PR-141 AND TB-159 NMR-STUDY OF THE MAGNETIC-PROPERTIES OF RCO5+X (R=PR AND TB)

Pr-141 and Tb-159 spin-echo NMR measurements have been done on PrCo5 a nd TbCo5.1 compounds. In both compounds, domain signals have been dist inguished from domain wall signals under external fields. For TbCo5.1, the hyperfine field and electric quadrupole interaction parameter of Th obtained by NMR are in good agreement with those evaluated from the analysis of the magnetization of the compound on the basis of the cry stalline electric field (CEF) interaction including the exchange inter action between the rare earth and Co. On the contrary, Pr hyperfine fi eld of 2251 kOe in PrCo5 is much smaller than that evaluated from the CEF analysis.