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Computer memory systems
Published in Joseph D. Dumas, Computer Architecture, 2016
Magnetic storage in most modern computer systems is in the form of disk and tape drives. Access times for magnetic disks are on the order of milliseconds or longer, so this technology is useful only for secondary storage, not main memory. Tape drives are even slower due to the frequent necessity of traversing a long physical distance down the tape in order to find the needed information. The chief advantages of magnetic memories, besides their nonvolatility, are very low cost per gigabyte of storage and extremely high information density (a hard drive can store a terabyte or more of data in a few cubic inches of space). Removable disks and tape cartridges (and some hard drives) also offer the advantage of portability.
Field Applications
Published in Ahmad Shahid Khan, Saurabh Kumar Mukerji, Electromagnetic Fields, 2020
Ahmad Shahid Khan, Saurabh Kumar Mukerji
Magnetic storage and magnetic recording refer to the storage of data on a magnetized medium. Magnetic storage uses different patterns of magnetization in a magnetizable material to store data and is a form of non-volatile memory. This stored information can be accessed by using read/write head(s). Magnetic storage media, primarily hard disks are widely used to store computer data and audio and video signals. Other examples of magnetic storage media include floppy disks, magnetic recording tape, and magnetic stripes on credit cards.
Trends in Polymer Applications
Published in Manas Chanda, Plastics Technology Handbook, 2017
Although magnetic storage discs are beginning to be regarded as archival as compared to be regarded as archival as compared to optical discs, the advantage they have over most optical systems is that information can be added and erased. The two types of magnetic discs on the market are Winchester hard discs and stretched discs.
50 years (and more) of German computer history
Published in International Journal of Parallel, Emergent and Distributed Systems, 2020
In Germany, the manufacturers of such machines were former multi-industry companies with increased regularity that produced weapons, automobiles, motorcycles, bicycles or sewing machines before the war but also other companies from fine mechanical fields. I am going to elaborate on some of these companies and their histories in the second part of this article. Unlike other countries, German mainframe manufacturers missed their entry into the emerging computer mass market. At the end of the 1950s, a new storage medium was developed for these machines that could later also be used for reading programmes: the magnetic ledger-card. The magnetic storage of data was already established by magnetic drum memory. This technology was now combined with account cards made of paper which had been used since the thirties. These cards were a form of row-wise accounting in which the text and posting balance were as one underneath the other in a delayed manner. This combination allowed the last entry to be stored magnetically and offered the possibility to read them again during the next use.
Electronic structures of MgO/Fe interfaces with perpendicular magnetization revealed by hard X-ray photoemission with an applied magnetic field
Published in Science and Technology of Advanced Materials, 2019
Shigenori Ueda, Masaki Mizuguchi, Masahito Tsujikawa, Masafumi Shirai
Ferromagnetic metal (FM) thin films having a magnetization easy axis perpendicular to the film surfaces due to a strong magneto-crystalline anisotropy (MCA) have attracted much attention in spintronic applications, since thermally stable perpendicular magnetization sufficiently above room temperature (RT) is required to realize non-volatile ultrahigh-density magnetic storage devices. It is well known that L10-ordered FePt(001) and CoPt(001) thin films exhibit the perpendicular magnetic anisotropy (PMA) along the c-axis due to the large uniaxial magnetic anisotropy (Ku) of these materials [1–3]. Although the growth of the L10-FePt and CoPt thin films has been established by several groups [1–3], the films contain precious Pt metal that is a disadvantage in cost for applications. For the development of spintronic device applications in practical ways, it is necessary that the devices are made from earth-abundant and environmentally friendly materials.