Everspin Technologies, Inc.
Method of manufacturing a magnetoresistive stack/ structure using plurality of encapsulation layers

Abstract:

A method of manufacturing a magnetoresistive stack/structure comprising etching through a second magnetic region to (i) provide sidewalls of the second magnetic region and (ii) expose a surface of a dielectric layer; depositing a first encapsulation layer on the sidewalls of the second magnetic region and over the dielectric layer; etching the first encapsulation layer which is disposed over the exposed surface of the dielectric layer. The method further includes (a) depositing a second encapsulation layer: (i) on the first encapsulation layer disposed on the sidewalls of the second magnetic region and (ii) over the exposed surface of the dielectric layer and (b) depositing a third encapsulation layer: (i) on the second encapsulation layer which is on the first encapsulation layer and the exposed surface of the dielectric layer. The method also includes etching the remaining layers of the stack/structure (via one or more etch processes).