Alternating Motion of Single-Domain Walls in Uniaxial Magnetic Wire

Alejandro Jimenez,Manuel Vazquez

doi:10.1109/lmag.2014.2353015

Abstract

Fe-Si-B microwires with strong uniaxial anisotropy reverse magnetization under homeogeneous driving magnetic field, H dr , by the nucleation at one end and propagation of a single standard domain wall, DW st , resulting in a giant Barkhausen jump between two stable remanent states with opposite magnetization. Under the additional presence of local field, H loc , a local reverse domain is nucleated, generating a pair of head-to-head and tail-to-tail injected walls, DW inj , that propagate in opposite directions. We performed designed experiments to control the motion of the DW st and DW inj under the action of both fields. The amplitude and frequency of square-shaped in-phase H dr and H loc ac fields are tuned to achieve controlled motion of the DW inj domain wall. By properly selecting the amplitude of H dr and H loc ac fields (i.e., double or multiple frequencies), we experimentally confirm the DW inj alternating motion between stable local positions/magnetic states, where H loc plays the role of a magnetic valve and H dr is the driving field.

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