Title :
Magnetic and magneto-optic properties of ordered barium ferrite films produced by rapid thermal annealing
Author :
Carey, Roy ; Gago-Sandoval, Pedro A. ; Newman, David M. ; Thomas, Bransby W J
Author_Institution :
Centre for Data Storage Mater., Coventry Univ., UK
fDate :
11/1/1993 12:00:00 AM
Abstract :
A rapid thermal annealing (RTA) process has been developed that permits the preparation of well ordered films of barium ferrite (BaFe 12O19) in minutes, rather than the hours conventionally required. Optical fluxes ≈40 W cm-2 are used to produce linear heating rates up to 20°C sec-1 and achieve final sample temperatures in excess of 750°C in less than one minute. Frequency and duty cycle modulation of the radiant optical energy allows close control of the heating cycle and the production of different RTA regimes. The magnetic and structural properties of the annealed samples have been shown to be dependent on the particular regime followed
Keywords :
Kerr magneto-optical effect; X-ray diffraction examination of materials; barium compounds; ferrites; incoherent light annealing; magnetic hysteresis; magnetic thin films; optical constants; rapid thermal processing; sputtered coatings; 400 C; 720 C; 800 C; BaFe12O19; Kerr rotation; RF magnetron sputtering; RTA process; X-ray diffraction; duty cycle modulation; frequency modulation; hysteresis loop; linear heating rates; magneto-optic properties; optical constants; optical fluxes; ordered Ba ferrite film; radiant optical energy; rapid thermal annealing; structural properties; Barium; Ferrite films; Heating; Magnetic films; Magnetic properties; Optical films; Optical modulation; Rapid thermal annealing; Rapid thermal processing; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
