Circular domains nucleation in magnetic microwires

摘要

We report on the nucleation of circular domains in the outer shell of magnetic, Co-rich, amorphous microwires over a wide range of magnetic field pulse frequencies and amplitudes. Nucleation in the low barrier regime of different numbers of single domains was detected using the magneto-optical Kerr effect. The amplitude and frequency dependence of the domain nucleation probability is described in the framework of a model which agrees well with the experimental data. We have shown that to efficiently drive magnetic domains in microwires with alternating electric current excitation, precise tuning of the frequency and amplitude of the pulse is necessary.