Observation of Mn spin canting in PtFe alloys at low temperatures

Abstract

The low-temperature nuclear orientation of 54Mn in Pt99Fe1 and Pt99.95Fe0.05 has been studied in the temperature range 12-50 mK and in the external magnetic field range 0-1.2 T. The strong temperature and external magnetic field dependence of the effective field Beff on 54Mn has been observed even in the range where the host itself is magnetically saturated. This behaviour is interpreted by noncollinearity of the Mn magnetic moments with respect to the macroscopic magnetisation direction.