Domain wall configuration and magneto-transport properties in dual spin-valve with nanoconstriction

Abstract

We investigated the effect of external field on magneto-transport properties of synthetic antiferromagnet dual spin-valve with nanoconstriction with focus on domain wall (DW) configuration and magnetization reversal process. As magnetic field rotated from in-plane to out-of-plane along hard axis configuration, the magnetization reversal mode changed from a vortex to a transverse type, and a multistep switching process appeared due to the development of a transverse magnetization reversal mode with DW pushing towards the higher anisotropy region. The difference in the shape of nanoconstriction made an asymmetric energy barrier to the DW propagation which resulted in an asymmetry depinning field.

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“…w-Mg MTJ presented a broader domain boundary, as the magnetic field was rotated from the in-plane to the out-ofplane direction. This was likely due to the movement of the domain wall toward the higher-anisotropy region at the interface under the effects of transverse magnetization reversal from the vortex mode to the transverse mode 44 as the sweep field became perpendicular. This effect is evident in the broadening of the domains from the 60 to 120°region of w-Mg MTJ.…”