Thermomagnetic switching on rare-earth transition-metal alloy magneto-optic disks

Journal Article · Tue Aug 01 04:00:00 EDT 1989 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.344425· OSTI ID:6095779

Crasemann, J H; Hansen, P; Rosenkranz, M; Witter, K

The thermomagnetic switching behavior of magneto-optic disks with amorphous TbFeCo and GdTbFe films was investigated on a test recorder. Domain length, write and erase fields, and erase laser power required for total domain erasure was studied for various film compositions, which differ in compensation temperature /ital T//sub comp/ and Curie temperature /ital T//sub /ital C//. With increasing /ital T//sub /ital C// the domain length at fixed writing laser pulse energy is reduced and the power required to erase domains with a certain size is increased. The optimum external field, for minimal write noise, decreases with increasing /ital T//sub /ital C///minus//ital T//sub comp/. The experimental dependencies agree with calculated results obtained from the force balance controlling the domain formation.

• Research Organization: Philips GmbH Forschungslaboratorium Hamburg, Vogt-Kolln-Str. 30, D-2000 Hamburg 54, Federal Republic of Germany(DE)
• OSTI ID: 6095779
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 66:3; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
AMORPHOUS STATE
COBALT ALLOYS
CURIE POINT
DOMAIN STRUCTURE
FILMS
GADOLINIUM ALLOYS
IRON ALLOYS
MAGNETIC DISKS
MAGNETIC STORAGE DEVICES
MAGNETISM
MAGNETO-OPTICAL EFFECTS
MEMORY DEVICES
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
TERBIUM ALLOYS
THERMODYNAMIC PROPERTIES
THERMOMAGNETISM
THIN FILMS
TRANSITION TEMPERATURE