Patent ID: 7311850
Filing Date: 2007-12-25
Classification: B82Y,G11B,H01F,Y10S

Abstract:
1. A method of forming a patterned thin film, comprising the steps of: forming a film to be patterned on a base layer; forming a patterned first film on the film to be patterned, the patterned first film having a top surface and sidewalls; forming a second film over an entire surface on top of the film to be patterned and the patterned first film and on the sidewalls of the patterned first film; obtaining an etching mask from the second film formed on the film to be patterned, by removing the patterned first film; and forming a patterned thin film by selectively etching the film to be patterned, through dry etching using the etching mask, wherein the etching mask has an opening at a position where the patterned first film was present, and has end portions facing the opening, the end portions forming diagonally upward slopes, the patterned thin film has a groove at a position corresponding to the opening of the etching mask, and has end portions facing the groove, the end portions forming diagonally upward slopes, the patterned first film has an undercut.