Abstract: A composite material includes a base material and polydopamine adhered to the base material. In an infrared absorption spectrum of the base material to which the polydopamine is adhered, the infrared absorption spectrum being obtained by Fourier transform infrared spectroscopy, a ratio HB/HA satisfies 0.66?HB/HA?1.1, where, in the infrared absorption spectrum, a baseline is defined as a straight line connecting a measured point obtained at 3070 cm?1 to a measured point obtained at 3700 cm?1, HA represents a perpendicular distance from a measured point obtained at 3380 cm?1 of the infrared absorption spectrum to the baseline, and HB represents a perpendicular distance from a measured point obtained at 3630 cm?1 of the infrared absorption spectrum to the baseline.

Abstract: A composite material includes a base material and polydopamine adhered to the base material, the polydopamine containing hydroxy groups. At least one hydrogen atom of the hydroxy groups is substituted with an acyl group.

Abstract: An information recording medium and a method for producing the same according to the present disclosure are configured to have an information layer in which a larger amount of light for reproduction can be obtained, so that the medium is suitable for recording information at high recording density and is useful for a multi-layer optical disc that records a large amount of contents.

Abstract: An information recording medium and a method for producing the same according to the present disclosure are configured to have an information layer in which a larger amount of light for reproduction can be obtained, so that the medium is suitable for recording information at high recording density and is useful for a multi-layer optical disc that records a large amount of contents.

Abstract: An information recording medium includes three or more information layers. The three or more information layers include a first information layer including a first dielectric film, a recording film, and a second dielectric film in this order. The first dielectric film contains an oxide of D1. The D1 represents at least one element selected from a first group consisting of Nb, Mo, Ta, W, Ti, Bi, and Ce. The recording film contains at least W, Cu, Mn, and oxygen and M. The M represents at least one element selected from a second group consisting of Nb, Mo, Ta, and Ti. The W, the Cu, the Mn, and the M except the oxygen in the recording film satisfy a following formula (1): WxCuyMnzM100-x-y-z (atom %)??(1) wherein x, y, and z satisfy 15?x?60, y?z, 0<z?40, and 60?x+y+z?98.