Thermomagnetic direct overwrite in TbFe using thermally induced domain wall energy gradient

Journal Article · Mon May 02 04:00:00 EDT 1988 · Appl. Phys. Lett.; (United States)

DOI:https://doi.org/10.1063/1.99075· OSTI ID:5279669

Rugar, D; Suits, J C; Lin, C

A method is described for thermomagnetic direct overwrite in amorphous Tb/sub 23/ Fe/sub 77/ . Using long (500 ns) laser pulses, micron-size domains can be written with diameters significantly smaller than the diameter of the Curie temperature isotherm. The relatively small domain size is due to the collapsing effect of the thermally generated domain wall energy gradient. Without switching the magnetic bias field, the domains can be collapsed to submicron size using short (50 ns) laser pulses. Domains can be completely erased by firing short pulses in succession as the recording medium is moved slowly with respect to the optical beam.

• Research Organization: IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120
• OSTI ID: 5279669
• Journal Information: Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 52:18; ISSN APPLA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
AMORPHOUS STATE
CURIE POINT
DESIGN
DOMAIN STRUCTURE
IRON ALLOYS
IRON BASE ALLOYS
MAGNETISM
MAGNETO-OPTICAL EFFECTS
MEMORY DEVICES
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
RECORDING SYSTEMS
TERBIUM ALLOYS
THERMODYNAMIC PROPERTIES
THERMOMAGNETISM
TRANSITION TEMPERATURE