Integration of Heat Assisted Magnetic Recording technology into enterprise hard disk drives

2013 ◽  
Author(s):  
Jon Trantham ◽  
Tim Rausch ◽  
Ying Qi ◽  
Alfredo Sam Chu ◽  
Jason Riddering ◽  
...  
Keyword(s):  
Magnetic Recording ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives ◽  
Recording Technology ◽  
Heat Assisted Magnetic Recording

Thermal Lagging of Multilayered Structure in Heat-Assisted Magnetic Recording Systems

2020 ◽  
Vol 12 (3) ◽  
Author(s):  
Jian Su ◽  
Tingting Tang ◽  
Ruixin Lu ◽  
Peng Yu
Keyword(s):  
Temperature Gradient ◽  
Thermal Resistance ◽  
Magnetic Recording ◽  
Heat Sink ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Interfacial Thermal Resistance ◽  
Disk Drives ◽  
Horizontal Temperature Gradient ◽  
Heat Assisted Magnetic Recording

Abstract In the present study, we numerically investigate the thermal lagging behavior on the hard disk drives in heat-assisted magnetic recording systems via the optical absorption model. The influences of overcoats, laser radius, relative scanning speed, interfacial thermal resistance, and the heat sink layer on the thermal lagging behavior are studied in detail. It is found that the thermal lagging distance, i.e., the horizontal distance between the location of the maximum temperature and the laser center, increases with an increment of speed and/or radius of the laser spot. The overcoats, the interfacial thermal resistance, and the heat sink layer have negligible effects on the lagging distance. Thus, the multilayered disk can be simplified as a single-layer disk for investigating thermal lagging distance. Meanwhile, the horizontal temperature gradient varies with these factors. Different overcoats result in different horizontal temperature gradient owing to the difference of in-plane thermal diffusivity. A laser with a smaller radius or a slower speed leads to a higher horizontal temperature gradient. The thermal resistance influences the horizontal temperature gradient insignificantly. This study may provide useful information for the design of hard disk drives for heat-assisted magnetic recording technologies.

scholarly journals Impact of radius and skew angle on areal density in heat assisted magnetic recording hard disk drives

AIP Advances ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 056507
Author(s):  
Michael Cordle ◽  
Chris Rea ◽  
Jason Jury ◽  
Tim Rausch ◽  
Cal Hardie ◽  
...  
Keyword(s):  
Magnetic Recording ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Areal Density ◽  
Disk Drives ◽  
Skew Angle ◽  
Heat Assisted Magnetic Recording

Capacity Advantage of Array-Reader-Based Magnetic Recording (ARMR) for Next Generation Hard Disk Drives

2014 ◽  
Vol 50 (3) ◽  
pp. 155-161 ◽  
Author(s):  
George Mathew ◽  
Euiseok Hwang ◽  
Jongseung Park ◽  
Glen Garfunkel ◽  
David Hu
Keyword(s):  
Magnetic Recording ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives ◽  
Next Generation

Air Bearing Pushback in Heat Assisted Magnetic Recording

2019 ◽  
Author(s):  
Shaomin Xiong ◽  
Robert Smith ◽  
Chanh Nguyen ◽  
Youfeng Zhang ◽  
Yeoungchin Yoon
Keyword(s):  
Magnetic Recording ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drive ◽  
Flying Height ◽  
Air Bearing ◽  
Magnetic Media ◽  
Heat Assisted Magnetic Recording ◽  
Height Control ◽  
Different Dimensions

Abstract The air bearing surface is critical to the spacing control in current hard disk drives (HDDs). Thermal protrusions, including thermal flying height control (TFC) and writer coil protrusion, drive the reader/writer elements closer to the magnetic media. The spacing control actuation efficiency depends on the air bearing push back response after the TFC or writer protrudes. In the next generation hard disk drive technology, heat assisted magnetic recording (HAMR), laser induced protrusions further complicate the spacing control. The laser induced protrusions, such as the localized NFT protrusion and a wider change of the crown and camber, have very different dimensions and transient characteristics than the traditional TFC and writer protrusion. The dimension of the NFT protrusion is relatively smaller, and the transient is much faster than the TFC protrusion. However, it is found that the NFT protrusion is large enough to generate an air bearing push back effect, which changes the read and write spacing when the laser is powered on. To accurately control spacing in HAMR, this push back effect has to be taken into account.

Extendibility of traditional perpendicular magnetic recording for hard disk drives

2011 ◽  
Vol 109 (7) ◽  
pp. 07B774
Author(s):  
James A. Bain ◽  
B. V. K. Vijaya Kumar ◽  
Yu Cai ◽  
Seungjune Jeon ◽  
Ken Mai ◽  
...  
Keyword(s):  
Magnetic Recording ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives ◽  
Perpendicular Magnetic Recording

scholarly journals Ultrahigh-Density Recording Technologies

MRS Bulletin ◽  
1996 ◽  
Vol 21 (9) ◽  
pp. 17-22 ◽  
Author(s):  
Mark H. Kryder
Keyword(s):  
Data Storage ◽  
Magnetic Recording ◽  
Computer Systems ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Time Frame ◽  
Optical Recording ◽  
Disk Drives ◽  
Slowing Down ◽  
Long Term Storage

Magnetic recording and optical recording are the major technologies used to provide long-term storage of information in today's computer systems. Magnetic recording has been used for data storage in computer systems for over 40 years, and the advances in technology that have occurred in that time frame are nothing short of phenomenal. One might expect that after 40 years of dominance, the rate of progress in magnetic recording would be slowing down and that other technologies would be moving in to replace it. However rather than slowing down its rate of progress, magnetic recording is now advancing at a faster rate than at any time in the past. Magnetic hard-disk drives represent the largest segment of the data-storage business, and the number of hard-disk drives sold is increasing at about 20% per year. Tape drives continue to enjoy a very substantial market and are also advancing at a rapid pace while flexible disk drives continue to appear in every personal computer sold and have recently increased capacity by nearly two orders of magnitude.Optical recording was introduced into the marketplace in 1989 and has secured a significant market. However thus far, optical recording has primarily found new market niches, rather than being directly competitive with magnetic recording. CD-ROMs are widely used for the distribution of prerecorded information—a business that is now comparable in size to the magnetic-tape-drive business. On the other hand, erasable, optical drives, which were first introduced in 1989, have not had nearly as much success and have much smaller markets than either magnetic hard drives or tape drives.

Plasmonic near-field transducer for heat-assisted magnetic recording

Nanophotonics ◽  
2014 ◽  
Vol 3 (3) ◽  
pp. 141-155 ◽  
Author(s):  
Nan Zhou ◽  
Xianfan Xu ◽  
Aaron T. Hammack ◽  
Barry C. Stipe ◽  
Kaizhong Gao ◽  
...  
Keyword(s):  
Magnetic Recording ◽  
Near Infrared ◽  
Near Field ◽  
Hard Disk Drives ◽  
Plasmonic Nanostructures ◽  
Disk Drives ◽  
Limited Region ◽  
Heat Assisted Magnetic Recording ◽  
Self Heating ◽  
Infrared Frequencies

AbstractPlasmonic devices, made of apertures or antennas, have played significant roles in advancing the fields of optics and opto-electronics by offering subwavelength manipulation of light in the visible and near infrared frequencies. The development of heat-assisted magnetic recording (HAMR) opens up a new application of plasmonic nanostructures, where they act as near field transducers (NFTs) to locally and temporally heat a sub-diffraction-limited region in the recording medium above its Curie temperature to reduce the magnetic coercivity. This allows use of very small grain volume in the medium while still maintaining data thermal stability, and increasing storage density in the next generation hard disk drives (HDDs). In this paper, we review different plasmonic NFT designs that are promising to be applied in HAMR. We focus on the mechanisms contributing to the coupling and confinement of optical energy. We also illustrate the self-heating issue in NFT materials associated with the generation of a confined optical spot, which could result in degradation of performance and failure of components. The possibility of using alternative plasmonic materials will be discussed.

The Future of Magnetic Recording

2001 ◽  
Author(s):  
Roger Wood
Keyword(s):  
Magnetic Recording ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drive ◽  
Information Storage ◽  
Limiting Factors ◽  
Recording Technology ◽  
Fundamental Limits ◽  
Data Rates ◽  
External Characteristics

Abstract Magnetic information storage technology has made astounding progress since its invention over a hundred years ago. For the last several years, storage packing densities in hard disk drives have doubled every year! This frantic pace is expected to soon slow because of the some very fundamental limits that are becoming increasingly evident in the technology. Conventional magnetic recording technology is expected to ultimately reach densities of several hundred Gigabits per square inch and data-rates of a few Gigabits/s (current products are ∼25 Gbit/sq.in. and over 0.5 Gbit/s). We examine the key limiting factors and then try to develop a consistent geometry and set of material properties that could support a density close to one Terabit per square inch. Finally we speculate about the external characteristics of a small hard disk drive that would store one Terabyte of information [1].

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