Effects of Co substitution on magnetic properties of [formula omitted] [formula omitted]

X-ray diffraction carried out on random and oriented samples of [formula omitted] [formula omitted] 0.1, 0.2, 0.3) showed that the easy magnetization direction is near the b axis for [formula omitted] 0.2, and 0.3 and is almost along the b axis for [formula omitted] Magnetic hysteresis data taken on oriented samples showed that the anisotropy field [formula omitted] varies from 12 kOe for [formula omitted] to 25 kOe for [formula omitted] at 300 K. At 10 K, [formula omitted] increases from 55 kOe for [formula omitted] to 70 kOe for [formula omitted] An indication of spin reorientation transition has been observed at ∼250 K in [formula omitted]. © 1999, American Institute of Physics. All rights reserved.