Ferrite Film Recording Surfaces for Disk Recording

Advancements in Research of Magnetic Recording

“…In 1974, Gomstock etal [37] and Inagaki etal [38] in 1976 succeeded in .obtaining thin films of gamma ferric oxide by sputtering on NiP/AI disks. These were the first attempts to form a continuous thin film magnetic oxide material which had high coercivity, high remanent magnetization, and was very corrosion and wear resistant.…”

Magnetic Storage Media

“…The section concludes with a short disprojected for a 10 Gbit/in. 2 medium are (10) to be H c ϭ 3000 cussion of thermal stability, which is also correlated with the Oe, d ϭ 20 nm, ͳ ϭ 10 nm, and g ϭ 200 nm, from which one micromagnetic properties. The magnetic domain and medium may find H g ϭ 9200 Oe.…”

“…However, the medium was never commercialized for two practical reasons: the recording head could not reliably read all the previously recorded information, since the wires were easily twisted, and the read-write process was interrupted whenever the thin wires broke and needed to be ''repaired'' by knotting the broken ends together. To improve upon this type of magnetic recording medium and to avoid its mechanical problems, a spliceable tape coated with synthetic particles, including Ͳ-Fe 2 O 3 , was developed in the early 1940s (2). The particles were aciculate (needle-shaped) and were held with their long axes parallel to a polymer tape backing.…”

“…It is predicted that an areal density of 20 Gbit/in. 2 will be demonstrated, and that media above 10 Gbit/in. 2 should be available commercially by the turn of the century.…”

“…2 will be demonstrated, and that media above 10 Gbit/in. 2 should be available commercially by the turn of the century. (With respect to disk diameter and area, the units used in the United States are still the inch and square inch, respectively.…”