Patent Document ID: 9881766
Application ID: 15082848
Patent Status: 1

Claim One:
1. A method for performing endpointing on a sample with a charged particle beam system comprising: loading a sample into a charged particle beam system, the charged particle beam system including an ion beam and electron microscope; milling, using the ion beam, the sample to expose a first surface of the sample; forming, using the electron microscope, a first image of the first surface of the sample; milling, using the ion beam, the first surface of the sample to expose a second surface of the sample; forming, using the electron microscope, a second image of the second surface of the sample; forming a third image by subtracting the first image from the second image, the third image showing the difference made from the ion beam milling to create the second surface; and forming a fourth image by overlaying the second image over the first image, the fourth image being a differential image formed by subtracting the second image from the first image, the fourth image showing the difference made from the ion beam milling to create the second surface.