In this paper, we report for the first time the spontaneous formation of Zr-based metallic glass nanofilms by
developed dynamic forced-shear-rupture technique of hat-shaped specimens. The obtained nanofilms have
about 100 nm thickness and other two geometrical dimensions can reach micrometer scales. Their glassy
nature and structural stability were solidly identified. It was found that electrons with the wavelength of less
than 0.165 Å could make the metallic glass nanofilms transparent. Furthermore, it is clearly shown that shearbanding
instability still afflicts such 100-nm-thick metallic glass nanofilms.