Patent ID: 9631121
Date: 2017-04-25
CPC Classifications: B24B,C09G,C23F,H01L

Claim:
1. A polishing method comprising: providing a polishing subject having a surface comprising a phase change alloy; and polishing the surface comprising the phase change alloy using a polishing composition comprising abrasive grains and at least one brittle film formation agent, wherein the at least one brittle film formation agent is selected from the group consisting of a saturated monocarboxylic acid and an organophosphorus compound, and wherein the abrasive grains have an average primary particle size of 5 to 100 nm, an average secondary particle size of not more than 150 nm, and an average degree of association, which is obtained by dividing the average secondary particle size by the average primary particle size, of 1.2 to 4, wherein the abrasive grains are colloidal silica having a surface chemically bonded with an organic acid.