Magnetic recording materials and Prospect _394

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Status and Prospect of magnetic recording materials

New pieces of solid-state memory to replace the video floppy disk. However, the development of magnetic recording technology and materials are also Ai party will not, itself a vast reservoir of development potential. Represented by a digital recording of high density and high density recording, the ultrafine particles of metal powder, barium ferrite magnetic powder and metal coating as the representative of the new development and application of magnetic recording material is increased in the development stage. 90 further to a higher magnetic recording material density, high performance and miniaturization development, there will be new breakthroughs. * The beginning of 90's, the Netherlands, Philips and Sony in El audio recording of the lead ~ -] T-developing a new contest. Philips and Panasonic jointly developed a called DOG (DigitalCompactCassetle) of the new digital cassette system. DAT DCC system on the original main improvement is the use of helical scan heads are not, and the introduction of new thin-film magnetic head structure. This cassette can maintain its normal operating conditions and operating digital recording, and achieve the same quality and laser discs. The new recording system that is the biggest advantage of DCC is currently a regular cassette tape compatibility, both used the traditional programs have been recorded cassette tape for playback, but also with the DCC digital tape recording and still sound. It has a large number of programs have been recorded cassette of ordinary consumers, has great appeal. DCC King word recording system has been the United States, Britain, Japan and other countries support the music program publisher, plans to officially listed after the fall of 1992. At the same time, Sony is making great efforts to develop called MD (MiniDisc) micro-optical digital audio recording system. Company, with a diameter of 64 mm of the MD, the area is only CD's] / 4, while the volume and sound quality is identical with the CD. CD playback only, can not be re-recorded, MD can be repeatedly re-recorded playback, but also have a convenient CD selections advantages over tape. Therefore, Sony said it will be the next best alternative form of tape recordings. But in the MD system, scheduled to be officially listed in 1993 until early 1992 Sony started selling the 19 brand name called Scooprnan a miniature digital recording system. The tape size is 112.9 × 52.2 × 23.1 mm and weighs 142 grams with battery, tape cartridge size 3 () × 21X5 mm, equivalent to a small stamp in the area. Box is built with a width of only 2.5 mm of metal with double vacuum evaporation, the coercivity of 80 kA / m, remanence special 390 mm, surface recording density of 31 Mbit / square centimeter, with only 4.8 microns thick, is used in polyester film is more suitable than the high-temperature vacuum deposition process conditions with a base polyimide and its mechanical strength is equivalent to 10.5-micron thick polyester tape base. Just listed a box recorders 24, a, J of this micro-cassette, the price is 1o dollars. Data recording material is also recorded to a higher density development. In early 1992, the United States, IBM 3480-type cassette in the original basis of the 3490E has developed a new type of cassette,[link widoczny dla zalogowanych], its non-compressed recording capacity of 800 megabytes, using IBM compression system, the recording capacity of up to 2.4 Gigabit bytes. Although the capacity of the current record of 4 megabytes of 89 mm micro-floppy disk has not been universal application. El Matsushita Electric has already announced this in] 992 within a year capacity of 28 megabytes of disk drives and their micro-recording material. The Toshiba will be launched in 1994, a capacity of 40 megabytes of disk drives and micro-recording material. In addition, IBM and 3M, the U.S. will further increase. lc with the recording capacity of data: 1993 - 10 gigabytes, 1995 - 35 gigabytes. 9o's high-definition television (HDTV) in practical terms there will be a major breakthrough, such as HD satellite, HD recorded programs, exchange, HD video production, HD cinema, etc., to further improve the video quality of a higher requirements. Perpendicular magnetic recording is the direction of magnetic recording technology. Scholars from various countries in recent years, the existing gap for perpendicular magnetic recording large losses and other problems for a lot of research and improvement. Perpendicular recording once the breakthrough in technology, you can use than the current longitudinal recording easier to achieve ultra-high density recording. El scholars of the Northeastern University, the future of the video tape, the use of a ring head and the vertical component of the metal tape recording, it is possible to achieve high recording capacity of 10 bits, so it has good development prospects (Editor Song Yi Meng) Science & Technology Review 2 / 199,335

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