Patent ID: 8425786
Filing Date: 2013-04-23
Classification: C23F,G11B,H01F,H01J,H01L

Abstract:
1. A plasma etching method for plasma etching a magnetic film containing at least one element selected from the group consisting of Fe, Co and Ni in a processing chamber using a gas containing C element and O element, the method comprising: etching the magnetic film by a time-modulated plasma; and supplying a plasma generating gas, that is different from the gas containing C element and O element, to the processing chamber during a period with high amplitude of a time-modulated antenna power, wherein a period with low amplitude of the time-modulated antenna power includes a first period, a second period, and a third period, the first period is a period in which an electron temperature relaxes, and also is a period in which the gas containing C element and O element is not supplied to the processing chamber, the second period is a period in which the gas containing C element and O element is supplied to the processing chamber, and the third period is a period in which the gas containing C element and O element is not supplied to the processing chamber.