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5 9Co NMR has been studied at 4.2 K and as a function of temperature in the mixed (Nd1−xYx)2Co14B compounds throughout the full substitution range. It was found that the anisotropy of the Nd sublattice determines the canted magnetic structure of the system at 4.2 K up to the threshold Y content of 92%. Above 92% Y, the system switches rapidly to a planar structure which is enforced by the 3d sublattices. Below the threshold Y content, the system undergoes two spin reorientations with increasing temperature: a second-order phase transition from canted to uniaxial state and a first-order phase transition from uniaxial to planar structure.

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In the paper changes of neutron reflectivity of big (120 x 70 x 10 mm 3 ) Cu single crystalline monochromators and CoFe (8 %gat.) single crystalline, polarising monochromators after cold hammering of the starting plates,'are described. An almost three times higher number of reflected neutrons (totaI reflectivity) and about 20 % higher intensity in peak maximum were observed, for Cu plates (measured in reflection from (220) plane)), while the mosaic's spread was about 2 times higher than the one measured for a non-treated plate. In the case of CoFe, 3 mm thick plates, a two times higher number of reflected neutrons and almost 60 % higher intensity in peak maximum were observed (measured in transmission -from (200) plane) after hammering, whiIe the mosaic's spread increase was rather smalI (about 15 %).