Mossbauer absorption by soft ferromagnets in radio-frequency magnetic field

The simultaneous influence of periodical magnetic field reversals at the nucleus between the values +/-h(0) and of magnetostrictive vibrations on the shape of the Mossbauer absorption spectrum is analyzed. The effect of a constant external magnetic field is taken into account by assuming unequal durations of the states -h(0) and +h(0). It is shown that such asymmetric reversals of the magnetic field lead to splitting of the absorption lines into Zeeman patterns corresponding to the time-averaged magnetic field h(0)R, where R is the asymmetry parameter of the reversals. The calculations agree well with experiment. (C) 1997 American Institute of Physics.