Thermal Stability of Lubricants for Application in Heat-Assisted Magnetic Recording

2013 ◽  
Author(s):  
Bala Krishna Pathem ◽  
Xing-Cai Guo ◽  
Yoko Saito ◽  
Robert Waltman ◽  
John Burns ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Magnetic Recording ◽  
Experimental Studies ◽  
Thermal Exposure ◽  
Areal Density ◽  
Head Disk Interface ◽  
Heat Assisted Magnetic Recording ◽  
Disk Interface ◽  
Film Evaporation ◽  
Thermal Stability Of

In order to meet the demand to increase the areal density of magnetic recording, promising technologies such as heat-assisted magnetic recording (HAMR) are being extensively pursued [1–3]. However, the high transient disk temperature (400–500 °C, nanosecond time scale) required by this recording scheme might dramatically affect the reliability of the head-disk interface. Possible issues include overcoat oxidation and graphitization, both on head and disk, as well as lubricant evaporation, thermodiffusion, and decomposition. Although modeling and experimental studies have been published describing the lubricant film evaporation under thermal exposure, very few studies have been directed toward understanding the mechanisms of lubricant decomposition [4–7].

Head–Disk Interface Materials Issues in Heat-Assisted Magnetic Recording

2014 ◽  
Vol 50 (3) ◽  
pp. 137-143 ◽  
Author(s):  
Bruno Marchon ◽  
Xing-Cai Guo ◽  
Bala Krishna Pathem ◽  
Franck Rose ◽  
Qing Dai ◽  
...  
Keyword(s):  
Magnetic Recording ◽  
Head Disk Interface ◽  
Heat Assisted Magnetic Recording ◽  
Disk Interface ◽  
Interface Materials

A Numerical Study of the Nanoscale Heat Transfer in the Head-Disk Interface for Heat Assisted Magnetic Recording

2016 ◽  
Author(s):  
Haoyu Wu ◽  
David Bogy
Keyword(s):  
Heat Transfer ◽  
Magnetic Recording ◽  
Transfer Problem ◽  
Numerical Study ◽  
Near Field ◽  
Experimental Result ◽  
Head Disk Interface ◽  
Heat Assisted Magnetic Recording ◽  
Disk Interface ◽  
Nanoscale Heat Transfer

The near field transducer (NFT) overheating problem is an issue the hard disk drive (HDD) industry has faced since heat-assisted magnetic recording (HAMR) technology was first introduced. In this paper, a numerical study of the head disk interface (HDI) is performed to predict the significance of the nanoscale heat transfer due to the back heating from the disk. A steady-state heat transfer problem is first solved to get the disk temperature profile. Then an iterative simulation of the entire HDI system is performed. It shows that the heat transfer coefficient in the HDI increases to about 6:49 × 106 W/(m2K) when the clearance is 0:83 nm. It also shows that in the free space laser scenario, the simulation result is close to the experimental result.

A Heat Transfer Study in the Head Disk Interface and an Insight to Heat Assisted Magnetic Recording Design

2017 ◽  
Author(s):  
Haoyu Wu ◽  
David Bogy
Keyword(s):  
Heat Transfer ◽  
Magnetic Recording ◽  
Convective Heat Transfer Coefficient ◽  
Head Disk Interface ◽  
Heat Assisted Magnetic Recording ◽  
Disk Interface ◽  
Height Control ◽  
Contact Sensor ◽  
Series Of Experiments ◽  
Fly Height

Understanding the heat transfer in the head disk interface (HDI) in the heat assisted magnetic recording (HAMR) is important. In this paper, we report on a series of experiments to study the heat transfer in the HDI using the perpendicular magnetic recording (PMR) heads and media. The temperature increase of the embedded contact sensor (ECS) and the thermal fly-height control (TFC) heater was compared in the fly setup and non-fly setup. A series of simulations were performed to explain the results. We show that the design of the air bearing surface can significantly affect the pressure distribution in the read/write transducer area, and thereby affect the convective heat transfer coefficient.

Thermal Stability of Modified Perfluoropolyether Lubricants for Application in Heat Assisted Magnetic Recording

2011 ◽  
Author(s):  
Jumin Rhew ◽  
Hogap Kim ◽  
Hao Zheng ◽  
Ho-Jong Kang ◽  
Frank E. Talke
Keyword(s):  
Thermal Stability ◽  
Free Radical ◽  
Magnetic Recording ◽  
Nmr Spectra ◽  
Hydroxyl Groups ◽  
Heat Assisted Magnetic Recording ◽  
Chemically Modified ◽  
Thermal Stability Of ◽  
End Group ◽  
Pfpe Lubricants

Perfluoropolyether (PFPE) lubricants were chemically modified to maximize their thermal stability for application in heat assisted magnetic recording (HAMR). Benzophenone (BP) was introduced to react with the hydroxyl end group in PFPE to act as a free radical stabilizer. Modification of the PFPE by benzophenone was confirmed by evaluation of the chemical shift and the area change of the hydroxyl peak in the 1H NMR spectra. The thermal stability of modified PFPE lubricants was studied using thermo-gravimetry. The improvement in the thermal stability was found to be a function of the amount of substituted hydroxyl groups in PFPE.

Material Transfer Inside Head Disk Interface for Heat Assisted Magnetic Recording

2017 ◽  
Vol 65 (2) ◽  
Author(s):  
Shaomin Xiong ◽  
Na Wang ◽  
Robert Smith ◽  
Dongbo Li ◽  
Erhard Schreck ◽  
...  
Keyword(s):  
Magnetic Recording ◽  
Head Disk Interface ◽  
Material Transfer ◽  
Heat Assisted Magnetic Recording ◽  
Disk Interface

Nanoscale heat transfer in the head-disk interface for heat assisted magnetic recording

2016 ◽  
Vol 108 (9) ◽  
pp. 093106 ◽  
Author(s):  
Haoyu Wu ◽  
Shaomin Xiong ◽  
Sripathi Canchi ◽  
Erhard Schreck ◽  
David Bogy
Keyword(s):  
Heat Transfer ◽  
Magnetic Recording ◽  
Head Disk Interface ◽  
Heat Assisted Magnetic Recording ◽  
Disk Interface ◽  
Nanoscale Heat Transfer
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