Perpendicular magnetic recording focused on the origin and its significance

Author

Iwasaki, Shun-ichi

Author_Institution

Tohoku Inst. of Technol., Sendai, Japan

Volume

38

Issue

4

fYear

2002

fDate

7/1/2002 12:00:00 AM

Firstpage

1609

Lastpage

1614

Abstract

The speculations and discoveries that guided the beginning of perpendicular magnetic recording are described in this paper. Four important discoveries of the existence of perpendicular magnetization, the Co-Cr film, the effect of double-layered medium, and the complementary relationship are described in detail. The studies on thin-film media and recording mechanisms at short wavelengths in the 1960s led to the realization of the new perpendicular magnetic recording through these discoveries. None of this work was on any list of research goals in the 1960s. The historical view of the development of magnetic recording is also discussed. It was deduced that an invention needs more than 20 years before its worldwide application and that major technological innovations take place with a period of about 40 years

Keywords

ferromagnetic materials; history; magnetic thin film devices; perpendicular magnetic recording; Co-Cr; Co-Cr film; complementary relationship; double-layered medium; historical view; perpendicular magnetic recording; recording mechanisms; short wavelengths; thin-film media; Demagnetization; Disk recording; Large-scale systems; Magnetic analysis; Magnetic films; Magnetic heads; Magnetic recording; Perpendicular magnetic recording; Saturation magnetization; Technological innovation;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.1017743

Filename

1017743