Thickness-dependent magnetic domain structures of Co ultra-thin film investigated by scanning transmission X-ray microscopy

摘要

Thickness-dependent magnetic domain structure of ultrathin Co wedge films (0.3?nm–1.0?nm) sandwiched by Pt layers was investigated by scanning transmission x-ray microscopy (STXM) employing X-ray magnetic circular dichroism (XMCD), utilizing elliptically polarized soft x-rays and electromagnetic fields, with a spatial resolution of 50?nm. The magnetic domain images measured at the CoL3edge showed the evolution of the magnetic domain structures from maze-like form to the bubble-like form as the perpendicular magnetic field was applied. The asymmetric domain expansion of a 500?nm-scale bubble domain was also measured when the in-plane and perpendicular external magnetic field were applied simultaneously.