MAGNETIC DOMAINS OF SINGLE-DOMAIN PARTICLES OF SMCO5 OBSERVED BY THE COLLOID-SEM METHOD

Magnetic domains of ball-milled small particles of the SmCo//5 phase below several microns in size have been observed by the colloid-SEM (scanning electron microscope) method, a modified Bitter method. Domains on the c plane of single-domain particles were found when the particle size decreased. Measurements show that sizes of two single-domain particles are 2. 2 and 1. 6 mu m. These values are discussed with the theoretical critical sizes for the single-domain particles of SmCo//5.