  31^P NMR spectral features in polycrystalline SmCoPO reveal an axially
symmetric local magnetic field. At low temperature, the anisotropy of the
internal magnetic field increases rapidly, with K_ab increasing faster than
that of K_c. The dominant contribution to this anisotropy arises from Sm-4f
electron contribution over that of Co-3d. The intrinsic width 2*(Beta) deviates
from linearity with respect to bulk susceptibility below 170 K due to the
enhancement of (1/T_2)dynamic, which along with the continuous increase of
anisotropy in the internal magnetic field is responsible for the wipe out
effect of the NMR signal, well above T_C. 1/T_1 shows large anisotropy
confirming a significant contribution of Sm-4f electron spin fluctuations to
1/T_1, arising from indirect RKKY type exchange interaction indicating a
non-negligible hybridization between Sm-4f orbitals and the conduction band,
over the itinerant character of the Co-3d spins. This anisotropy in originates
from the orientation dependence of chi"(q,omega). The 3d-spin fluctuations in
the ab plane is 2D FM in nature, while along the c-axis, a signature of a weak
2D AFM spin fluctuations superimposed on weak FM spin-fluctuations even in a
field of 7 T and far above T_N is observed. The enhancement of this AFM
fluctuations of the Co-3d spins along c-axis, at further low temperature is
responsible to drive the system to an AFM ordered state.
