Understanding Transition and Remanence Noise in HAMR

Jiao, Yipeng; Hohlfield, Julius; Victora, R. H.

doi:10.1109/tmag.2018.2841859

Cited by 7 publications

(3 citation statements)

References 14 publications

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“…This method is useful for understanding the effect of media properties and recording conditions in HAMR systems. [26][27][28][29][30] The detailed test procedures are explained as follows:…”

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%

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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“…w As expected, both remanence and transition SNR can be improved by increasing the magnetic write field. 20) Figure 8(b) shows BER and LD capability at a constant BER versus the estimated H .…”

Section: Test Verification: Distance Between Nft and Writer Polementioning

confidence: 99%

Magnetic write field characterization in heat-assisted magnetic recording systems

Kampun

Lekawat

Tongsomporn³

2020

Jpn. J. Appl. Phys.

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Magnetic write field is a critical factor in determining the quality of the magnetic write transitions, which determine the linear density (LD) limit in heat-assisted magnetic recording (HAMR). We introduce a reversed DC band approach as a simple, no extra-hardware-Required technique in a spin-stand to assess the magnetic write field ( ) contributions, independently in an HAMR system. Heads with different distances between near-field transducer and writer pole, and media with and without soft magnetic under layer were characterized. The estimated result strongly correlates with LD and signal-to-noise ratio, which agrees with previous modeling studies. These results give insight into the head/component required to optimize the HAMR’s system performance. The technique provides qualitative ranking of magnetic write fields and recording temperature, as well as laser operating current at Curie temperature for head/component designs.

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“…Just like all innovations, HAMR also brings many new technological challenges, some of which have become the driving force for studies that advance our understanding of new recording physics and directly provide possible solutions. In particular, micromagnetic modeling work carried out over the past 15 years has unveiled some of the important insights on HAMR recording processes [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

The Scaling of Signal-to-Noise in Heat-Assisted Magnetic Recording

Zhu

2024

IEEE Trans. Magn.

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This paper presents a systematic micromagnetic modeling study on recording characteristics in heat assisted magnetic recording. Utilizing a novel micromagnetic model developed based on the L10 ordering atomic structure of the FePt grains, the study shows that the medium noise caused by grain-to-grain Curie temperature variations can be effectively suppressed with sufficiently high thermal recording gradient along with sufficient head field amplitude. The rest of the paper focuses on the thermal noise and its correlations with various recording parameters.

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Understanding Transition and Remanence Noise in HAMR

Cited by 7 publications

References 14 publications

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

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

Magnetic write field characterization in heat-assisted magnetic recording systems

The Scaling of Signal-to-Noise in Heat-Assisted Magnetic Recording

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