Аннотация:By means of Fe-57 Mossbauer spectroscopy and low-temperature Mn-54 nuclear orientation the local magnetization of Fe and Mn in the ferromagnetic Pt90Fe10 alloy is studied. The Mossbauer measurements in the external longitudinal magnetic field of 0.5 T and 1 T at temperature 4.2 K demonstrate that the moments of Fe atoms are ordered completely. The magnetic hyperfine field at Fe-57 is found to be 33.2 +/- 0.6 T. On the contrary, the moments of Mn impurity atoms are noncollinear with respect to the direction of the bulk magnetization in a sample, as follows from the observed temperature dependence of the effective magnetic field at Mn-54 in Pt90Fe10 matrix. The magnetic field magnitude at Mn-54 is derived from the experiment, taking into account of non-collinearity, and equals 38.4 +/- 0.6 T.