Magnetic and recording characteristics of bicrystalline longitudinal recording medium formed on an MgO single crystal disk substrate

Author

Futamoto, Masaaki ; Suzuki, Mikio ; Inaba, Nobuyuki ; Nakamura, Atsushi ; Honda, Yukio

Author_Institution

Central Res. Lab., Hitachi Ltd., Tokyo, Japan

Volume

30

Issue

6

fYear

1994

fDate

11/1/1994 12:00:00 AM

Firstpage

3975

Lastpage

3977

Abstract

An epitaxial thin film growth has been applied to prepare bicrystalline CoCrPt longitudinal recording medium using an MgO(100) single crystal disk substrate. X-ray and TEM measurements have revealed that the magnetic layer has a bicrystalline structure which consists of two variant domains with their c-axes lying in-plane and perpendicular-to each other. The maximum medium coercivity is observed at (2n+1)π/4, while the minimum coercivity is observed at nπ/2 from the MgO[010] when measured along the circumferential direction. The highest signal to noise ratio, the highest linear resolution, and the best off-track performance are observed at (2n+1)π/4 where the direction of the recording magnetic head field lies between the easy magnetization axes of the two variant domains

Keywords

X-ray diffraction; chromium alloys; cobalt alloys; coercive force; ferromagnetic materials; magnesium compounds; magnetic disc storage; magnetic domains; magnetic thin film devices; magnetic thin films; platinum alloys; sputter deposition; transmission electron microscopy; vapour phase epitaxial growth; CoCrPt-MgO; MgO; MgO single crystal disk substrate; TEM measurements; X-ray measurements; bicrystalline longitudinal recording medium; c-axes; circumferential direction; easy magnetization axes; epitaxial thin film growth; linear resolution; magnetron sputtering; medium coercivity; off-track performance; recording characteristics; recording magnetic head field; signal to noise ratio; variant domains; Coercive force; Disk recording; Magnetic domains; Magnetic field measurement; Magnetic recording; Perpendicular magnetic recording; Signal resolution; Signal to noise ratio; Substrates; Transistors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.333962

Filename

333962