Title :
Domain wall mobility measurements in magneto-optic media
Author :
Du, Mann ; Kryder, Mark H.
Author_Institution :
Dept. of Electr. & Comput. Eng., Carnegie Mellon Univ., Pittsburgh, PA, USA
fDate :
11/1/1994 12:00:00 AM
Abstract :
Domain wall motion involved in both writing and erasing processes in Magneto-Optic (MO) recording is strongly governed by domain wall mobility. This report extends our previous measurements by a highly sensitive Kerr microscope system of domain wall mobility in MO media to temperature ranges near the Curie temperature (Tc). The velocity of wall motion is measured as a function of the applied field in samples of GdTbFe and GdTbFeCo, with different compositions and compensation temperatures. The experimental temperature ranges from 60°C to 10°C below Tc. The collected data show that for samples of different composition,the domain wall mobilities increase approximately exponentially as the temperature approaches Tc from about 0.02 cm/sec-Oe to 5 cm/sec-Oe
Keywords :
Curie temperature; cobalt alloys; ferromagnetic materials; gadolinium alloys; iron alloys; magnetic domain walls; magnetic domains; magnetic multilayers; magneto-optical effects; magneto-optical recording; terbium alloys; Curie temperature; GdTbFe; GdTbFeCo; Kerr microscope system; compensation temperatures; domain wall mobility measurements; erasing processes; magneto-optic media; magneto-optic recording; wall motion velocity; writing processes; Dielectric substrates; Laser mode locking; Magnetic domain walls; Magnetic field measurement; Magnetooptic recording; Microscopy; Pulse measurements; Temperature distribution; Temperature sensors; Velocity measurement;
Journal_Title :
Magnetics, IEEE Transactions on
