Abstract: A sputtering target made of AgxMayMbz or CuxMayMbz, where x>50 at % and Ag or Cu are a first metal, Ma is a second metal and Mb is a third metal is used in a method for manufacturing data storage disks. The method of manufacture includes providing a substrate, providing a spacer layer of a material transmitting light of a selected wavelength onto a surface of the substrate, applying a first layer of a first metal alloy between the substrate and spacer layer, providing a second layer of a second metal alloy on the spacer layer, and depositing the first and second metal alloys so that one of the first and second layers is semi-transparent with respect to the light. The first and second alloys have at least one common metal provided in particular fractions of the alloys.

Abstract: A sputtering target is made of the alloy AgxMayMbz or CuxMayMbz where x>50 at % and whereby Ma stands for a second metal and Mb stands for a third metal. A method for manufacturing data storage disks using the target includes the steps of providing a substrate, providing a spacer layer of a material which is transmitting light of a selected wavelength upon a surface of the substrate, applying between the spacer layer and the substrate a first layer of a first metal alloy, providing upon the spacer layer a second layer of a second metal alloy and depositing one of the first and second metal alloys of the first and second layers respectively so that the one is semi-transparent with respect to the light. In the first and second metal alloys, at least one same metal with a fraction in each of the alloys of more than 50 at % is provided and when either of the alloys contain gold, the amount of gold is 0 to 50 at %.

Abstract: An optical data storage disk has a disk surface and a thickness and includes, in a direction from the disk surface and toward the thickness, at least two spaced-apart interfaces which are each embossed with stored information. An innermost one of the interfaces from the disk surface has a first layer which is reflective for light of a selected wavelength and at an incident angle <90°. The other has a second layer which is partially reflective and partially transmitting for light of the same selected wavelength and incident angle. All remaining material of the disk in the thickness from the disk surface to the innermost interface, substantially transmits light of the selected wavelength. The first and second layers are made of AgxMayMbz or CuxMayMbz, where x>50 at % and Ag or Cu are a first metal, Ma is a second metal and Mb is a third metal.