Abstract
We studied the influence of the AC current flowing through the magnetically bistable Co-rich microwire on the magnetization dynamics. We used previously developed Sixtus-Tonks modified set-up for evaluation of the domain wall (DW) velocity within the microwire, but instead of the magnetizing solenoid we used the current flowing through the microwire. We observed that the AC current flowing though the sample produces the remagnetization of the sample by fast domain wall propagation along the microwire. Estimated DW velocity is about 4.5 km/s, being similar and even higher to that reported for the magnetic field driven domain wall propagation in Fe and Co-rich microwires. Observed current induced DW propagation through the microwire we explained considering the magnetostatic interaction between the outer circumferentially magnetized shell and the inner axially magnetized core.
Highlights
Such applications require a high level of control of domain wall (DW) propagation behaviour, which can be achieved through control of local pinning centers as well as through the manipulation of DW velocity by material properties or external stimuli
It is worth mentioning that recent studies of surface magnetization reversal performed using the magneto-optical Kerr effect (MOKE) of Co-rich microwire with induced magnetic bistability
As for the origin of observed DW propagation induced by the current flowing through the Co-rich microwire we explained it considering the magnetostatic interaction between the outer circumferentially magnetized shall an inner axially magnetized core: we assume that flowing current produces circumferential magnetic field that affects the magnetization of the circumferentially magnetized outer shell
Summary
Domain wall (DW) propagation in magnetic nano- and microwires is widely considered as one of the most attractive features suitable for potential applications related to the magnetic recording and magnetic logics.[1,2] Such applications require a high level of control of DW propagation behaviour, which can be achieved through control of local pinning centers as well as through the manipulation of DW velocity by material properties or external stimuli (magnetic field, stress. . .).Magnetic field driven DW propagation is quite traditional topic of research.[3,4] It is worth mentioning that the cylindrical amorphous microwires with positive magnetostriction coefficient presenting magnetically bistable character are characterized by quite fast DW dynamics: DW speed above 1000 m/s has been reported.[5,6]Manipulation of the magnetoelastic energy through the application of tensile stress, changing the magnetostriction constant and modifying the internal stresses significantly affected the DW dynamics in magnetically bistable microwires.[5,7]A few years the current-induced magnetic DW propagation in magnetic wires has been predicted and experimentally observed.[1,2,8]. We can assume that in Co-rich microwires presenting both GMI effect and induced magnetic bistability the magnetostatic interactions between the inner core and the outer shell can be observed too.
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