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Author: search.filters.author.Chaiduangsri, Nuttapon

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    Influence of Recorded Pattern on Background Interference impact in Magnetic Recording
    (2021-11-05)
    Chaiduangsri, Nuttapon
    ;
    Kaitwanidvilai, Somyot
    ;
    Tongsomporn, Damrongsak
    This paper discusses the impact of background interference on a recorded pattern for heat-assisted magnetic recording technology (HAMR). Several patterns of the background track were examined, with the log bit error rate and signal to noise ratio measured via a spin-stand tester using HAMR head and media. It was found that the low frequency pattern gave the highest BER and SNR loss due to the strong magnetic field from the adjacent tracks. Similar to its practical use, the PRBS pattern also showed high interference. These observations may be used to support HDD areal density growth.
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    Experimental study of media heat sink thickness impact on signal-To-noise ratio in heat-Assisted magnetic recording
    (2020-01-01)
    Kaitwanidvilai, Somyot
    ;
    Chaiduangsri, Nuttapon
    ;
    Tongsomporn, Damrongsak
    Recently, heat-Assisted magnetic recording (HAMR) has been demonstrated to extend the areal density growth over the superparamagnetic limited. One key component of this technology is a heat sink layer in HAMR media, which benefits the thermal gradient and transition noise. However, the disadvantage of the heat sink layer (HS) has not been fully explored. In this paper, we investigate the background interference (BGI) impact as a result of the heat sink layer via the spin-stand tester. HAMR heads included a light delivery system that have measured a signal-To-noise ratio and down-Track thermal gradient on a variety of HS thickness. Subsequently, we found that a thicker HS is a trade-off between the BGI and thermal gradient. Thus, it remains challenging to achieve an ultra-high areal density using the thermal media design.
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    Impact of Background Interference on Signal-To-Noise Ratio in Heat-Assisted Magnetic Recording
    (2018-01-01)
    Kaitwanidvilai, Somyot
    ;
    Chaiduangsri, Nuttapon
    ;
    Tongsomporn, Damrongsak
    We discuss background interference (BGI) arising from the read-back of preexisting data and adjacent tracks on a recording medium. A signal-To-noise ratio analysis is used to measure the impact of BGI in heat-Assisted magnetic recording in a spin-stand tester. The signal-To-noise ratio for a data track with an alternating field background was compared to a data track written over a pair of background tracks. We considered the effect of background track offsets: The distance between the background and data tracks. BGI, which depends on the background track offset, can degrade read-back performance. The dibit extraction technique is able to separate the linear dibit response and the BGI in the read-back waveform.