Outlook for maintaining areal density growth in magnetic recording

Abstract 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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Dependence of Predicted Areal Density on Common Optimization Strategies for Heat-Assisted Magnetic Recording

IEEE Magnetics Letters ◽

10.1109/lmag.2017.2719625 ◽

2017 ◽

Vol 8 ◽

pp. 1-4 ◽

Cited By ~ 3

Author(s):

Yipeng Jiao ◽

R. H. Victora

Keyword(s):

Magnetic Recording ◽

Areal Density ◽

Heat Assisted Magnetic Recording

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Areal Density Comparison Between Conventional, Shingled, and Interlaced Heat-Assisted Magnetic Recording With Multiple Sensor Magnetic Recording

IEEE Transactions on Magnetics ◽

10.1109/tmag.2018.2869046 ◽

2019 ◽

Vol 55 (3) ◽

pp. 1-3 ◽

Cited By ~ 2

Author(s):

Steven Granz ◽

Jason Jury ◽

Chris Rea ◽

Ganping Ju ◽

Jan-Ulrich Thiele ◽

...

Keyword(s):

Magnetic Recording ◽

Areal Density ◽

Heat Assisted Magnetic Recording ◽

Multiple Sensor

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Transient Thermal Response of the Media by Free Space Laser Heating in Heat Assisted Magnetic Recording

ASME 2016 Conference on Information Storage and Processing Systems ◽

10.1115/isps2016-9528 ◽

2016 ◽

Author(s):

Shaomin Xiong ◽

Robert Smith ◽

Na Wang ◽

Dongbo Li ◽

Erhard Schreck ◽

...

Keyword(s):

Magnetic Recording ◽

Heat Conduction Problem ◽

Temperature Response ◽

Thermal Response ◽

Areal Density ◽

Heat Assisted Magnetic Recording ◽

Lumped Model ◽

The Media ◽

Transient Thermal ◽

Transient Thermal Response

Heat assisted magnetic recording (HAMR) promises to deliver higher storage areal density than the current perpendicular magnetic recording (PMR) product. A laser is introduced to the HAMR system to heat the high coercively magnetic media above the Curie temperature (Tc) which is as high as 750 K in order to enable magnetic writing. The thermal response of the media becomes very critical for the success of the data writing process. In this paper, a new method is proposed to understand the transient thermal behavior of the HAMR media. The temperature response of the media is measured based on thermal erasure of the magnetically written signal. A lumped model is built to simplify the heat conduction problem to understand the transient thermal response. Finite element modeling (FEM) is implemented to simulate the transient thermal response of the media due to the laser pulse heating. The experimental and simulation results show fairly good agreement.

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