconductor laser, 830 nm at 50 nanosecond. The effects of chaotic state decrease the electrical field around a near-field transducer. It is very important in the light delivery system designs, which are the components of a heat assisted magnetic recording system

Keywords: Chaotic laser beam, Heat assisted magnetic recording, Near-field transducers