Micromagnetic Study of Media Noise Plateau in Heat-Assisted Magnetic Recording

Wei Heng Hsu; R. H. Victora

doi:10.1109/TMAG.2018.2881098

Micromagnetic Study of Media Noise Plateau in Heat-Assisted Magnetic Recording

Wei Heng Hsu
, R. H. Victora

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

The relationship between integrated media noise power and linear density in heat-Assisted magnetic recording (HAMR) is discussed. A noise plateau for intermediate recording density has been observed in HAMR, similar to that found in perpendicular magnetic recording (PMR). Here, we show, by changing the temperature profile of the heat spot in HAMR, that we can tune the noise plateau regions to different recording densities. The heat spot with sharp temperature gradient favors a plateau at high recording density, while the heat spot with gradual temperature gradient favors a plateau at low recording density. This effect is argued to be a consequence of the competition between transition noise and remanence noise in HAMR.

Original language	English (US)
Article number	8556393
Journal	IEEE Transactions on Magnetics
Volume	55
Issue number	2
DOIs	https://doi.org/10.1109/TMAG.2018.2881098
State	Published - Feb 2019

Bibliographical note

Funding Information:
ACKNOWLEDGMENT The authors would like to thank Z. Liu, A. Venugopal, and N. A. Natekar for useful discussion. They would also like to thank Western Digital Corporation for funding this project.

Publisher Copyright:
© 1965-2012 IEEE.

Keywords

Heat-Assisted magnetic recording (HAMR)
media noise
micromagnetic simulation
recording physics

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10.1109/TMAG.2018.2881098

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title = "Micromagnetic Study of Media Noise Plateau in Heat-Assisted Magnetic Recording",

abstract = "The relationship between integrated media noise power and linear density in heat-Assisted magnetic recording (HAMR) is discussed. A noise plateau for intermediate recording density has been observed in HAMR, similar to that found in perpendicular magnetic recording (PMR). Here, we show, by changing the temperature profile of the heat spot in HAMR, that we can tune the noise plateau regions to different recording densities. The heat spot with sharp temperature gradient favors a plateau at high recording density, while the heat spot with gradual temperature gradient favors a plateau at low recording density. This effect is argued to be a consequence of the competition between transition noise and remanence noise in HAMR.",

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AB - The relationship between integrated media noise power and linear density in heat-Assisted magnetic recording (HAMR) is discussed. A noise plateau for intermediate recording density has been observed in HAMR, similar to that found in perpendicular magnetic recording (PMR). Here, we show, by changing the temperature profile of the heat spot in HAMR, that we can tune the noise plateau regions to different recording densities. The heat spot with sharp temperature gradient favors a plateau at high recording density, while the heat spot with gradual temperature gradient favors a plateau at low recording density. This effect is argued to be a consequence of the competition between transition noise and remanence noise in HAMR.

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KW - media noise

KW - micromagnetic simulation

KW - recording physics

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Micromagnetic Study of Media Noise Plateau in Heat-Assisted Magnetic Recording

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