Magnetic Recording Technology (Ultimate Solutions for Future Density Growth)

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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Regular Array of Magnetic Nano-Dots Prepared by Nanochannel Glass Replica Masks

MRS Proceedings ◽

10.1557/proc-721-e5.6 ◽

2002 ◽

Vol 721 ◽

Cited By ~ 1

Author(s):

Bo Cheng ◽

Kun Yang ◽

B. L. Justus ◽

W. J. Yeh

Keyword(s):

Data Storage ◽

Magnetic Recording ◽

Thin Film Deposition ◽

Film Deposition ◽

Perpendicular Recording ◽

Recording Technology ◽

Sputtering Deposition ◽

Longitudinal Recording ◽

Dot Density ◽

Magnetic Dots

AbstractIn magnetic recording technology, barriers based on fundamental physical limits on the data density are being approached for the current longitudinal recording modes. However, demands for higher data storage density have escalated in recent years. Discrete perpendicular recording is a viable method to achieve 100 Gb per square inch and beyond. We report on the development of a novel technique to fabricate uniform arrays of nano-sized magnetic dots. Uniform arrays of nanometer-sized magnetic dots are obtained by magnetron sputtering deposition through a nanochannel glass replica mask. The platinum replica masks are fabricated using thin film deposition on etched nanochannel glass and contain uniform hexagonally patterned voids with diameters as small as 50 nanometers. The magnetic dot density can be as high as 1011 per square inch. Our method provides a simple yet effective way to create regularly arranged discrete magnetic media that can be used for perpendicular magnetic recording. The magnetic properties of the dots are studied with a vibrating sample magnetometer.

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Effects of Thermal and Cross-Track Variations for Longitudinal Heat-Assisted Magnetic Recording Systems

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.770.331 ◽

2013 ◽

Vol 770 ◽

pp. 331-334

Author(s):

Piya Kovintavewat ◽

Adisorn Kaewpukdee ◽

Nitthita Chirdchoo

Keyword(s):

Magnetic Recording ◽

Storage Capacity ◽

Current Data ◽

Data Recording ◽

Magnetic Medium ◽

Recording Technology ◽

Heat Assisted Magnetic Recording ◽

Capacity Limit ◽

Superparamagnetic Limit ◽

Cross Track

The current data recording technology is approaching its capacity limit approximately 1 Tbit/in2(terabits per square inch) known as superparamagnetic limit. Heat-assisted magnetic recording (HAMR) is one of the promising technologies that is being planned to be used as a new data recording technology to achieve the storage capacity beyond 1 Tbit/in2. In HAMR, the laser is applied to heat a magnetic medium during the writing process, which results in the unique transition characteristics if compared to a conventional system. This paper investigates the effects of thermal and cross-track variations to the transition characteristics (both transition center and transition parameter) of longitudinal HAMR systems. Experimental results indicate that the longitudinal HAMR system can withstand some amount of thermal and cross-track variations and still provides satisfactory system performance.

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Magnetic Materials — Magnetic Recording Technology

Introduction to the Electronic Properties of Materials ◽

10.1007/978-1-4615-2582-0_14 ◽

1994 ◽

pp. 279-293

Author(s):

David Jiles

Keyword(s):

Magnetic Materials ◽

Magnetic Recording ◽

Recording Technology

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Mechanics-Related Problems of Magnetic Recording Technology and Ink-Jet Printing

Applied Mechanics Reviews ◽

10.1115/1.3149508 ◽

1986 ◽

Vol 39 (11) ◽

pp. 1665-1677 ◽

Cited By ~ 2

Author(s):

D. B. Bogy ◽

F. E. Talke

Keyword(s):

Magnetic Recording ◽

Flexible Substrate ◽

Disk File ◽

Rotating Disks ◽

Recording Technology ◽

Disk Interface ◽

On Demand ◽

Drop On Demand ◽

Fluid Jets ◽

Jet Printing

In this paper, mechanical aspects of magnetic recording technology and nonimpact printing are discussed. In the recording area, theoretical and experimental aspects of air bearing theory, head/disk dynamics, and head/disk tribology are studied. Flutter of rotating disks is investigated, the flow field between rotating disks is described, and nonrepeatable run-out of disk file spindles is studied. Furthermore, the head/disk interface for flexible media is discussed and dimensional stability of flexible substrate is examined. In the printing area, experimental and theoretical investigations using continuous and drop-on-demand fluid jets are presented, and numerical calculations of the drop formation process in drop-on-demand fluid jets are described.

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