Patent ID: 8486837

Claim:
A method for polishing a substrate having a first metal film and a second metal film, by supplying a polishing slurry for metal onto a polishing cloth of a polishing table while moving the polishing table and the substrate relatively in the state that the substrate is pressed against the polishing cloth, wherein the first metal film is one or more selected from copper, copper alloys, copper oxides, and oxides of copper alloys, and the second metal film is one or more selected from tantalum and compounds thereof, titanium and compounds thereof, and tungsten and compounds thereof, wherein the polishing slurry for metal comprises an oxidizer, a metal oxide dissolving agent, a metal inhibitor, and water, and wherein the metal inhibitor comprises: a compound having an amino-triazole skeleton wherein an amino group is bonded to carbon in a triazole ring; and a compound having an imidazole skeleton and represented by the following general formula (I): wherein R 1 , R 2 and R 3 each independently represent a hydrogen atom, an amino group, or a C 1 -C 12 alkyl chain and provided that the case that all of R 1 , R 2 and R 3 are hydrogen atoms is excluded, and wherein the substrate undergoes a first polishing process and a second polishing process; wherein the substrate is polished with a polishing slurry in the first polishing process; and then in the second polishing process the polishing slurry for metal polishes the first metal film and the second metal film so as to achieve a desired pattern.