Current-induced modification of spin wave mode interference

• Theoretical study on spin torque effect on spin wave mode interference.
• Demonstration of current-dependent displacement of amplitude-localized spots.
• This allows probing the spin polarization of magnetic materials.

We have studied the effect of adiabatic spin-transfer torque on mode interference of spin waves. The mode interference generates amplitude-localized spots at special positions which do not move with time. When applying current, the wavevector of spin wave is modified, resulting in current-dependent displacement of amplitude-localized spots. This current-dependent change in the mode interference may allow to probe current-induced spin wave Doppler shift in space-domain. In favorable situations, it can be used to estimate the intrinsic properties of magnetic materials such as spin polarization.