Dynamics of a Single Domain Wall Between Axial Domains in Magnetic Microwire

A new experiment is presented for studying the dynamics of a single domain wall (DW) in glass-coated microwire driven by an alternating magnetic field. Measurements of the induced voltage as a function of the frequency and as a function of the amplitude of the alternating magnetic field can be performed. It is possible to obtain a signal from the DW oscillation alone. It is also possible to apply an inhomogeneous magnetic field, which creates an artificial potential well where the wall is located, and to study the forced wall oscillations in the presence of this field. Measured dependences of the induced voltage versus alternating magnetic field amplitude for various frequencies provided amplitudes of the critical field above which the DW was no longer located in the region inside the pick-up coil. Measurements without an artificial potential well were performed to verify the validity of the DW oscillation model in a local potential well. It seems that this model does not describe the observed behavior correctly. The reason may be the high wall length to wire diameter ratio.