Exchange And Crystalline Electric-Fields And Magnetization Processes In Pr2co14bandnd2co14b

The values of R-Co exchange field and crystalline electric field parameters A(nm) in the compounds Pr2Co14B and Nd2Co14B are evaluated by fitting calculations to experiments. The experiments include the magnetization curves along the crystal axes at 4.2 and 290 K and the spin reorientation temperatures for Pr2Co14B and Nd2Co14B, and also the magnetization curves along the [100] axis at a series of temperatures between 77 and 190 K for Nd2Co14B. A(nm) is nearly proportional to [r(n)], and the sign of A40 is opposite to that for R2Fe14B. A20 decreases smoothly with increase in temperature in a similar way for Pr2Co14B and Nd2Co14B. The magnetization processes of the rare-earth and the Co sublattices are analysed.