Approach to writing-induced different types of spin vortex structure into ferromagnetic nanostripes

The control of different types of spin vortex structure in ferromagnetic nanostripes is studied by means of spin dynamics simulation. As for magnetocrystalline anisotropic nanostripe, the transformation between transverse wall and spin vortex can be realized by adjusting the strength of the uniaxial anisotropy. When nanostripe is isotropic or week anisotropic, the static magnetic structure favors spin vortex structure. Our results show that different types of spin vortex structure can be successfully induced by pinning the spins in the boundary of nanostripe. Interestingly, when the pinning is removed, the induced spin vortex structure can keep its stabilization. This approach may help to write digital information with determined spin vortex structure into ferromagnetic nanostripes. Moreover, the stability of spin vortex structure under external field is also investigated. It shows that spin vortex structure with pinned boundary spins is more stable than spin vortex in open boundary condition.

► The transformation between transverse wall and spin vortex is studied.
► An effective approach that can successfully induce the type of spin vortex is presented.
► The stability of spin vortex under external field is investigated.