Abstract
Understanding of domain wall (DW) propagation in a complex structure is an essential first step toward the development of any magnetic-domain based devices including spin-based logic or magnetic memristors. Interfacial Dzyaloshinskii-Moriya interaction (iDMI) in the structure with broken inversion symmetry induces an asymmetrical DW configuration with respect to the direction of in-plane field. Dynamic behaviors of field-driven DW within the film with perpendicular magnetic anisotropy is influenced by DW tilt from the iDMI effect and the corners in the T-shaped structure of the DW path. Images from Kerr microscopy reveal that the iDMI effective field contributes to a tilted structure of DW configuration and evolution along its propagation. With the combination of iDMI and T-shaped structure, we observed two distinguished bidirectional DW propagations in two output branches and distinct arriving times at the destination pads with a uniform external field. Micromagnetic simulation results is compared with the observed dynamics of a DW configuration in the structure providing an additional confirmation of the interpreted results.
Highlights
Efficient driving of magnetic domain wall (DW) in a complex structure is receiving growing attentions as it is an essential prerequisite for the development of spin-based logic or memristor devices, whose operations are based on the domain reversals and/or transportations[1,2,3]
We present the dynamic evolution of DW configuration within a 2-dimensional T-shaped microwire junction structure with the consideration of Interfacial Dzyaloshinskii-Moriya interaction (iDMI) effect
A multilayered film comprised of the FM layer sandwiched between HM layers can enhance the iDMI effect[30,31,32]
Summary
Efficient driving of magnetic domain wall (DW) in a complex structure is receiving growing attentions as it is an essential prerequisite for the development of spin-based logic or memristor devices, whose operations are based on the domain reversals and/or transportations[1,2,3]. In the applications of ultra-thin ferromagnetic films, Pt under- and/or over-layers in contact with neighboring Co layer as in the Pt/Co/Pt and Pt/Co/Ta stacks are attributed to induce the perpendicular magnetic anisotropy (PMA)[4,5,6,7,8] Another unique feature called the interfacial Dzyaloshinskii-Moriya interaction (iDMI) originated from strong spin-orbit coupling in adjacent heavy metal layer is induced in association with asymmetric layer structure around the interface. With the combined effects of the iDMI and the corner structure in the T-shaped junction, a DW proceeds along the wire structure with a tilt angle corresponding to the chirality of DW with respect to its propagation direction. The dependence of DW configuration and location in a T-shaped structure has been investigated with direct observations of DWs configuration and position by utilizing Kerr microscopy technique
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