Patent ID: 6391216
Filing Date: 2002-05-21
Classification: B82Y,C23F,G11B,H01F

Abstract:
A method for reactive ion etching a magnetic material with a plasma of a mixed gas of carbon monoxide and a nitrogen-containing compound, said method comprising:exposing a multilayer film comprising a magnetic material thin film on a substrate and a resist film on said magnetic material thin film to an electron beam and then developing to form a pattern on said resist film; vacuum depositing a mask material; dissolving the resist to form a mask; removing the part of the magnetic thin film which is not covered by said mask by reactive ion etching with a plasma of a mixed gas of carbon monoxide and a nitrogen-containing compound to form a pattern on said magnetic material thin film and thus obtaining said magnetic material thin film which is finely worked; wherein said mask material used in said reactive ion etching comprises at least one metal selected from the group consisting of titanium, magnesium, aluminum, germanium, platinum, palladium, an alloy comprising at least one of the foregoing metals as a main component and a compound thereof.