抄録
Hyperfine fields at Rh103 nuclei in the ferromagnetic Fe–Rh alloy system have been measured by the pulsed NMR technique in the concentration range between 2 and 52 at.% Rh and at temperatures between 1.4 and 470°K. In the ordered Fe65Rh35, Fe55Rh45, and Fe51Rh49 alloys, NMR spectra for Rh103 consisted of several peaks with equal spacing. From relative intensity analysis of the constituent peaks, it was determined that local distribution of Fe atoms in the second-nearest neighbors around a Rh atom is responsible for the appearance of these peaks. Temperature dependences of the resonance frequency of the main and the satellite peaks of the NMR spectra for the ordered Fe55Rh45 and Fe51Rh49 alloys have been studied. In the ferromagnetic region through a transition temperature in the ordered Fe50Rh50 and Fe48Rh52 alloys, the temperature dependence of NMR signal intensity shows a marked temperature hysteresis, while the resonance frequency changes monotonically with temperature without hysteresis.
