We investigate an AC-driven oscillation of a domain wall in a one-dimensional clean ferromagnetic wire in order to design an effective domain wall spin torquemeter. The amplitude of the oscillation is evaluated by the collective coordinate method, and its dependence on the nonadiabatic torque constant β is clarified. We showed that the amplitude has an oscillatory component as a function of the AC amplitude. The oscillation period is inversely proportional to |β - α|, where α is the Gilbert damping constant. This result indicates that the measurement of the amplitude enables us to precisely evaluate β.
ASJC Scopus subject areas