Satellite Structure in ⁵⁹Co NMR Spectrum of Magnetically Ordered Dy_1−xY_xCo₂ Intermetallic Compound

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The magnetic environment effect of cobalt in Dy_1−xY_xCo₂ has been studied by means of bulk magnetization and ⁵⁹Co spin-echo NMR measurements at 4.2 K. Clearly resolved satellite structures of the NMR spectra have been observed. The hyperfine field distributions of ⁵⁹Co are decomposed into contributions of Co atoms in various nearest neighbor configurations of rare earth atoms. In this analysis the dipole field due to nearest neighbor rate earth moments plays an important role. The result indicates that the magnetic moment of Co in the RCo₂ cubic Laves phase pseudobinary compounds is quite sensitive to the nearest neighbor rare earth environment.