FIB-APT (Focused Ion Beam - Atom Probe Tomography) refers to the site-specific specimen preparation workflow for APT using focused ion beam milling — enabling atom probe analysis of precisely targeted regions within semiconductor devices.

How Does FIB-APT Work?

• Identify: Locate the region of interest (e.g., a specific transistor) using SEM imaging.
• Lift-Out: Use FIB to cut and extract a small wedge containing the target feature.
• Annular Mill: Shape the wedge into a sharp needle (tip radius < 50 nm) using progressively lower beam currents.
• Low-kV Cleaning: Final milling at 2-5 kV to minimize FIB damage to the specimen.
• APT Analysis: Load the needle into the atom probe for 3D atomic analysis.

Why It Matters

• Site-Specific: FIB enables targeting specific device features (a single transistor, a specific interface).
• Routine Workflow: FIB lift-out + annular milling is now a routine, reproducible specimen preparation method.
• Artifact Minimization: Low-kV cleaning reduces Ga contamination and amorphous damage from FIB.

FIB-APT is surgical specimen preparation for atom-by-atom analysis — using ion beam sculpting to target and prepare specific device features for 3D atomic characterization.