Magnetic Materials — Magnetic Recording Technology

1994 ◽  
pp. 279-293
Author(s):  
David Jiles
Keyword(s):  
Magnetic Materials ◽  
Magnetic Recording ◽  
Recording Technology

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

2002 ◽  
Vol 721 ◽  
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.

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

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.

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

1986 ◽  
Vol 39 (11) ◽  
pp. 1665-1677 ◽  
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.

Production Of CoPt Alloy Grains Within Protein Templates

2002 ◽  
Vol 735 ◽  
Author(s):  
Barnaby Warne ◽  
Eric L. Mayes
Keyword(s):  
Size Distribution ◽  
Magnetic Materials ◽  
Magnetic Recording ◽  
Manganese Oxides ◽  
Reaction Vessel ◽  
Maximum Diameter ◽  
Protein Coating ◽  
Patterned Films ◽  
Ultrahigh Density ◽  
Iron And Manganese

ABSTRACTThe spherical protein ferritin can be used as a generic reaction vessel for the production of a variety of materials, such as iron and manganese oxides. Here, its use for the aqueous production of nanoparticles of equiatomically alloyed CoPt is demonstrated. These have been considered for ultrahigh density magnetic recording as well as permanent magnetic materials. This monodisperse protein strictly regulates the maximum diameter of nanocrystals synthesized within its 8 nm diameter cavity. As a consequence of its external uniformity, it decouples the formation of highly regular self-patterned films from any size distribution associated with the synthesized material. Further, its 2 nm-thick protein coating discourages sintering of particles at temperatures required for the transformation to the L10 phase required for magnetic recording applications.

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