Patent ID: 9660182
Date: 2017-05-23
CPC Classifications: H01J,H01L

Claim:
1. A plasma processing method of etching a multilayered material having a structure in which a first magnetic layer and a second magnetic layer are stacked with an insulating layer interposed therebetween, by using a plasma processing apparatus including a processing chamber in which a processing space for plasma generation is partitioned and formed; and a gas supply unit of supplying a processing gas into the processing space, the plasma processing method comprising: a first etching process in which the first magnetic layer is etched by supplying a first processing gas into the processing chamber and generating plasma, and the first etching process is stopped on a surface of the insulating layer; a second etching process in which a residue produced in the first etching process is removed by supplying a second processing gas into the processing chamber and generating plasma; a coating process in which a surface of the multilayered material is coated with an insulating film after the second etching process; and a third etching process in which the insulating layer and the second magnetic layer are etched by supplying a third processing gas into the processing chamber and generating plasma, after the coating process, wherein the first magnetic layer and the second magnetic layer contain CoFeB, the first processing gas contains Cl the second processing gas contains H the third processing gas contains CH the insulating layer contains MgO.