Patent ID: 7795866

Claim:
A method for forecasting a polishing end point for forecasting and detecting a polishing end point in a case when a conductive film is polished and a predetermined conductive film is appropriately removed, wherein an inductor in an inductor type sensor is placed adjacent to the predetermined conductor film, and by the magnetic flux formed by the inductor, a change of magnetic flux induced in the predetermined conductive film is monitored, and based on the skin effect decided with the material of the predetermined conductive film during the polishing as a factor, and accompanied with the decrease of the film thickness by a progress of the polishing, the magnetic flux penetrating the predetermined conductive film increases, so that a process in which a formed eddy current increases is included, and based on the characteristic change of the magnetic flux induced in the predetermined conductive film by the eddy current, the polishing end point is forecasted.