Experimental investigation of domain expansion speeds in MAMMOS

Author

Herget, P. ; van Kesteren, H.W. ; Verschuren, C.A. ; Stancil, D.D. ; Schlesinger, T.E.

Author_Institution

Data Storage Syst. Center, Carnegie Mellon Univ., Pittsburgh, PA, USA

Volume

38

Issue

5

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

2099

Lastpage

2101

Abstract

The speeds of the domain expansion and collapse processes in a magnetic amplifying magneto-optical system (MAMMOS) recording system were experimentally measured with a high-speed photodetector. Data was collected for a range of read powers and field values, the average rise and fall times were extracted, and the delay between the field switching and the domain collapse was examined. The minimum measured expansion and collapse times were 1.6 and 4.5 ns, respectively, and the field switching to collapse delay was found to be about 20 ns with a spread of 20 ns. Theories on the expansion and collapse processes and an explanation of the delay are presented.

Keywords

magnetic domains; magnetic switching; magneto-optical recording; photodetectors; 1.6 ns; 20 ns; 4.5 ns; MAMMOS recording system; collapse delay; collapse processes; domain collapse; domain expansion speeds; expansion times; fall times; field switching; field values; high-speed photodetector; magnetic amplifying magneto-optical system; read powers; rise times; Bandwidth; Delay; Magnetic domains; Magnetic field measurement; Magnetooptic recording; Photodetectors; Signal resolution; Temperature; Timing; Velocity measurement;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.801856

Filename

1042103