Simulation of Chemical Order–Disorder Transitions Induced Thermally at the Nanoscale for Magnetic Recording and Data Storage

2020 ◽  
Vol 3 (8) ◽  
pp. 7668-7677
Author(s):  
Nikolay I. Polushkin ◽  
Thomas B. Möller ◽  
Sergey A. Bunyaev ◽  
Artem V. Bondarenko ◽  
Miao He ◽  
...  
Keyword(s):  
Data Storage ◽  
Magnetic Recording ◽  
Chemical Order

scholarly journals Correction to Simulation of Chemical Order-Disorder Transitions Induced Thermally at the Nanoscale for Magnetic Recording and Data Storage

2020 ◽  
Vol 3 (12) ◽  
pp. 12433-12433
Author(s):  
Nikolay I. Polushkin ◽  
Thomas B. Möller ◽  
Sergey A. Bunyaev ◽  
Artem V. Bondarenko ◽  
Miao He ◽  
...  
Keyword(s):  
Data Storage ◽  
Magnetic Recording ◽  
Chemical Order

Design and Fabrication of High Anisotropy Nanoscale Bit-Patterned Magnetic Recording Medium for Data Storage Applications

2019 ◽  
Vol 3 (25) ◽  
pp. 249-258 ◽  
Author(s):  
Dmitri Litvinov ◽  
Chunsheng E ◽  
Vishal Parekh ◽  
Darren Smith ◽  
James Rantschler ◽  
...  
Keyword(s):  
Data Storage ◽  
Magnetic Recording ◽  
Recording Medium ◽  
Magnetic Recording Medium ◽  
High Anisotropy

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.

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.

Magnetic Recording Materials: Present and Future

MRS Bulletin ◽  
1990 ◽  
Vol 15 (3) ◽  
pp. 23-25 ◽  
Author(s):  
Ami Berkowitz
Keyword(s):  
Data Storage ◽  
Magnetic Recording ◽  
Storage Capacity ◽  
Materials Science ◽  
State Of The Art ◽  
Special Issue ◽  
Dominant Position ◽  
Storage Density ◽  
Data Rates ◽  
Contact Recording

For more than 40 years, magnetic recording has been the dominant technology for electronic data storage. During this time, the areal storage density on disks has risen to >108 bits/cm2. On tapes the corresponding figure is 0.2 × 108 bits/cm2. Thus each bit uses about a 1.0 μm2 area. These bits are written and read at data rates that require head-disk relative speeds of tens of meters per second and head-tape relative speeds of several meters per second. All this is accomplished at head-disk spacings of ≈0.2 μm and with contact recording for tapes.It is truly a wonder that the systems work as well as they do. In fact, for many features in magnetic recording systems it isn't certain why they work as well as they do. However, the demand for storage capacity is estimated to be increasing at about 40% per year. So it is natural to ask whether magnetic recording can maintain its present dominant position in the foreseeable future. The answer is — “Very likely, yes” — but this prediction is based on the assumption that a number of formidable fascinating problems will be solved in order to increase the areal bit density.The five articles in this special issue present the state-of-the-art in those key areas of magnetic recording that involve materials science, and they define the problems involved in increasing storage density. James U. Lemke discusses the background and outlook for magnetic recording.

scholarly journals A study of perpendicular magnetic recording media using polarized SANS

2014 ◽  
Vol 70 (a1) ◽  
pp. C148-C148
Author(s):  
Stephen Lister ◽  
Vikash Venkataramana ◽  
Thomas Thomson ◽  
Joachim Kohlbrecher ◽  
Ken Takano ◽  
...  
Keyword(s):  
Thin Film ◽  
Data Storage ◽  
Magnetic Recording ◽  
Magnetic Moments ◽  
Magnetic Films ◽  
Oxide Shell ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Recording Layer ◽  
Perpendicular Magnetic Recording

The study of thin film magnetic systems that are structured on the nanoscale is an area of intense interest. Small-angle neutron scattering is an extremely powerful probe of nanomagnetism in the bulk, but in thin-film systems the experiments are challenging due both to the small scattering volume available and also to scattering from other sources such as the substrate and sample environment. We have demonstrated that such experiments are however possible in magnetic films as thin as 10 nm. A good example to illustrate this is the case of perpendicular magnetic recording media. These materials are found in all modern magnetic hard drives, the data storage technology that continues to be of tremendous commercial and technological importance. These media are advanced functional multilayered materials, containing an active recording layer of only around 10 nm in thickness. This recording layer is compositionally segregated into 8 nm-sized grains of a magnetic CoCrPt alloy separated by a thin oxide shell, typically SiO2. These media have their magnetic moments oriented perpendicular to the plane of the film. Determining the local magnetic structure and reversal behavior is key to understanding the performance of perpendicular media in recording devices. Polarised SANS has proved to be a very effective tool to measure these materials at a sub-10nm length scales. The signal of interest must however also be distinguished from the scattering from other layers in the structure, some of which are also magnetic. We will present a summary of some recent results on recording media, including measurements of the grain-sized dependent switching with and without the presence of an exchange spring. We will also briefly mention experiments that demonstrate the viability of extending this approach to measurement for lithographically defined structures similar to those for application in bit-patterned media, including 2d artificial spin-ice and structurally glassy arrays.

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