Domain wall propagation in micrometric wires: Limits of single domain wall regime

Abstract

We measured magnetic domain propagation and local domain wall(DW) nucleation in Fe-Co-rich amorphous microwires with metallic nucleus diameters from 2.8 to 18 μm. We found that manipulation of magnetoelastic energy through application of applied stresses, changing of magnetostriction constant, and variation of internal stresses through changing the microwires geometry affects DW velocity. We observed uniform or uniformly accelerated DW propagation along the microwire. The abrupt increasing of DW velocity on v(H) dependencies correlates with the location of the nucleation place of the new domain wall.

Correlation of Crystalline Structure with Magnetic and Transport Properties of Glass-Coated Microwires

“…Additionally, the common way for the internal stress relaxation allowing the decreasing of the magnetoelastic anisotropy given by Equation (3) is the thermal treatment. Consequently, an enhancement of DW velocity in amorphous microwires after the internal stress relaxation is reported [71].…”

Engineering of Magnetic Properties of Magnetic Microwires

“…3 pick-up coils, mounted along the microwire and placed inside the long solenoid allowed to measure the velocity of propagating DW [18,22,23]. The electromotive force (emf ) sharp peaks from the 3 pick-up coils detected by the digital oscilloscope upon passing the propagating wall allowed estimation of the DW velocity as:…”

“…We measured the DW velocity using modified SixtusTonks-like experiments described elsewhere [18,22,23]. 3 pick-up coils, mounted along the microwire and placed inside the long solenoid allowed to measure the velocity of propagating DW [18,22,23].…”

“…Hysteresis loops have been measured using vibrating sample magnetometer VSM and fluxmetric technique described elsewhere [18,23].…”

“…In the case of cylindrical amorphous microwires exhibiting spontaneous magnetic bistability the DW speed above 1 km/s can be easily achieved [18,22,23]. Aforementioned magnetic bistability is characterized by squired hysteresis loops related to a large and single Barkhausen jump within single domain axially magnetized inner core of wire [18,22,23]. Consequently studies of single DW propagation in amorphous glass-coated microwires are quite important for understanding of the ways to enhance the DW velocity in other materials.…”