The zero-field Mn-55 nuclear magnetic resonance (NMR) spin-echo spectra are
analyzed in GdMn6Ge6 intermetallic compounds. By varying the excitation co
nditions of the NMR signal in the low-temperature flat-spiral spin structur
e of GdMn6Ge6 the anisotropy of electric and magnetic hyperfine interaction
is derived for powder samples. (C) 2001 Elsevier Science B.V. All rights r
eserved.