Nonreciprocal emission of spin-wave packet in FeNi film

We report a time-resolved propagating spin wave spectroscopy for Fe(19)Ni(81) film. We show that the amplitude of the spin-wave packet depends on the direction of magnetization and that its phase can be controlled by the polarity of pulsed magnetic field for the excitation. The nonreciprocal emission of spin-wave packet can be utilized for the binary spin-wave input into the spin-wave logic circuit. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3464569]