NDLI: Simulation Study of Pulse Laser Quality Effects on Recording Performances of Heat-Assisted Magnetic Recording by Short-Pulse Laser Heating

Content Provider	IEEE Xplore Digital Library
Author	Baoxi Xu Hongtao Wang Zhanhong Cen Zhejie Liu Kaidong Ye Hongzhi Yang Jing Zhang Jianming Li
Copyright Year	1965
Abstract	In heat-assisted magnetic recording (HAMR), a higher recording density is pursued. Short-pulse laser heating is a good way to improve the thermal distribution in the media and to reach the full potential of recording density for the HAMR technology. In this paper, the effects of short-pulse laser qualities, such as pulse frequency deviation, pulse power deviation, and pulsewidth deviation, on recording performances for the HAMR with 100 ps pulse laser heating have been analyzed by simulation. The results indicated that the frequency jitter has the most significant effect on the recording performance among these three parameters. The decreases of signal-to-noise ratio (SNR) for 6% deviations of pulse frequency, pulse power, and pulsewidth are 5, 2, and 1.5 dB, respectively. A certain degree phase delay of pulse laser related to magnetic field switching time is beneficial to reducing the effect of pulse frequency deviation on SNR. When the phase delay changes from 0° to 180°, an SNR improvement of ~2 dB is obtained. The measurement result of a real laser diode output (pulsewidth of 97 ps and pulse frequency of 2 GHz) by gain-switching technology presents a very low frequency deviation (<;0.5%). It indicates that the gain-switching technology is a suitable approach for a short-pulse laser generation for the HAMR application.
Sponsorship	IEEE Magnetics Society
Starting Page	1
Ending Page	5
Page Count	5
File Size	2625343
File Format	PDF
ISSN	00189464
Volume Number	51
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic fields Lasers Delays Signal to noise ratio Media Heating Jitter micromagnetic simulation Heat-assisted magnetic recording magnetic recording media thermal response of media short pulse laser semiconductor laser Heat-assisted magnetic recording (HAMR) short-pulse laser
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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