Lubricant depletion under various laser heating conditions in Heat Assisted Magnetic Recording (HAMR)

2014 ◽  
Author(s):  
Shaomin Xiong ◽  
Haoyu Wu ◽  
David Bogy
Keyword(s):  
Magnetic Recording ◽  
Laser Heating ◽  
Heat Assisted Magnetic Recording ◽  
Lubricant Depletion

Effect of Molecular Weight on Lubricant Depletion in a Heat Assisted Magnetic Recording System

2017 ◽  
Author(s):  
Deng Pan ◽  
Wenping Song
Keyword(s):  
Molecular Dynamics ◽  
Molecular Weight ◽  
Molecular Dynamics Simulation ◽  
Magnetic Recording ◽  
Recording System ◽  
Dynamics Simulation ◽  
Disk System ◽  
Heat Assisted Magnetic Recording ◽  
Lubricant Depletion

A model for studying lubricant depletion in HAMR slider/disk system was developed based on molecular dynamics simulation. We found that the lubricant molecular weight has small effect on lubricant depletion.

Performance benefits from pulsed laser heating in heat assisted magnetic recording

2014 ◽  
Vol 115 (17) ◽  
pp. 17B701 ◽  
Author(s):  
B. X. Xu ◽  
Z. H. Cen ◽  
J. H. Goh ◽  
J. M. Li ◽  
Y. T. Toh ◽  
...  
Keyword(s):  
Magnetic Recording ◽  
Laser Heating ◽  
Pulsed Laser ◽  
Heat Assisted Magnetic Recording ◽  
Pulsed Laser Heating

Study on Lubricant Depletion Induced by Laser Heating in Thermally Assisted Magnetic Recording Systems: Effect of Lubricant Thickness

2009 ◽  
Author(s):  
Norio Tagawa ◽  
Hideki Andoh ◽  
Hiroshi Tani
Keyword(s):  
Film Thickness ◽  
Magnetic Recording ◽  
Laser Heating ◽  
Disk Surface ◽  
Lubricant Film ◽  
Stress Effect ◽  
Lubricant Film Thickness ◽  
Lubricant Depletion ◽  
Thermocapillary Stress ◽  
Thermally Assisted Magnetic Recording

In this study, fundamental research on lubricant depletion due to laser heating in thermally assisted magnetic recording was conducted. In particular, the effect of lubricant film thickness on lubricant depletion was investigated. The conventional lubricant Zdol2000 was used. As a result, it was found that the lubricant depletion characteristics due to laser heating depend largely on the lubricant film thickness. In addition, it was suggested that the lubricant depletion mechanism involves the evaporation of the mobile lubricant molecules, when the maximum attained temperature is not very high. Another suggested lubricant depletion mechanism involves the thermocapillary stress effect induced by the disk surface temperature gradient resulting from the non-uniformity of the laser spot intensity distribution.

Experimental Study on Laser-Induced Protrusion in Heat-Assisted Magnetic Recording

2020 ◽  
Author(s):  
Qilong Cheng ◽  
Haoyu Wang ◽  
Siddhesh V. Sakhalkar ◽  
David B. Bogy
Keyword(s):  
Magnetic Recording ◽  
Laser Heating ◽  
Hot Spot ◽  
Magnetic Layer ◽  
Optical Power ◽  
Linear Velocity ◽  
Component Level ◽  
Heat Assisted Magnetic Recording ◽  
Power Change ◽  
The Media

Abstract In heat-assisted magnetic recording (HAMR), a laser is introduced to create a hot spot on the media and locally heat the magnetic layer to its Curie temperature. Besides the optical power that the laser provides to the media, thermal energy diffuses inside the slider and induces an extra protrusion, which is called laser-induced protrusion (LIP). The LIP needs to be considered and compensated during flying in the HAMR conditions. In this study, we focus on long timescale (milliseconds) of laser heating during the flying condition. When the laser is switched from OFF to ON, the touchdown power, indicated by an acoustic emission (AE) sensor, decreases due to spacing loss and the touchdown power change (ΔTDP) is used as the measure of the LIP. A component-level spinstand stage for HAMR heads and media is used to study the LIP as a function of laser-on time, laser current and linear velocity. Our experimental results show that it takes around 20 ms for the LIP to reach steady state and the protrusion size is proportional to the square of laser current. As the operating linear velocity increases from 12 m/s to 24 m/s, the LIP decreases by approximately 52%.

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