Impact of Background Interference on Signal-to-Noise Ratio in Heat-Assisted Magnetic Recording

Kaitwanidvilai, Somyot; Chaiduangsri, Nuttapon; Tongsomporn, Damrongsak

doi:10.1109/lmag.2018.2873536

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2020

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“…In the case of the triple tracks, we recorded the neighboring tracks for a 100% offset of the track width-to-face with the maximum SNR loss from side reading. 25) In our experiment, the spin-stand tester measures the SNR to analyze a recording head and media characteristic. This method is useful for understanding the effect of media properties and recording conditions in HAMR systems.…”

Section: Experimental Methodsmentioning

confidence: 99%

Experimental study of media heat sink thickness impact on signal-to-noise ratio in heat-assisted magnetic recording

Kaitwanidvilai

Chaiduangsri

Tongsomporn³

2020

Jpn. J. Appl. Phys.

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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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Section: Experimental Methodsmentioning

confidence: 99%