We demonstrated that the anisotropic magneto-resistance of a ferromagnetic micro-disk measured by the asymmetrically configured electrodes provide the information of the vortex chirality. The large difference of the electrical resistivity between the ferromagnetic disk and the nonmagnetic electrodes creates an inhomogeneous current distribution, allowing us to detect the local domain structure. By focusing on the chirality-dependent magneto-resistance change due to the vortex nucleation, we can clearly detect the vortex nucleation position, leading to the chirality determination. The reliability of the developed detection method has been confirmed by the magneto-resistance measurement with symmetrically configured electrodes.
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