Estimation of the resolution by MAMMOS read-out

Author

Takagi, N. ; Yamaguchi, A. ; Uchibara, Y. ; Sumi, S. ; Awano, H. ; Shirai, H. ; Watanabe, Hiromi ; Ohta, N.

Author_Institution

Hypermedia Res. Center, Sanyo Electr. Co. Ltd., Gifu, Japan

Volume

34

Issue

4

fYear

1998

fDate

7/1/1998 12:00:00 AM

Firstpage

2000

Lastpage

2002

Abstract

The MAMMOS (magnetic amplifying magneto-optical system) read-out is achieved by applying an alternating external magnetic field for domain expansion and collapse processes. Since the read-out magnetic domain size is expanded by a magnetic field, a strong enhancement in the amplitude of the read-out signal is expected. The read-out laser power dependence of the MAMMOS signal was measured, and the resolution was estimated empirically. Applying an alternating magnetic field with suitable intensity, MAMMOS read-out was realized for a certain range of read-out laser power. The resolution and the margin of magnetic field depended on the laser power. Even at a 0.2 μ m domain size, its signal was recognizable without interference at the optimum laser power, A C/N level of over 50 dB was obtained for a 0.2 μ m domain size

Keywords

magnetic domains; magnetic recording noise; magneto-optical recording; 50 dB; C/N level; MAMMOS readout; alternating external magnetic field; domain expansion and collapse processes; laser power dependence; magnetic amplifying magneto-optical system; readout magnetic domain size; resolution estimation; signal quality; Laser beams; Magnetic domains; Magnetic field measurement; Magnetic fields; Magnetic separation; Magnetooptic recording; Power lasers; Signal resolution; Silicon compounds; Stimulated emission;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.706770

Filename

706770