Abstract
Crystallographic examination, domain observation and the process of magnetization reversal in single crystals of Sm2Co7, SmCo5 and Sm2Co17 were studied. Nucleation field Hn in SmCo5 and Sm2Co7 varies with premagnetizing field Hex and this dependence of Hn on Hex saturates at values of Hex above 15 kOe.
Furthermore, it is found that the nucleation field Hn depends on the surface condition and the size of the single crystal sphere.
